diff --git a/build.gradle b/build.gradle
index b13c824..c54004c 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,9 +1,22 @@
+import javax.tools.Diagnostic
+
 plugins {
     id 'java-library'
     id 'maven-publish'
     id 'jacoco'
     alias(catalog.plugins.lombok)
     alias(catalog.plugins.sambal)
+    alias(catalog.plugins.finalguard)
+}
+
+finalGuard {
+//    defaultLevel = Diagnostic.Kind.ERROR
+    methodParameterLevel = Diagnostic.Kind.ERROR
+//    lambdaParameterLevel = Diagnostic.Kind.ERROR
+    tryWithResourceLevel = Diagnostic.Kind.ERROR
+    catchParameterLevel = Diagnostic.Kind.ERROR
+    forLoopParameterLevel = Diagnostic.Kind.ERROR
+    localVariableLevel = Diagnostic.Kind.ERROR
 }
 
 allprojects {
@@ -11,6 +24,11 @@ allprojects {
     version = getProperty('jwo.version')
 
     repositories {
+        mavenLocal {
+            content {
+                includeGroup 'net.woggioni.finalguard'
+            }
+        }
         maven {
             url = getProperty('gitea.maven.url')
         }
@@ -31,6 +49,7 @@ allprojects {
             testImplementation catalog.junit.jupiter.api
             testImplementation catalog.junit.jupiter.params
             testRuntimeOnly catalog.junit.jupiter.engine
+            testRuntimeOnly catalog.junit.platform.launcher
         }
 
         test {
diff --git a/gradle.properties b/gradle.properties
index ae7e931..b138e6f 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -3,6 +3,6 @@ org.gradle.parallel=true
 org.gradle.caching=true
 
 gitea.maven.url = https://gitea.woggioni.net/api/packages/woggioni/maven
-jwo.version = 2025.06.10
-lys.version = 2025.06.03
+jwo.version = 2025.11.19
+lys.version = 2025.11.19
 guice.version = 5.0.1
diff --git a/src/main/java/net/woggioni/jwo/Application.java b/src/main/java/net/woggioni/jwo/Application.java
index 5702537..e6fdaf2 100644
--- a/src/main/java/net/woggioni/jwo/Application.java
+++ b/src/main/java/net/woggioni/jwo/Application.java
@@ -31,11 +31,11 @@ public class Application {
     private static final String MAC_FOLDER_LIBRARY = "Library";
     private static final String MAC_FOLDER_APPLICATION_SUPPORT = "Application Support";
 
-    public static Builder builder(String name) {
+    public static Builder builder(final String name) {
         return new Builder().name(name);
     }
 
-    private static boolean validateDirectory(Path candidate, boolean writable) {
+    private static boolean validateDirectory(final Path candidate, final boolean writable) {
         try {
             if (!Files.exists(candidate)) {
                 Files.createDirectories(candidate);
@@ -51,7 +51,7 @@ public class Application {
                 log.trace("Selected existing directory '{}'", candidate);
                 return true;
             }
-        } catch (Exception ioe) {
+        } catch (final Exception ioe) {
             log.trace(
                     String.format("Directory '%s' discarded: %s", candidate.toString(), ioe.getMessage()),
                     ioe
@@ -61,7 +61,7 @@ public class Application {
     }
 
     @SneakyThrows
-    private Path selectDirectory(Stream<Path> candidates, boolean writable, String successMessage, String errorMessage) {
+    private Path selectDirectory(final Stream<Path> candidates, final boolean writable, final String successMessage, final String errorMessage) {
         return candidates
                 .filter(p -> validateDirectory(p, writable))
                 .peek(p -> log.debug(successMessage, p))
@@ -71,7 +71,7 @@ public class Application {
 
     @SneakyThrows
     public Path computeCacheDirectory() {
-        Stream<Path> commonCandidates = optional2Stream(
+        final Stream<Path> commonCandidates = optional2Stream(
                 Optional.ofNullable(cacheDirectoryPropertyKey).map(System::getProperty).map(Paths::get),
                 Optional.ofNullable(cacheDirectoryEnvVar).map(System::getenv).map(Paths::get)
         );
@@ -107,7 +107,7 @@ public class Application {
 
     @SneakyThrows
     public Path computeDataDirectory() {
-        Stream<Path> commonCandidates = optional2Stream(
+        final Stream<Path> commonCandidates = optional2Stream(
                 Optional.ofNullable(dataDirectoryPropertyKey).map(System::getProperty).map(Paths::get),
                 Optional.ofNullable(dataDirectoryEnvVar).map(System::getenv).map(Paths::get)
         );
@@ -142,8 +142,8 @@ public class Application {
     }
 
     @SneakyThrows
-    public Path computeConfigurationDirectory(boolean writable) {
-        Stream<Path> commonCandidates = optional2Stream(
+    public Path computeConfigurationDirectory(final boolean writable) {
+        final Stream<Path> commonCandidates = optional2Stream(
                 Optional.ofNullable(configurationDirectoryPropertyKey).map(System::getProperty).map(Paths::get),
                 Optional.ofNullable(configurationDirectoryEnvVar).map(System::getenv).map(Paths::get)
         );
diff --git a/src/main/java/net/woggioni/jwo/BiCon.java b/src/main/java/net/woggioni/jwo/BiCon.java
index dd966c1..b8711c7 100644
--- a/src/main/java/net/woggioni/jwo/BiCon.java
+++ b/src/main/java/net/woggioni/jwo/BiCon.java
@@ -8,9 +8,9 @@ import java.util.function.BiConsumer;
 public interface BiCon<T, U> extends BiConsumer<T, U> {
     @Override
     @SneakyThrows
-    default void accept(T t, U u) {
+    default void accept(final T t, final U u) {
         exec(t, u);
     }
 
-    void exec(T t, U u) throws Throwable;
+    void exec(final T t, final U u) throws Throwable;
 }
diff --git a/src/main/java/net/woggioni/jwo/BiFun.java b/src/main/java/net/woggioni/jwo/BiFun.java
index 5d34057..6f19266 100644
--- a/src/main/java/net/woggioni/jwo/BiFun.java
+++ b/src/main/java/net/woggioni/jwo/BiFun.java
@@ -8,9 +8,9 @@ import java.util.function.BiFunction;
 public interface BiFun<T, U, V> extends BiFunction<T, U, V> {
     @Override
     @SneakyThrows
-    default V apply(T t, U u) {
+    default V apply(final T t, final U u) {
         return exec(t, u);
     }
 
-    V exec(T t, U u) throws Throwable;
+    V exec(final T t, final U u) throws Throwable;
 }
diff --git a/src/main/java/net/woggioni/jwo/Bucket.java b/src/main/java/net/woggioni/jwo/Bucket.java
index e5c64a8..8eac20b 100644
--- a/src/main/java/net/woggioni/jwo/Bucket.java
+++ b/src/main/java/net/woggioni/jwo/Bucket.java
@@ -19,7 +19,7 @@ public interface Bucket {
      * @return false if the bucket did not contain enough token for the operation to complete,
      * true otherwise (in the latter case nTokens are actually consumed)
      */
-    default boolean removeTokens(long nTokens) {
+    default boolean removeTokens(final long nTokens) {
         return removeTokens(nTokens, System.nanoTime());
     }
 
@@ -32,7 +32,7 @@ public interface Bucket {
      * @return false if the bucket did not contain enough token for the operation to complete,
      * true otherwise (in the latter case nTokens are actually consumed)
      */
-    boolean removeTokens(long nTokens, long currentTimestamp);
+    boolean removeTokens(final long nTokens, final long currentTimestamp);
 
     /**
      * Tries to consume nTokens from the bucket, returning -1 if the operation was successful or the amount of time
@@ -44,7 +44,7 @@ public interface Bucket {
      * {@link #removeTokensWithEstimate(long)} or {@link #removeTokens(long)} invocation with the same {@param nTokens} parameter
      * will succeed
      */
-    default long removeTokensWithEstimate(long nTokens) {
+    default long removeTokensWithEstimate(final long nTokens) {
         return removeTokensWithEstimate(nTokens, System.nanoTime());
     }
 
@@ -59,13 +59,13 @@ public interface Bucket {
      * {@link #removeTokensWithEstimate(long)} or {@link #removeTokens(long)} invocation with the same {@param nTokens} parameter
      * will succeed
      */
-    long removeTokensWithEstimate(long nTokens, long currentTimestamp);
+    long removeTokensWithEstimate(final long nTokens, final long currentTimestamp);
 
-    static Bucket local(long maxCapacity, long fillAmount, Duration fillPeriod) {
+    static Bucket local(final long maxCapacity, final long fillAmount, final Duration fillPeriod) {
         return local(maxCapacity, fillAmount, fillPeriod, maxCapacity);
     }
 
-    static Bucket local(long maxCapacity, long fillAmount, Duration fillPeriod, long initialAmount) {
+    static Bucket local(final long maxCapacity, final long fillAmount, final Duration fillPeriod, final long initialAmount) {
         return new LocalBucket(maxCapacity, fillAmount, fillPeriod.toNanos(), initialAmount);
     }
 }
diff --git a/src/main/java/net/woggioni/jwo/CPU.java b/src/main/java/net/woggioni/jwo/CPU.java
index 7ec816d..c97ede5 100644
--- a/src/main/java/net/woggioni/jwo/CPU.java
+++ b/src/main/java/net/woggioni/jwo/CPU.java
@@ -13,15 +13,15 @@ public enum CPU {
 
     private final String value;
 
-    CPU(String value) {
+    CPU(final String value) {
         this.value = value;
     }
 
     public static CPU current;
 
     static {
-        String archName = System.getProperty("os.arch").toLowerCase();
-        for(CPU cpu : values()) {
+        final String archName = System.getProperty("os.arch").toLowerCase();
+        for(final CPU cpu : values()) {
             if(archName.startsWith(cpu.value)) {
                 current = cpu;
             }
diff --git a/src/main/java/net/woggioni/jwo/ChannerWriter.java b/src/main/java/net/woggioni/jwo/ChannerWriter.java
index 09e6065..0275a9e 100644
--- a/src/main/java/net/woggioni/jwo/ChannerWriter.java
+++ b/src/main/java/net/woggioni/jwo/ChannerWriter.java
@@ -15,14 +15,13 @@ public class ChannerWriter extends Writer {
 
     private final Charset charset;
 
-
     @Override
-    public void write(char[] cbuf, int off, int len) throws IOException {
+    public void write(final char[] cbuf, final int off, final int len) throws IOException {
         write(new String(cbuf, off, len));
     }
 
     @Override
-    public void write(String str) throws IOException {
+    public void write(final String str) throws IOException {
         ch.write(ByteBuffer.wrap(str.getBytes(charset)));
     }
 
@@ -34,3 +33,5 @@ public class ChannerWriter extends Writer {
         ch.close();
     }
 }
+
+
diff --git a/src/main/java/net/woggioni/jwo/Chronometer.java b/src/main/java/net/woggioni/jwo/Chronometer.java
index 9c08125..0d01891 100644
--- a/src/main/java/net/woggioni/jwo/Chronometer.java
+++ b/src/main/java/net/woggioni/jwo/Chronometer.java
@@ -18,7 +18,7 @@ public class Chronometer {
 
         public final long nanoseconds;
 
-        UnitOfMeasure(long nanoseconds) {
+        UnitOfMeasure(final long nanoseconds) {
             this.nanoseconds = nanoseconds;
         }
     }
@@ -38,7 +38,7 @@ public class Chronometer {
         return System.nanoTime() - start;
     }
 
-    public double elapsed(UnitOfMeasure unitOfMeasure) {
+    public double elapsed(final UnitOfMeasure unitOfMeasure) {
         return ((double) (System.nanoTime() - start)) / unitOfMeasure.nanoseconds;
     }
 }
diff --git a/src/main/java/net/woggioni/jwo/CircularBuffer.java b/src/main/java/net/woggioni/jwo/CircularBuffer.java
index 00cbe5c..64aeaea 100644
--- a/src/main/java/net/woggioni/jwo/CircularBuffer.java
+++ b/src/main/java/net/woggioni/jwo/CircularBuffer.java
@@ -10,7 +10,7 @@ public class CircularBuffer {
     private Reader reader;
     private int delta = 0, cursor = 0;
 
-    public CircularBuffer(Reader reader, int size) {
+    public CircularBuffer(final Reader reader, final int size) {
         this.reader = reader;
         buffer = new int[size];
     }
@@ -20,7 +20,7 @@ public class CircularBuffer {
         if (delta < 0)
             return buffer[Math.floorMod(cursor + delta++, buffer.length)];
         else {
-            int result = reader.read();
+            final int result = reader.read();
             if (result < 0) return result;
             buffer[cursor] = result;
             cursor = (cursor + 1) % buffer.length;
diff --git a/src/main/java/net/woggioni/jwo/CircularInputStream.java b/src/main/java/net/woggioni/jwo/CircularInputStream.java
index 95037f9..31106e0 100644
--- a/src/main/java/net/woggioni/jwo/CircularInputStream.java
+++ b/src/main/java/net/woggioni/jwo/CircularInputStream.java
@@ -11,7 +11,7 @@ public class CircularInputStream extends InputStream {
     int loops = 0;
     int cursor = 0;
 
-    public CircularInputStream(byte[] monomer) {
+    public CircularInputStream(final byte[] monomer) {
         this(monomer, -1);
     }
 
@@ -20,18 +20,18 @@ public class CircularInputStream extends InputStream {
         if (cursor < 0) {
             return cursor;
         } else {
-            int result = monomer[cursor];
+            final int result = monomer[cursor];
             incrementCursor();
             return result;
         }
     }
 
     @Override
-    public int read(byte[] b, int off, int len) {
+    public int read(final byte[] b, final int off, final int len) {
         int read = 0;
         while (read < len) {
             if(cursor < 0) break;
-            int toBeRead = Math.min(monomer.length - cursor, len - read);
+            final int toBeRead = Math.min(monomer.length - cursor, len - read);
             System.arraycopy(monomer, cursor, b, off + read, toBeRead);
             incrementCursor(toBeRead);
             read += toBeRead;
@@ -43,7 +43,7 @@ public class CircularInputStream extends InputStream {
         return incrementCursor(1);
     }
 
-    int incrementCursor(int increment) {
+    int incrementCursor(final int increment) {
         loops = (loops * monomer.length + increment) / monomer.length;
         if (maxLoops < 0 || loops < maxLoops) {
             cursor = (cursor + increment) % monomer.length;
diff --git a/src/main/java/net/woggioni/jwo/CollectionUtils.java b/src/main/java/net/woggioni/jwo/CollectionUtils.java
index cfc73f6..53d7201 100644
--- a/src/main/java/net/woggioni/jwo/CollectionUtils.java
+++ b/src/main/java/net/woggioni/jwo/CollectionUtils.java
@@ -30,7 +30,7 @@ public class CollectionUtils {
     }
 
     @SafeVarargs
-    public static <T> ArrayList<T> newArrayList(T... args) {
+    public static <T> ArrayList<T> newArrayList(final T... args) {
         return new ArrayList<>(Arrays.asList(args));
     }
 
@@ -46,7 +46,7 @@ public class CollectionUtils {
     }
 
     @SafeVarargs
-    public static <T> List<T> immutableList(T... elements) {
+    public static <T> List<T> immutableList(final T... elements) {
         return Stream.of(elements).collect(toUnmodifiableList());
     }
 
@@ -62,12 +62,12 @@ public class CollectionUtils {
     }
 
     @SafeVarargs
-    public static <T> Set<T> immutableSet(T... elements) {
+    public static <T> Set<T> immutableSet(final T... elements) {
         return Stream.of(elements).collect(toUnmodifiableSet());
     }
 
     private static <T> Collector<T, ?, NavigableSet<T>>
-    createTreeSetCollector(Function<NavigableSet<T>, NavigableSet<T>> finalizer, Comparator<? super T> comparator) {
+    createTreeSetCollector(final Function<NavigableSet<T>, NavigableSet<T>> finalizer, final Comparator<? super T> comparator) {
         return Collector.of(
                 () -> new TreeSet<>(comparator),
                 Set::add,
@@ -79,7 +79,7 @@ public class CollectionUtils {
     }
 
     private static <T extends Comparable<T>> Collector<T, ?, NavigableSet<T>>
-    createTreeSetCollector(Function<NavigableSet<T>, NavigableSet<T>> finalizer) {
+    createTreeSetCollector(final Function<NavigableSet<T>, NavigableSet<T>> finalizer) {
         return Collector.of(
                 TreeSet::new,
                 Set::add,
@@ -94,11 +94,11 @@ public class CollectionUtils {
         return createTreeSetCollector(Function.identity());
     }
 
-    public static <T> Collector<T, ?, NavigableSet<T>> toTreeSet(Comparator<? super T> comparator) {
+    public static <T> Collector<T, ?, NavigableSet<T>> toTreeSet(final Comparator<? super T> comparator) {
         return createTreeSetCollector(Function.identity(), comparator);
     }
 
-    public static <T> Collector<T, ?, NavigableSet<T>> toUnmodifiableTreeSet(Comparator<? super T> comparator) {
+    public static <T> Collector<T, ?, NavigableSet<T>> toUnmodifiableTreeSet(final Comparator<? super T> comparator) {
         return createTreeSetCollector(Collections::unmodifiableNavigableSet, comparator);
     }
 
@@ -107,21 +107,21 @@ public class CollectionUtils {
     }
 
     @SafeVarargs
-    public static <T> NavigableSet<T> immutableTreeSet(Comparator<? super T> comparator, T... elements) {
+    public static <T> NavigableSet<T> immutableTreeSet(final Comparator<? super T> comparator, final T... elements) {
         return Stream.of(elements).collect(toUnmodifiableTreeSet(comparator));
     }
 
     @SafeVarargs
-    public static <T extends Comparable<T>> NavigableSet<T> immutableTreeSet(T... elements) {
+    public static <T extends Comparable<T>> NavigableSet<T> immutableTreeSet(final T... elements) {
         return Stream.of(elements).collect(toUnmodifiableTreeSet());
     }
 
-    private static <K, V, M extends Map<K, V>> BinaryOperator<M> mapMerger(BinaryOperator<V> var0) {
+    private static <K, V, M extends Map<K, V>> BinaryOperator<M> mapMerger(final BinaryOperator<V> var0) {
         return (m1, m2) -> {
-            Iterator<Map.Entry<K, V>> it = m2.entrySet().iterator();
+            final Iterator<Map.Entry<K, V>> it = m2.entrySet().iterator();
 
             while (it.hasNext()) {
-                Map.Entry<K, V> entry = it.next();
+                final Map.Entry<K, V> entry = it.next();
                 m1.merge(entry.getKey(), entry.getValue(), var0);
             }
 
@@ -142,7 +142,7 @@ public class CollectionUtils {
         return (v1, v2) -> v1;
     }
 
-    private static <T> BinaryOperator<T> getMerger(MapMergeStrategy mapMergeStrategy) {
+    private static <T> BinaryOperator<T> getMerger(final MapMergeStrategy mapMergeStrategy) {
         BinaryOperator<T> result;
         switch (mapMergeStrategy) {
             case KEEP:
@@ -161,74 +161,74 @@ public class CollectionUtils {
     }
 
     public static <T, K, V> Collector<T, ?, Map<K, V>> toUnmodifiableHashMap(
-        Function<T, K> keyExtractor,
-        Function<T, V> valueExtractor,
-        MapMergeStrategy mapMergeStrategy) {
+            final Function<T, K> keyExtractor,
+            final Function<T, V> valueExtractor,
+            final MapMergeStrategy mapMergeStrategy) {
         return toUnmodifiableMap(HashMap::new, keyExtractor, valueExtractor, mapMergeStrategy);
     }
     public static <T, K, V> Collector<T, ?, Map<K, V>> toUnmodifiableHashMap(
-            Function<T, K> keyExtractor,
-            Function<T, V> valueExtractor) {
+            final Function<T, K> keyExtractor,
+            final Function<T, V> valueExtractor) {
         return toUnmodifiableMap(HashMap::new, keyExtractor, valueExtractor);
     }
 
     public static <T, K, V> Collector<T, ?, NavigableMap<K, V>> toUnmodifiableTreeMap(
-            Function<T, K> keyExtractor,
-            Function<T, V> valueExtractor) {
+            final Function<T, K> keyExtractor,
+            final Function<T, V> valueExtractor) {
         return toUnmodifiableNavigableMap(TreeMap::new, keyExtractor, valueExtractor);
     }
 
     public static <T, K, V> Collector<T, ?, NavigableMap<K, V>> toUnmodifiableTreeMap(
-        Function<T, K> keyExtractor,
-        Function<T, V> valueExtractor,
-        MapMergeStrategy mapMergeStrategy) {
+            final Function<T, K> keyExtractor,
+            final Function<T, V> valueExtractor,
+            final MapMergeStrategy mapMergeStrategy) {
         return toUnmodifiableNavigableMap(TreeMap::new, keyExtractor, valueExtractor, mapMergeStrategy);
     }
     public static <T, K, V> Collector<T, ?, NavigableMap<K, V>> toUnmodifiableTreeMap(
-        Function<T, K> keyExtractor,
-        Function<T, V> valueExtractor,
-        Comparator<K> comparator,
-        MapMergeStrategy mapMergeStrategy) {
+            final Function<T, K> keyExtractor,
+            final Function<T, V> valueExtractor,
+            final Comparator<K> comparator,
+            final MapMergeStrategy mapMergeStrategy) {
         return toUnmodifiableNavigableMap(() -> new TreeMap<>(comparator), keyExtractor, valueExtractor, mapMergeStrategy);
     }
     public static <T, K, V> Collector<T, ?, NavigableMap<K, V>> toUnmodifiableTreeMap(
-            Function<T, K> keyExtractor,
-            Function<T, V> valueExtractor,
-            Comparator<K> comparator) {
+            final Function<T, K> keyExtractor,
+            final Function<T, V> valueExtractor,
+            final Comparator<K> comparator) {
         return toUnmodifiableNavigableMap(() -> new TreeMap<>(comparator), keyExtractor, valueExtractor);
     }
 
     public static <T, K, V> Collector<T, ?, NavigableMap<K, V>> toTreeMap(
-        Function<T, K> keyExtractor,
-        Function<T, V> valueExtractor,
-        MapMergeStrategy mapMergeStrategy) {
+            final Function<T, K> keyExtractor,
+            final Function<T, V> valueExtractor,
+            final MapMergeStrategy mapMergeStrategy) {
         return toNavigableMap(TreeMap::new, keyExtractor, valueExtractor, mapMergeStrategy);
     }
     public static <T, K, V> Collector<T, ?, NavigableMap<K, V>> toTreeMap(
-            Function<T, K> keyExtractor,
-            Function<T, V> valueExtractor) {
+            final Function<T, K> keyExtractor,
+            final Function<T, V> valueExtractor) {
         return toNavigableMap(TreeMap::new, keyExtractor, valueExtractor);
     }
 
     public static <T, K, V> Collector<T, ?, NavigableMap<K, V>> toTreeMap(
-            Function<T, K> keyExtractor,
-            Function<T, V> valueExtractor,
-            Comparator<K> comparator) {
+            final Function<T, K> keyExtractor,
+            final Function<T, V> valueExtractor,
+            final Comparator<K> comparator) {
         return toNavigableMap(() -> new TreeMap<>(comparator), keyExtractor, valueExtractor);
     }
 
     public static <T, K, V> Collector<T, ?, NavigableMap<K, V>> toTreeMap(
-        Function<T, K> keyExtractor,
-        Function<T, V> valueExtractor,
-        Comparator<K> comparator,
-        MapMergeStrategy mapMergeStrategy) {
+            final Function<T, K> keyExtractor,
+            final Function<T, V> valueExtractor,
+            final Comparator<K> comparator,
+            final MapMergeStrategy mapMergeStrategy) {
         return toNavigableMap(() -> new TreeMap<>(comparator), keyExtractor, valueExtractor, mapMergeStrategy);
     }
 
     public static <T, K, V, MAP_TYPE extends NavigableMap<K, V>> Collector<T, ?, MAP_TYPE> toNavigableMap(
-        Supplier<MAP_TYPE> constructor,
-        Function<T, K> keyExtractor,
-        Function<T, V> valueExtractor) {
+            final Supplier<MAP_TYPE> constructor,
+            final Function<T, K> keyExtractor,
+            final Function<T, V> valueExtractor) {
         return toNavigableMap(
             constructor,
             keyExtractor,
@@ -238,12 +238,12 @@ public class CollectionUtils {
     }
 
     public static <T, K, V, MAP_TYPE extends NavigableMap<K, V>> Collector<T, ?, MAP_TYPE> toNavigableMap(
-            Supplier<MAP_TYPE> constructor,
-            Function<T, K> keyExtractor,
-            Function<T, V> valueExtractor,
-            MapMergeStrategy mapMergeStrategy) {
-        BinaryOperator<V> valueMerger = getMerger(mapMergeStrategy);
-        BiConsumer<MAP_TYPE, T> accumulator = (map, streamElement) -> {
+            final Supplier<MAP_TYPE> constructor,
+            final Function<T, K> keyExtractor,
+            final Function<T, V> valueExtractor,
+            final MapMergeStrategy mapMergeStrategy) {
+        final BinaryOperator<V> valueMerger = getMerger(mapMergeStrategy);
+        final BiConsumer<MAP_TYPE, T> accumulator = (map, streamElement) -> {
             map.merge(keyExtractor.apply(streamElement), valueExtractor.apply(streamElement),
                 valueMerger
             );
@@ -256,19 +256,19 @@ public class CollectionUtils {
     }
 
     public static <T, K, V> Collector<T, ?, Map<K, V>> toMap(
-        Supplier<Map<K, V>> constructor,
-        Function<T, K> keyExtractor,
-        Function<T, V> valueExtractor) {
+            final Supplier<Map<K, V>> constructor,
+            final Function<T, K> keyExtractor,
+            final Function<T, V> valueExtractor) {
         return toMap(constructor, keyExtractor, valueExtractor, MapMergeStrategy.THROW);
     }
 
     public static <T, K, V> Collector<T, ?, Map<K, V>> toMap(
-            Supplier<Map<K, V>> constructor,
-            Function<T, K> keyExtractor,
-            Function<T, V> valueExtractor,
-            MapMergeStrategy mapMergeStrategy) {
-        BinaryOperator<V> valueMerger = getMerger(mapMergeStrategy);
-        BiConsumer<Map<K, V>, T> accumulator = (map, streamElement) -> {
+            final Supplier<Map<K, V>> constructor,
+            final Function<T, K> keyExtractor,
+            final Function<T, V> valueExtractor,
+            final MapMergeStrategy mapMergeStrategy) {
+        final BinaryOperator<V> valueMerger = getMerger(mapMergeStrategy);
+        final BiConsumer<Map<K, V>, T> accumulator = (map, streamElement) -> {
             map.merge(keyExtractor.apply(streamElement), valueExtractor.apply(streamElement),
                 valueMerger
             );
@@ -281,18 +281,18 @@ public class CollectionUtils {
     }
 
     public static <T, K, V> Collector<T, ?, Map<K, V>> toUnmodifiableMap(
-        Supplier<Map<K, V>> constructor,
-        Function<T, K> keyExtractor,
-        Function<T, V> valueExtractor) {
+            final Supplier<Map<K, V>> constructor,
+            final Function<T, K> keyExtractor,
+            final Function<T, V> valueExtractor) {
         return toUnmodifiableMap(constructor, keyExtractor, valueExtractor, MapMergeStrategy.THROW);
     }
     public static <T, K, V> Collector<T, ?, Map<K, V>> toUnmodifiableMap(
-            Supplier<Map<K, V>> constructor,
-            Function<T, K> keyExtractor,
-            Function<T, V> valueExtractor,
-            MapMergeStrategy mapMergeStrategy) {
-        BinaryOperator<V> valueMerger = getMerger(mapMergeStrategy);
-        BiConsumer<Map<K, V>, T> accumulator = (map, streamElement) -> {
+            final Supplier<Map<K, V>> constructor,
+            final Function<T, K> keyExtractor,
+            final Function<T, V> valueExtractor,
+            final MapMergeStrategy mapMergeStrategy) {
+        final BinaryOperator<V> valueMerger = getMerger(mapMergeStrategy);
+        final BiConsumer<Map<K, V>, T> accumulator = (map, streamElement) -> {
             map.merge(keyExtractor.apply(streamElement),
                 valueExtractor.apply(streamElement),
                 valueMerger
@@ -307,13 +307,13 @@ public class CollectionUtils {
     }
 
     public static <T, K, V> Collector<T, ?, NavigableMap<K, V>> toUnmodifiableNavigableMap(
-        Supplier<NavigableMap<K, V>> constructor,
-        Function<T, K> keyExtractor,
-        Function<T, V> valueExtractor,
-        MapMergeStrategy mapMergeStrategy
+            final Supplier<NavigableMap<K, V>> constructor,
+            final Function<T, K> keyExtractor,
+            final Function<T, V> valueExtractor,
+            final MapMergeStrategy mapMergeStrategy
     ) {
-        BinaryOperator<V> valueMerger = getMerger(mapMergeStrategy);
-        BiConsumer<NavigableMap<K, V>, T> accumulator = (map, streamElement) -> {
+        final BinaryOperator<V> valueMerger = getMerger(mapMergeStrategy);
+        final BiConsumer<NavigableMap<K, V>, T> accumulator = (map, streamElement) -> {
             map.merge(
                 keyExtractor.apply(streamElement),
                 valueExtractor.apply(streamElement),
@@ -328,19 +328,19 @@ public class CollectionUtils {
         );
     }
     public static <T, K, V> Collector<T, ?, NavigableMap<K, V>> toUnmodifiableNavigableMap(
-            Supplier<NavigableMap<K, V>> constructor,
-            Function<T, K> keyExtractor,
-            Function<T, V> valueExtractor) {
+            final Supplier<NavigableMap<K, V>> constructor,
+            final Function<T, K> keyExtractor,
+            final Function<T, V> valueExtractor) {
         return toUnmodifiableNavigableMap(constructor, keyExtractor, valueExtractor, MapMergeStrategy.THROW);
     }
-    public static <K, V, U> Stream<Map.Entry<K, U>> mapValues(Map<K, V> map, Fun<V, U> xform) {
+    public static <K, V, U> Stream<Map.Entry<K, U>> mapValues(final Map<K, V> map, final Fun<V, U> xform) {
         return map
                 .entrySet()
                 .stream()
                 .map(entry -> new AbstractMap.SimpleEntry<>(entry.getKey(), xform.apply(entry.getValue())));
     }
 
-    public static <T> Iterator<T> reverseIterator(List<T> list) {
+    public static <T> Iterator<T> reverseIterator(final List<T> list) {
         return new Iterator<T>() {
             private final ListIterator<T> it = list.listIterator(list.size());
             @Override
@@ -355,10 +355,10 @@ public class CollectionUtils {
         };
     }
 
-    public static <T> Iterator<T> reverseIterator(NavigableSet<T> set) {
+    public static <T> Iterator<T> reverseIterator(final NavigableSet<T> set) {
         return set.descendingIterator();
     }
-    public static <K, V> Iterator<Map.Entry<K, V>> reverseIterator(NavigableMap<K, V> map) {
+    public static <K, V> Iterator<Map.Entry<K, V>> reverseIterator(final NavigableMap<K, V> map) {
         return map.descendingMap().entrySet().iterator();
     }
 }
diff --git a/src/main/java/net/woggioni/jwo/Con.java b/src/main/java/net/woggioni/jwo/Con.java
index fec8804..0227bbc 100644
--- a/src/main/java/net/woggioni/jwo/Con.java
+++ b/src/main/java/net/woggioni/jwo/Con.java
@@ -8,9 +8,9 @@ import java.util.function.Consumer;
 public interface Con<T> extends Consumer<T> {
     @Override
     @SneakyThrows
-    default void accept(T t) {
+    default void accept(final T t) {
         exec(t);
     }
 
-    void exec(T t) throws Throwable;
+    void exec(final T t) throws Throwable;
 }
diff --git a/src/main/java/net/woggioni/jwo/DelegatingMap.java b/src/main/java/net/woggioni/jwo/DelegatingMap.java
index b32db3e..95d1564 100644
--- a/src/main/java/net/woggioni/jwo/DelegatingMap.java
+++ b/src/main/java/net/woggioni/jwo/DelegatingMap.java
@@ -10,7 +10,7 @@ import static net.woggioni.jwo.JWO.streamCat;
 
 public class DelegatingMap<K,V> extends UnmodifiableDelegatingMap<K, V> {
     private final Map<K,V> thisMap;
-    public DelegatingMap(Supplier<Map<K,V>> mapFactory, List<Map<K,V>> delegates) {
+    public DelegatingMap(final Supplier<Map<K,V>> mapFactory, final List<Map<K,V>> delegates) {
         super(mapFactory, delegates);
         thisMap = mapFactory.get();
     }
@@ -27,36 +27,36 @@ public class DelegatingMap<K,V> extends UnmodifiableDelegatingMap<K, V> {
     }
 
     @Override
-    public boolean containsKey(Object key) {
+    public boolean containsKey(final Object key) {
         if(thisMap.containsKey(key)) return true;
         return super.containsKey(key);
     }
 
     @Override
-    public boolean containsValue(Object value) {
+    public boolean containsValue(final Object value) {
         if(thisMap.containsValue(value)) return true;
         return super.containsValue(value);
     }
 
     @Override
-    public V get(Object key) {
+    public V get(final Object key) {
         return Optional.ofNullable(thisMap.get(key)).orElseGet(
             () -> super.get(key)
         );
     }
 
     @Override
-    public V put(K key, V value) {
+    public V put(final K key, final V value) {
         return thisMap.put(key, value);
     }
 
     @Override
-    public V remove(Object key) {
+    public V remove(final Object key) {
         return thisMap.remove(key);
     }
 
     @Override
-    public void putAll(Map<? extends K, ? extends V> m) {
+    public void putAll(final Map<? extends K, ? extends V> m) {
         this.thisMap.putAll(m);
     }
 
diff --git a/src/main/java/net/woggioni/jwo/Fun.java b/src/main/java/net/woggioni/jwo/Fun.java
index b3a6050..7d0fe4c 100644
--- a/src/main/java/net/woggioni/jwo/Fun.java
+++ b/src/main/java/net/woggioni/jwo/Fun.java
@@ -8,9 +8,9 @@ import java.util.function.Function;
 public interface Fun<T, U> extends Function<T, U> {
     @Override
     @SneakyThrows
-    default U apply(T t) {
+    default U apply(final T t) {
         return exec(t);
     }
 
-    U exec(T t) throws Throwable;
+    U exec(final T t) throws Throwable;
 }
diff --git a/src/main/java/net/woggioni/jwo/Hash.java b/src/main/java/net/woggioni/jwo/Hash.java
index 85cf7b1..9dc4d98 100644
--- a/src/main/java/net/woggioni/jwo/Hash.java
+++ b/src/main/java/net/woggioni/jwo/Hash.java
@@ -34,11 +34,11 @@ public class Hash {
             return MessageDigest.getInstance(key);
         }
         @SneakyThrows
-        public DigestOutputStream newOutputStream(OutputStream delegate) {
+        public DigestOutputStream newOutputStream(final OutputStream delegate) {
             return new DigestOutputStream(delegate, MessageDigest.getInstance(key));
         }
         @SneakyThrows
-        public DigestInputStream newInputStream(InputStream delegate) {
+        public DigestInputStream newInputStream(final InputStream delegate) {
             return new DigestInputStream(delegate, MessageDigest.getInstance(key));
         }
     }
@@ -50,8 +50,8 @@ public class Hash {
     private final byte[] bytes;
 
     @SneakyThrows
-    public static Hash hash(Algorithm algo, InputStream is, byte[] buffer) {
-        MessageDigest md = MessageDigest.getInstance(algo.key);
+    public static Hash hash(final Algorithm algo, final InputStream is, final byte[] buffer) {
+        final MessageDigest md = MessageDigest.getInstance(algo.key);
         int read;
         while((read = is.read(buffer, 0, buffer.length)) >= 0) {
             md.update(buffer, 0, read);
@@ -60,37 +60,37 @@ public class Hash {
     }
 
     @SneakyThrows
-    public static Hash hash(Algorithm algo, InputStream is) {
+    public static Hash hash(final Algorithm algo, final InputStream is) {
         return hash(algo, is, new byte[0x1000]);
     }
 
     @SneakyThrows
-    public static Hash md5(InputStream is) {
+    public static Hash md5(final InputStream is) {
         return md5(is, new byte[0x1000]);
     }
 
     @SneakyThrows
-    public static Hash md5(InputStream is, byte[] buffer) {
+    public static Hash md5(final InputStream is, final byte[] buffer) {
         return hash(Algorithm.MD5, is, buffer);
     }
 
-    public static String md5String(InputStream is) {
+    public static String md5String(final InputStream is) {
         return bytesToHex(md5(is).bytes);
     }
 
     final private static char[] hexArray = "0123456789ABCDEF".toCharArray();
 
-    public static String bytesToHex(byte[] bytes) {
-        char[] hexChars = new char[bytes.length * 2];
+    public static String bytesToHex(final byte[] bytes) {
+        final char[] hexChars = new char[bytes.length * 2];
         for(int j = 0; j < bytes.length; j++) {
-            int v = bytes[j] & 0xFF;
+            final int v = bytes[j] & 0xFF;
             hexChars[j * 2] = hexArray[v >>> 4];
             hexChars[j * 2 + 1] = hexArray[v & 0x0F];
         }
         return new String(hexChars);
     }
 
-    private static int charToInt(char c) {
+    private static int charToInt(final char c) {
         if (c >= '0' && c <= '9') {
             return c - '0';
         } else if(c >= 'a' && c <= 'f') {
@@ -102,14 +102,14 @@ public class Hash {
         }
     }
 
-    public static byte[] hexToBytes(String hexString) {
+    public static byte[] hexToBytes(final String hexString) {
         if (hexString.length() % 2 != 0) {
             throw newThrowable(IllegalArgumentException.class, "Hex string length must be even," +
                     " string has length '%d' instead", hexString.length());
         }
-        byte[] result = new byte[hexString.length() / 2];
+        final byte[] result = new byte[hexString.length() / 2];
         for(int i = 0; i < hexString.length(); i++) {
-            int value = charToInt(hexString.charAt(i));
+            final int value = charToInt(hexString.charAt(i));
             if (i % 2 == 0) {
                 result[i / 2] += (byte) (value << 4);
             } else {
@@ -119,13 +119,13 @@ public class Hash {
         return result;
     }
 
-    public static byte[] hexToBytes2(String hexString) {
-        ByteArrayOutputStream baos = new ByteArrayOutputStream();
+    public static byte[] hexToBytes2(final String hexString) {
+        final ByteArrayOutputStream baos = new ByteArrayOutputStream();
         if (hexString.length() % 2 != 0) {
             throw newThrowable(IllegalArgumentException.class, "Hex string length must be even," +
                 " string has length '%d' instead", hexString.length());
         }
-        int lim = hexString.length() / 2;
+        final int lim = hexString.length() / 2;
         for(int i = 0; i < lim; i++) {
             int tmp = 0;
             for (int j = 0; j < 2; j++) {
diff --git a/src/main/java/net/woggioni/jwo/HttpClient.java b/src/main/java/net/woggioni/jwo/HttpClient.java
index 9fde460..704c0d7 100644
--- a/src/main/java/net/woggioni/jwo/HttpClient.java
+++ b/src/main/java/net/woggioni/jwo/HttpClient.java
@@ -45,8 +45,8 @@ public class HttpClient {
     }
 
     @SneakyThrows
-    public HttpURLConnection call(HttpRequest httpRequest) {
-        HttpURLConnection conn = (HttpURLConnection) httpRequest.url.openConnection();
+    public HttpURLConnection call(final HttpRequest httpRequest) {
+        final HttpURLConnection conn = (HttpURLConnection) httpRequest.url.openConnection();
 
         if (socketFactory != null && conn instanceof HttpsURLConnection) {
             ((HttpsURLConnection) conn).setSSLSocketFactory(socketFactory);
@@ -60,7 +60,7 @@ public class HttpClient {
                 entry.getValue()
                     .forEach(headerValue ->
                         conn.addRequestProperty(entry.getKey(), headerValue)));
-        List<HttpCookie> cookies = cookieStore.get(httpRequest.getUrl().toURI());
+        final List<HttpCookie> cookies = cookieStore.get(httpRequest.getUrl().toURI());
         if (!cookies.isEmpty()) {
             conn.setRequestProperty("Cookie",
                 cookies.stream()
@@ -74,10 +74,10 @@ public class HttpClient {
             case DELETE:
                 if (httpRequest.body != null) {
                     conn.setDoOutput(true);
-                    byte[] buffer = new byte[1024];
-                    OutputStream os = conn.getOutputStream();
+                    final byte[] buffer = new byte[1024];
+                    final OutputStream os = conn.getOutputStream();
                     while (true) {
-                        int read = httpRequest.body.read(buffer, 0, buffer.length);
+                        final int read = httpRequest.body.read(buffer, 0, buffer.length);
                         if (read < 0) break;
                         os.write(buffer, 0, read);
                     }
@@ -89,10 +89,10 @@ public class HttpClient {
                 break;
         }
         conn.getResponseCode();
-        Map<String, List<String>> headerFields = conn.getHeaderFields();
-        List<String> cookiesHeader = headerFields.get(COOKIES_HEADER);
+        final Map<String, List<String>> headerFields = conn.getHeaderFields();
+        final List<String> cookiesHeader = headerFields.get(COOKIES_HEADER);
         if (cookiesHeader != null) {
-            for (String cookie : cookiesHeader) {
+            for (final String cookie : cookiesHeader) {
                 cookieStore.add(httpRequest.url.toURI(), HttpCookie.parse(cookie).get(0));
             }
         }
@@ -109,7 +109,7 @@ public class HttpClient {
 
         public final String text;
 
-        HttpMethod(String text) {
+        HttpMethod(final String text) {
             this.text = text;
         }
     }
@@ -130,11 +130,11 @@ public class HttpClient {
 
         public final int code;
 
-        HttpStatus(int code) {
+        HttpStatus(final int code) {
             this.code = code;
         }
 
-        public static HttpStatus of(int code) {
+        public static HttpStatus of(final int code) {
             return Arrays.stream(values())
                 .filter(it -> it.code == code)
                 .findFirst()
@@ -161,7 +161,7 @@ public class HttpClient {
         @Builder.Default
         private final InputStream body = null;
 
-        public static HttpRequestBuilder builder(URL url) {
+        public static HttpRequestBuilder builder(final URL url) {
             return HttpRequest.privateBuilder().url(url);
         }
     }
diff --git a/src/main/java/net/woggioni/jwo/IntegerMath.java b/src/main/java/net/woggioni/jwo/IntegerMath.java
index 2fd66cd..34a3cdf 100644
--- a/src/main/java/net/woggioni/jwo/IntegerMath.java
+++ b/src/main/java/net/woggioni/jwo/IntegerMath.java
@@ -6,7 +6,7 @@ import lombok.NoArgsConstructor;
 @NoArgsConstructor(access = AccessLevel.PRIVATE)
 public class IntegerMath {
 
-    public static int ceilDiv(int a, int b) {
+    public static int ceilDiv(final int a, final int b) {
         if(a <= 0) throw new IllegalArgumentException("a must be positive");
         return 1 + (a - 1) / b;
     }
diff --git a/src/main/java/net/woggioni/jwo/JWO.java b/src/main/java/net/woggioni/jwo/JWO.java
index 09ef869..b8239c1 100644
--- a/src/main/java/net/woggioni/jwo/JWO.java
+++ b/src/main/java/net/woggioni/jwo/JWO.java
@@ -75,64 +75,64 @@ public class JWO {
     private static final String PROTOCOL_HANDLER = "java.protocol.handler.pkgs";
     private static final String HANDLERS_PACKAGE = "net.woggioni.jwo.url";
 
-    public static <T> Stream<T> iterable2Stream(Iterable<T> iterable) {
+    public static <T> Stream<T> iterable2Stream(final Iterable<T> iterable) {
         return StreamSupport.stream(iterable.spliterator(), false);
     }
 
-    public static <T> Stream<T> iterable2ParallelStream(Iterable<T> iterable) {
+    public static <T> Stream<T> iterable2ParallelStream(final Iterable<T> iterable) {
         return StreamSupport.stream(iterable.spliterator(), true);
     }
 
-    public static <T> Stream<T> iterator2Stream(Iterator<T> it) {
+    public static <T> Stream<T> iterator2Stream(final Iterator<T> it) {
         return iterable2Stream(() -> it);
     }
 
-    public static <T> Stream<T> iterator2ParallelStream(Iterator<T> it) {
+    public static <T> Stream<T> iterator2ParallelStream(final Iterator<T> it) {
         return iterable2ParallelStream(() -> it);
     }
 
     @SneakyThrows
-    public static void writeObject2File(Path file, Object o) {
-        try (Writer writer = new OutputStreamWriter(new FileOutputStream(file.toString()))) {
+    public static void writeObject2File(final Path file, final Object o) {
+        try (final Writer writer = new OutputStreamWriter(new FileOutputStream(file.toString()))) {
             writer.write(o.toString());
         }
     }
 
-    public static void writeObject2File(String fileName, Object o) {
+    public static void writeObject2File(final String fileName, final Object o) {
         writeObject2File(new File(fileName), o);
     }
 
     @SneakyThrows
-    public static void writeObject2File(File file, Object o) {
-        try (Writer writer = new OutputStreamWriter(new FileOutputStream(file.getPath()))) {
+    public static void writeObject2File(final File file, final Object o) {
+        try (final Writer writer = new OutputStreamWriter(new FileOutputStream(file.getPath()))) {
             writer.write(o.toString());
         }
     }
 
     @SneakyThrows
-    public static void writeBytes2File(Path file, byte[] bytes) {
-        try (OutputStream os = Files.newOutputStream(file)) {
+    public static void writeBytes2File(final Path file, final byte[] bytes) {
+        try (final OutputStream os = Files.newOutputStream(file)) {
             os.write(bytes);
         }
     }
 
     @SneakyThrows
-    public static String readFile2String(File file) {
-        StringWriter writer = new StringWriter();
-        try (Reader reader = Files.newBufferedReader(file.toPath())) {
-            char[] buffer = new char[1024];
+    public static String readFile2String(final File file) {
+        final StringWriter writer = new StringWriter();
+        try (final Reader reader = Files.newBufferedReader(file.toPath())) {
+            final char[] buffer = new char[1024];
             JWO.copy(reader, writer, buffer);
         }
         return writer.toString();
     }
 
     @SneakyThrows
-    public static String readResource2String(String classpath) {
-        StringBuilder builder = new StringBuilder();
-        try (Reader reader = new InputStreamReader(JWO.class.getResourceAsStream(classpath))) {
-            char[] buffer = new char[1024];
+    public static String readResource2String(final String classpath) {
+        final StringBuilder builder = new StringBuilder();
+        try (final Reader reader = new InputStreamReader(JWO.class.getResourceAsStream(classpath))) {
+            final char[] buffer = new char[1024];
             while (true) {
-                int read = reader.read(buffer);
+                final int read = reader.read(buffer);
                 builder.append(buffer, 0, read);
                 if (read < buffer.length) break;
             }
@@ -141,37 +141,37 @@ public class JWO {
     }
 
     @SneakyThrows
-    public static <T extends Throwable> T newThrowable(Class<T> cls) {
-        Constructor<T> constructor = cls.getDeclaredConstructor();
+    public static <T extends Throwable> T newThrowable(final Class<T> cls) {
+        final Constructor<T> constructor = cls.getDeclaredConstructor();
         constructor.setAccessible(true);
         return constructor.newInstance();
     }
 
     @SneakyThrows
-    public static <T extends Throwable> T newThrowable(Class<T> cls, String format, Object... args) {
-        Constructor<T> constructor = cls.getDeclaredConstructor(String.class);
+    public static <T extends Throwable> T newThrowable(final Class<T> cls, final String format, final Object... args) {
+        final Constructor<T> constructor = cls.getDeclaredConstructor(String.class);
         constructor.setAccessible(true);
         return constructor.newInstance(String.format(format, args));
     }
 
     @SneakyThrows
-    public static <T extends Throwable> T newThrowable(Class<T> cls, Throwable throwable, String format, Object... args) {
-        Constructor<T> constructor = cls.getConstructor(String.class, Throwable.class);
+    public static <T extends Throwable> T newThrowable(final Class<T> cls, final Throwable throwable, final String format, final Object... args) {
+        final Constructor<T> constructor = cls.getConstructor(String.class, Throwable.class);
         return constructor.newInstance(String.format(format, args), throwable);
     }
 
     @SneakyThrows
-    public static <T extends Throwable> T raise(Class<T> cls) {
+    public static <T extends Throwable> T raise(final Class<T> cls) {
         throw newThrowable(cls);
     }
 
     @SneakyThrows
-    public static <T extends Throwable> void raise(Class<T> cls, Throwable throwable, String format, Object... args) {
+    public static <T extends Throwable> void raise(final Class<T> cls, final Throwable throwable, final String format, final Object... args) {
         throw newThrowable(cls, throwable, format, args);
     }
 
     @SneakyThrows
-    public static <T extends Throwable> void raise(Class<T> cls, String format, Object... args) {
+    public static <T extends Throwable> void raise(final Class<T> cls, final String format, final Object... args) {
         throw newThrowable(cls, format, args);
     }
 
@@ -179,12 +179,12 @@ public class JWO {
     private static HostnameVerifier defaultHostnameVerifier = HttpsURLConnection.getDefaultHostnameVerifier();
 
     @SneakyThrows
-    public static void setSSLVerifyPeerHostName(boolean verify) {
+    public static void setSSLVerifyPeerHostName(final boolean verify) {
         if (verify) {
             HttpsURLConnection.setDefaultHostnameVerifier(defaultHostnameVerifier);
         } else {
-            HostnameVerifier allHostsValid = new HostnameVerifier() {
-                public boolean verify(String hostname, SSLSession session) {
+            final HostnameVerifier allHostsValid = new HostnameVerifier() {
+                public boolean verify(final String hostname, final SSLSession session) {
                     return true;
                 }
             };
@@ -193,56 +193,56 @@ public class JWO {
     }
 
     @SneakyThrows
-    public static void setSSLVerifyPeerCertificate(boolean verify) {
+    public static void setSSLVerifyPeerCertificate(final boolean verify) {
         if (verify) {
             HttpsURLConnection.setDefaultSSLSocketFactory(defaultSSLSocketFactory);
         } else {
             // Create a trust manager that does not validate certificate chains
-            TrustManager[] trustAllCerts = new TrustManager[]{
+            final TrustManager[] trustAllCerts = new TrustManager[]{
                     new X509TrustManager() {
                         public java.security.cert.X509Certificate[] getAcceptedIssuers() {
                             return null;
                         }
 
-                        public void checkClientTrusted(X509Certificate[] certs, String authType) {
+                        public void checkClientTrusted(final X509Certificate[] certs, final String authType) {
                         }
 
-                        public void checkServerTrusted(X509Certificate[] certs, String authType) {
+                        public void checkServerTrusted(final X509Certificate[] certs, final String authType) {
                         }
                     }
             };
             // Install the all-trusting trust manager
-            SSLContext sc = SSLContext.getInstance("SSL");
+            final SSLContext sc = SSLContext.getInstance("SSL");
             sc.init(null, trustAllCerts, new java.security.SecureRandom());
             HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());
         }
     }
 
-    public static <T> Predicate<T> not(Pre<T> p) {
+    public static <T> Predicate<T> not(final Pre<T> p) {
         return p.negate();
     }
 
-    public static <V, T> Stream<V> flatMap(Stream<T> stream,
-                                           Fun<? super T, Optional<? extends V>> mappingFunction) {
+    public static <V, T> Stream<V> flatMap(final Stream<T> stream,
+                                           final Fun<? super T, Optional<? extends V>> mappingFunction) {
         return stream.map(mappingFunction).filter(Optional::isPresent).map(Optional::get);
     }
 
-    public static void setSystemPropertyIfNotDefined(String key, String value) {
+    public static void setSystemPropertyIfNotDefined(final String key, final String value) {
         if (System.getProperty(key) == null) {
             System.setProperty(key, value);
         }
     }
 
-    public static String bytesToHex(byte[] bytes) {
+    public static String bytesToHex(final byte[] bytes) {
         return Hash.bytesToHex(bytes);
     }
 
-    public static byte[] hexToBytes(String hexStr) {
+    public static byte[] hexToBytes(final String hexStr) {
         return Hash.hexToBytes(hexStr);
     }
 
     @SneakyThrows
-    public static void deletePath(Path path) {
+    public static void deletePath(final Path path) {
         Files.walk(path)
                 .sorted(Comparator.reverseOrder())
                 .map(Path::toFile)
@@ -261,7 +261,7 @@ public class JWO {
      * @throws IndexOutOfBoundsException if the negativeOffset is out of range
      *                                   (negativeOffset &ge; 0 || negativeOffset &lt; -size())
      */
-    public static <T> T tail(List<T> list, int negativeOffset) {
+    public static <T> T tail(final List<T> list, final int negativeOffset) {
         return list.get(list.size() + negativeOffset);
     }
 
@@ -271,7 +271,7 @@ public class JWO {
      * @return the last element of the input list
      * @throws IndexOutOfBoundsException if the list is empty
      */
-    public static <T> T tail(List<T> list) {
+    public static <T> T tail(final List<T> list) {
         return tail(list, -1);
     }
 
@@ -285,11 +285,11 @@ public class JWO {
      * @throws IndexOutOfBoundsException     if the list is empty
      * @throws UnsupportedOperationException if the remove operation is not supported by this list
      */
-    public static <T> T pop(List<T> list) {
+    public static <T> T pop(final List<T> list) {
         return list.remove(list.size() - 1);
     }
 
-    public static <T> Stream<T> streamCat(Stream<T>... streams) {
+    public static <T> Stream<T> streamCat(final Stream<T>... streams) {
         return Stream.of(streams).flatMap(Function.identity());
     }
 
@@ -307,11 +307,11 @@ public class JWO {
      * Example: <br>
      * "This template was created by John Doe."
      */
-    public static String renderTemplate(String template, Map<String, Object> valuesMap) {
+    public static String renderTemplate(final String template, final Map<String, Object> valuesMap) {
         return renderTemplate(template, valuesMap, null);
     }
 
-    public static int indexOfWithEscape(String haystack, char needle, char escape, int begin, int end) {
+    public static int indexOfWithEscape(final String haystack, final char needle, final char escape, final int begin, int end) {
         int result = -1;
         int cursor = begin;
         if(end == 0) {
@@ -319,7 +319,7 @@ public class JWO {
         }
         int escapeCount = 0;
         while(cursor < end) {
-            char c = haystack.charAt(cursor);
+            final char c = haystack.charAt(cursor);
             if(escapeCount > 0) {
                 --escapeCount;
                 if(c == escape) {
@@ -342,11 +342,11 @@ public class JWO {
     }
 
     public static String renderTemplate(
-            String template,
-            Map<String, Object> valuesMap,
-            Map<String, Map<String, Object>> dictMap) {
-        StringBuilder sb = new StringBuilder();
-        Object absent = new Object();
+            final String template,
+            final Map<String, Object> valuesMap,
+            final Map<String, Map<String, Object>> dictMap) {
+        final StringBuilder sb = new StringBuilder();
+        final Object absent = new Object();
 
         int cursor = 0;
         while(cursor < template.length()) {
@@ -359,7 +359,7 @@ public class JWO {
                 nextPlaceHolderWithEscape = template.length();
             }
             while (cursor < nextPlaceHolderWithEscape) {
-                char ch = template.charAt(cursor);
+                final char ch = template.charAt(cursor);
                 if (nextPlaceHolder == nextPlaceHolderWithEscape || cursor != nextPlaceHolder) {
                     sb.append(ch);
                 }
@@ -370,7 +370,7 @@ public class JWO {
                 String context = null;
                 String defaultValue = null;
                 Object value;
-                int end = template.indexOf('}', cursor + 1);
+                final int end = template.indexOf('}', cursor + 1);
                 int colon;
                 if (dictMap == null)
                     colon = -1;
@@ -383,7 +383,7 @@ public class JWO {
                     value = valuesMap.getOrDefault(key, absent);
                 } else {
                     context = template.substring(cursor + 2, colon);
-                    int secondColon = indexOfWithEscape(template, ':', '\\', colon + 1, end);
+                    final int secondColon = indexOfWithEscape(template, ':', '\\', colon + 1, end);
                     if(secondColon < 0) {
                         key = template.substring(colon + 1, end);
                     } else {
@@ -420,26 +420,26 @@ public class JWO {
      * "This template was created by John Doe."
      */
     @SneakyThrows
-    public static String renderTemplate(Reader reader,
-                                        Map<String, Object> valuesMap,
-                                        Map<String, Map<String, Object>> dictMap) {
-        StringBuilder sb = new StringBuilder();
-        char[] buf = new char[1024];
+    public static String renderTemplate(final Reader reader,
+                                        final Map<String, Object> valuesMap,
+                                        final Map<String, Map<String, Object>> dictMap) {
+        final StringBuilder sb = new StringBuilder();
+        final char[] buf = new char[1024];
         int read;
         while (!((read = reader.read(buf)) < 0)) {
             sb.append(buf, 0, read);
         }
         return renderTemplate(sb.toString(), valuesMap, dictMap);
     }
-    public static String renderTemplate(Reader reader,
-                                        Map<String, Object> valuesMap) {
+    public static String renderTemplate(final Reader reader,
+                                        final Map<String, Object> valuesMap) {
         return renderTemplate(reader, valuesMap, null);
     }
 
     @SneakyThrows
-    public static String readAll(Reader reader) {
-        char[] buffer = new char[1024];
-        StringBuilder sb = new StringBuilder();
+    public static String readAll(final Reader reader) {
+        final char[] buffer = new char[1024];
+        final StringBuilder sb = new StringBuilder();
         int read;
         while (!((read = reader.read(buffer, 0, buffer.length)) < 0)) {
             sb.append(buffer, 0, read);
@@ -447,7 +447,7 @@ public class JWO {
         return sb.toString();
     }
 
-    public static <T, U extends T> Optional<U> cast(T value, Class<U> cls) {
+    public static <T, U extends T> Optional<U> cast(final T value, final Class<U> cls) {
         if (cls.isInstance(value)) {
             return Optional.of((U) value);
         } else {
@@ -455,20 +455,20 @@ public class JWO {
         }
     }
 
-    public static <T extends Enum> Map<String, T> enumReverseMap(Class<T> cls) {
+    public static <T extends Enum> Map<String, T> enumReverseMap(final Class<T> cls) {
         return Arrays.stream(cls.getEnumConstants())
                 .collect(CollectionUtils.toUnmodifiableTreeMap(Object::toString, Function.identity()));
     }
 
-    public static <T extends Enum> T enumFromString(Class<T> cls, Map<String, T> reverseMap, String value) {
-        T result = reverseMap.get(value);
+    public static <T extends Enum> T enumFromString(final Class<T> cls, final Map<String, T> reverseMap, final String value) {
+        final T result = reverseMap.get(value);
         if (result == null)
             throw newThrowable(IllegalArgumentException.class,
                     "Unknown value '%s' for enum %s", value, cls.getName());
         return result;
     }
 
-    public static Optional<Path> which(String command) {
+    public static Optional<Path> which(final String command) {
         return Stream.of(System.getenv("PATH").split(Pattern.quote(File.pathSeparator)))
                 .map(path -> Paths.get(path, command))
                 .filter(Files::exists)
@@ -476,9 +476,9 @@ public class JWO {
                 .findFirst();
     }
 
-    public static Optional<Tuple2<String, String>> splitExtension(Path file) {
-        String fileName = file.getFileName().toString();
-        int index = fileName.lastIndexOf('.');
+    public static Optional<Tuple2<String, String>> splitExtension(final Path file) {
+        final String fileName = file.getFileName().toString();
+        final int index = fileName.lastIndexOf('.');
         if (index == -1) {
             return Optional.empty();
         } else {
@@ -487,7 +487,7 @@ public class JWO {
         }
     }
 
-    public static <T, U> T dynamicCast(U obj, Class<T> cls) {
+    public static <T, U> T dynamicCast(final U obj, final Class<T> cls) {
         if(obj == null) return null;
         else if(cls.isInstance(obj)) {
             return (T) obj;
@@ -499,13 +499,13 @@ public class JWO {
 
     @SneakyThrows
     private static void computeSizeAndCrc32(
-            ZipEntry zipEntry,
-            InputStream inputStream,
-            byte[] buffer) {
-        CRC32 crc32 = new CRC32();
+            final ZipEntry zipEntry,
+            final InputStream inputStream,
+            final byte[] buffer) {
+        final CRC32 crc32 = new CRC32();
         long sz = 0L;
         while (true) {
-            int read = inputStream.read(buffer);
+            final int read = inputStream.read(buffer);
             if (read < 0) break;
             sz += read;
             crc32.update(buffer, 0, read);
@@ -516,29 +516,29 @@ public class JWO {
     }
 
     @SneakyThrows
-    public static void write2Stream(OutputStream os,
-                           InputStream inputStream,
-                           byte[] buffer) {
+    public static void write2Stream(final OutputStream os,
+                                    final InputStream inputStream,
+                                    final byte[] buffer) {
         while (true) {
-            int read = inputStream.read(buffer);
+            final int read = inputStream.read(buffer);
             if (read < 0) break;
             os.write(buffer, 0, read);
         }
     }
 
-    public static void write2Stream(OutputStream os,
-                                    InputStream inputStream) {
+    public static void write2Stream(final OutputStream os,
+                                    final InputStream inputStream) {
         write2Stream(os, inputStream, new byte[0x10000]);
     }
 
     @SneakyThrows
     public static void writeZipEntry(
-        ZipOutputStream zip,
-        Sup<InputStream> source,
-        String destinationFileName,
-        int compressionMethod,
-        byte[] buffer) {
-        ZipEntry zipEntry = new ZipEntry(destinationFileName);
+            final ZipOutputStream zip,
+            final Sup<InputStream> source,
+            final String destinationFileName,
+            final int compressionMethod,
+            final byte[] buffer) {
+        final ZipEntry zipEntry = new ZipEntry(destinationFileName);
         switch(compressionMethod) {
             case ZipEntry.STORED:
                 // A stored ZipEntry requires computing the size and CRC32 in advance
@@ -554,38 +554,38 @@ public class JWO {
         }
         zipEntry.setMethod(compressionMethod);
         zip.putNextEntry(zipEntry);
-        try(InputStream is = source.get()) {
+        try(final InputStream is = source.get()) {
             write2Stream(zip, is, buffer);
         }
         zip.closeEntry();
     }
 
     public static void writeZipEntry(
-            ZipOutputStream zip,
-            Sup<InputStream> source,
-            String destinationFileName,
-            int compressionMethod) {
+            final ZipOutputStream zip,
+            final Sup<InputStream> source,
+            final String destinationFileName,
+            final int compressionMethod) {
         writeZipEntry(zip, source, destinationFileName, compressionMethod, new byte[0x10000]);
     }
 
     public static void writeZipEntry(
-            ZipOutputStream zip,
-            Sup<InputStream> source,
-            String destinationFileName) {
+            final ZipOutputStream zip,
+            final Sup<InputStream> source,
+            final String destinationFileName) {
         writeZipEntry(zip, source, destinationFileName, ZipEntry.DEFLATED);
     }
 
     @SneakyThrows
-    public static void extractZip(Path sourceArchive, Path destinationFolder) {
-        byte[] buffer = new byte[0x10000];
+    public static void extractZip(final Path sourceArchive, final Path destinationFolder) {
+        final byte[] buffer = new byte[0x10000];
         expandZip(sourceArchive, (BiCon<ZipInputStream, ZipEntry>)
                 (ZipInputStream zipInputStream, ZipEntry zipEntry) -> {
-            Path entryPath = destinationFolder.resolve(zipEntry.getName());
+                    final Path entryPath = destinationFolder.resolve(zipEntry.getName());
             if(zipEntry.isDirectory()) {
                 Files.createDirectories(entryPath);
             } else {
                 Files.createDirectories(entryPath.getParent());
-                try(OutputStream outputStream = Files.newOutputStream(entryPath)) {
+                try(final OutputStream outputStream = Files.newOutputStream(entryPath)) {
                     copy(zipInputStream, outputStream, buffer);
                 }
             }
@@ -593,8 +593,8 @@ public class JWO {
     }
 
     @SneakyThrows
-    public static void expandZip(Path sourceArchive, BiCon<ZipInputStream, ZipEntry> consumer) {
-        try(ZipInputStream zis = new ZipInputStream(Files.newInputStream(sourceArchive))) {
+    public static void expandZip(final Path sourceArchive, final BiCon<ZipInputStream, ZipEntry> consumer) {
+        try(final ZipInputStream zis = new ZipInputStream(Files.newInputStream(sourceArchive))) {
             ZipEntry zipEntry = zis.getNextEntry();
             while (zipEntry != null) {
                 consumer.accept(zis, zipEntry);
@@ -605,7 +605,7 @@ public class JWO {
     }
 
     @SneakyThrows
-    public static void installResource(String resourceName, Path destination, Class<?> cls) {
+    public static void installResource(final String resourceName, Path destination, final Class<?> cls) {
         Path outputFile;
         if (Files.isSymbolicLink(destination)) {
             destination = destination.toRealPath();
@@ -649,37 +649,37 @@ public class JWO {
     }
 
     @SafeVarargs
-    public static <T> Stream<T> optional2Stream(Optional<T>...opts) {
+    public static <T> Stream<T> optional2Stream(final Optional<T>...opts) {
         return Arrays.stream(opts).filter(Optional::isPresent).map(Optional::get);
     }
 
-    public static <T> Stream<T> optional2Stream(Iterable<Optional<T>> opts) {
+    public static <T> Stream<T> optional2Stream(final Iterable<Optional<T>> opts) {
         return iterable2Stream(opts).filter(Optional::isPresent).map(Optional::get);
     }
-    public static <T> Stream<T> optional2Stream(Optional<T> optional) {
+    public static <T> Stream<T> optional2Stream(final Optional<T> optional) {
         return optional.map(Stream::of).orElse(Stream.empty());
     }
 
-    public static String decapitalize(String s, Locale locale) {
+    public static String decapitalize(final String s, final Locale locale) {
         if (!s.isEmpty() && !Character.isLowerCase(s.charAt(0)))
             return s.substring(0, 1).toLowerCase(locale) + s.substring(1);
         else return s;
     }
 
-    public static String decapitalize(String s) {
+    public static String decapitalize(final String s) {
         return decapitalize(s, Locale.getDefault());
     }
 
-    public static String capitalize(String s) {
+    public static String capitalize(final String s) {
         return capitalize(s, Locale.getDefault());
     }
 
-    public static String capitalize(String s, Locale locale) {
+    public static String capitalize(final String s, final Locale locale) {
         if (!s.isEmpty()) {
-            char firstChar = s.charAt(0);
+            final char firstChar = s.charAt(0);
             if (Character.isLowerCase(firstChar)) {
-                StringBuilder sb = new StringBuilder();
-                char titleChar = Character.toTitleCase(firstChar);
+                final StringBuilder sb = new StringBuilder();
+                final char titleChar = Character.toTitleCase(firstChar);
                 if (titleChar != Character.toUpperCase(firstChar)) {
                     sb.append(titleChar);
                 } else {
@@ -693,62 +693,63 @@ public class JWO {
     }
 
     @SneakyThrows
-    public static void copy(InputStream is, OutputStream os, byte[] buffer) {
+    public static void copy(final InputStream is, final OutputStream os, final byte[] buffer) {
         while(true) {
-            int read = is.read(buffer);
+            final int read = is.read(buffer);
             if(read < 0) break;
             os.write(buffer, 0, read);
         }
     }
 
-    public static void copy(InputStream is, OutputStream os, int bufferSize) {
-        byte[] buffer = new byte[bufferSize];
+    public static void copy(final InputStream is, final OutputStream os, final int bufferSize) {
+        final byte[] buffer = new byte[bufferSize];
         copy(is, os, buffer);
     }
 
-    public static void copy(InputStream is, OutputStream os) {
-        byte[] buffer = new byte[0x10000];
+    public static void copy(final InputStream is, final OutputStream os) {
+        final byte[] buffer = new byte[0x10000];
         copy(is, os, buffer);
     }
 
     @SneakyThrows
-    public static void copy(Reader reader, Writer writer, char[] buffer) {
+    public static void copy(final Reader reader, final Writer writer, final char[] buffer) {
         while (true) {
-            int read = reader.read(buffer);
+            final int read = reader.read(buffer);
             if (read < 0) break;
             writer.write(buffer, 0, read);
         }
     }
 
-    public static void copy(Reader reader, Writer writer, int bufferSize) {
-        char[] buffer = new char[bufferSize];
+    public static void copy(final Reader reader, final Writer writer, final int bufferSize) {
+        final char[] buffer = new char[bufferSize];
         copy(reader, writer, buffer);
     }
 
-    public static void copy(Reader reader, Writer writer) {
-        char[] buffer = new char[0x10000];
+    public static void copy(final Reader reader, final Writer writer) {
+        final char[] buffer = new char[0x10000];
         copy(reader, writer, buffer);
     }
 
 
     public static void waitProcess(
-            List<String> cmd,
-            Path cwd,
-            Map<String, String> env) {
+            final List<String> cmd,
+            final Path cwd,
+            final Map<String, String> env) {
         waitProcess(cmd, cwd, env, 0, null);
     }
 
     @SneakyThrows
     public static Process startProcess(
-            List<String> cmd,
-            Path cwd, Map<String, String> env) {
-        ProcessBuilder pb = new ProcessBuilder();
+            final List<String> cmd,
+            final Path cwd,
+            final Map<String, String> env) {
+        final ProcessBuilder pb = new ProcessBuilder();
         pb.command(cmd);
         pb.inheritIO();
         pb.directory(cwd.toFile());
         pb.environment().putAll(env);
         if (log.isTraceEnabled()) {
-            String cmdLineListString = '[' + cmd.stream().map(s -> '\'' + s + '\'').collect(Collectors.joining(", ")) + ']';
+            final String cmdLineListString = '[' + cmd.stream().map(s -> '\'' + s + '\'').collect(Collectors.joining(", ")) + ']';
             log.trace("Starting child java process with command line: {}", cmdLineListString);
         }
         return pb.start();
@@ -756,15 +757,15 @@ public class JWO {
 
     @SneakyThrows
     public static void waitProcess(
-            List<String> cmd,
-            Path workingDirectory,
-            Map<String, String> env,
-            long tout,
-            TimeUnit tunit) {
-        Process process = startProcess(cmd, workingDirectory, env);
+            final List<String> cmd,
+            final Path workingDirectory,
+            final Map<String, String> env,
+            final long tout,
+            final TimeUnit tunit) {
+        final Process process = startProcess(cmd, workingDirectory, env);
         int rc;
         if (tout > 0) {
-            boolean finished = process.waitFor(tout, tunit);
+            final boolean finished = process.waitFor(tout, tunit);
             if (finished)
                 rc = process.exitValue();
             else
@@ -778,7 +779,7 @@ public class JWO {
         }
     }
 
-    public static <T> Iterator<T> enumeration2Iterator(Enumeration<T> enumeration) {
+    public static <T> Iterator<T> enumeration2Iterator(final Enumeration<T> enumeration) {
         return new Iterator<T>() {
             @Override
             public boolean hasNext() {
@@ -792,26 +793,26 @@ public class JWO {
         };
     }
 
-    public static <T> Optional<T> or(Optional<T> ...opts) {
-        for(Optional<T> opt : opts) {
+    public static <T> Optional<T> or(final Optional<T> ...opts) {
+        for(final Optional<T> opt : opts) {
             if(opt.isPresent()) return opt;
         }
         return Optional.empty();
     }
 
     @SneakyThrows
-    public static String sh(String... cmdLine) {
-        ProcessBuilder pb = new ProcessBuilder();
+    public static String sh(final String... cmdLine) {
+        final ProcessBuilder pb = new ProcessBuilder();
         pb.command(cmdLine);
         pb.redirectInput(ProcessBuilder.Redirect.PIPE);
-        Process process = pb.start();
-        int rc = process.waitFor();
+        final Process process = pb.start();
+        final int rc = process.waitFor();
         if (rc == 0) {
-            try (Reader reader = new CharFilterReader(new InputStreamReader(process.getInputStream()), '\n')) {
+            try (final Reader reader = new CharFilterReader(new InputStreamReader(process.getInputStream()), '\n')) {
                 return readAll(reader);
             }
         } else {
-            try (Reader reader = new InputStreamReader(process.getErrorStream())) {
+            try (final Reader reader = new InputStreamReader(process.getErrorStream())) {
                 throw new RuntimeException(readAll(reader));
             }
         }
@@ -823,35 +824,35 @@ public class JWO {
     }
 
     @SneakyThrows
-    public static void replaceFileIfDifferent(Supplier<InputStream> inputStreamSupplier, Path destination, FileAttribute<?>... attrs) {
+    public static void replaceFileIfDifferent(final Supplier<InputStream> inputStreamSupplier, final Path destination, final FileAttribute<?>... attrs) {
         Hash hash;
-        try (InputStream inputStream = inputStreamSupplier.get()) {
+        try (final InputStream inputStream = inputStreamSupplier.get()) {
             hash = Hash.md5(inputStream);
         }
         replaceFileIfDifferent(inputStreamSupplier, destination, hash, attrs);
     }
 
-    public static void replaceFileIfDifferent(InputStream inputStream, Path destination, FileAttribute<?>... attrs) {
+    public static void replaceFileIfDifferent(final InputStream inputStream, final Path destination, final FileAttribute<?>... attrs) {
         replaceFileIfDifferent(() -> inputStream, destination, null, attrs);
     }
 
     @SneakyThrows
     private static void replaceFileIfDifferent(
-            Supplier<InputStream> inputStreamSupplier,
-            Path destination,
+            final Supplier<InputStream> inputStreamSupplier,
+            final Path destination,
             Hash newFileHash,
-            FileAttribute<?>... attrs) {
+            final FileAttribute<?>... attrs) {
         if (Files.exists(destination)) {
             Hash existingFileHash;
-            try (InputStream existingFileStream = Files.newInputStream(destination)) {
+            try (final InputStream existingFileStream = Files.newInputStream(destination)) {
                 existingFileHash = Hash.md5(existingFileStream);
             }
             if (newFileHash == null) {
-                MessageDigest md = MessageDigest.getInstance(Hash.Algorithm.MD5.name());
-                Path tmpFile = Files.createTempFile(destination.getParent(), destination.getFileName().toString(), ".tmp", attrs);
+                final MessageDigest md = MessageDigest.getInstance(Hash.Algorithm.MD5.name());
+                final Path tmpFile = Files.createTempFile(destination.getParent(), destination.getFileName().toString(), ".tmp", attrs);
                 try {
-                    try (InputStream inputStream = inputStreamSupplier.get();
-                         OutputStream outputStream = new DigestOutputStream(Files.newOutputStream(tmpFile), md)) {
+                    try (final InputStream inputStream = inputStreamSupplier.get();
+                        final OutputStream outputStream = new DigestOutputStream(Files.newOutputStream(tmpFile), md)) {
                         copy(inputStream, outputStream);
                     }
                     newFileHash = new Hash(Hash.Algorithm.MD5, md.digest());
@@ -865,9 +866,9 @@ public class JWO {
                 }
             } else {
                 if (!Objects.equals(existingFileHash, newFileHash)) {
-                    EnumSet<StandardOpenOption> opts = EnumSet.of(StandardOpenOption.CREATE, StandardOpenOption.TRUNCATE_EXISTING, StandardOpenOption.WRITE);
-                    try (InputStream inputStream = inputStreamSupplier.get();
-                         OutputStream outputStream = Channels.newOutputStream(Files.newByteChannel(destination, opts, attrs))) {
+                    final EnumSet<StandardOpenOption> opts = EnumSet.of(StandardOpenOption.CREATE, StandardOpenOption.TRUNCATE_EXISTING, StandardOpenOption.WRITE);
+                    try (final InputStream inputStream = inputStreamSupplier.get();
+                         final OutputStream outputStream = Channels.newOutputStream(Files.newByteChannel(destination, opts, attrs))) {
                         copy(inputStream, outputStream);
                     }
                     if (log.isTraceEnabled()) {
@@ -883,71 +884,71 @@ public class JWO {
             if (log.isTraceEnabled()) {
                 log.trace("Creating file '{}'", destination);
             }
-            EnumSet<StandardOpenOption> opts = EnumSet.of(StandardOpenOption.CREATE, StandardOpenOption.WRITE);
-            try (InputStream inputStream = inputStreamSupplier.get();
-                 OutputStream outputStream = Channels.newOutputStream(Files.newByteChannel(destination, opts, attrs))) {
+            final EnumSet<StandardOpenOption> opts = EnumSet.of(StandardOpenOption.CREATE, StandardOpenOption.WRITE);
+            try (final InputStream inputStream = inputStreamSupplier.get();
+                final OutputStream outputStream = Channels.newOutputStream(Files.newByteChannel(destination, opts, attrs))) {
                 copy(inputStream, outputStream);
             }
         }
     }
 
-    public static <T, U> Runnable curry(Consumer<T> original, Supplier<T> sup) {
+    public static <T, U> Runnable curry(final Consumer<T> original, final Supplier<T> sup) {
         return () -> original.accept(sup.get());
     }
 
-    public static <T> Runnable curry(Consumer<T> original, T arg) {
+    public static <T> Runnable curry(final Consumer<T> original, final T arg) {
         return () -> original.accept(arg);
     }
 
-    public static <T, U> Supplier<U> curry(Fun<T, U> original, T arg) {
+    public static <T, U> Supplier<U> curry(final Fun<T, U> original, final T arg) {
         return () -> original.apply(arg);
     }
 
-    public static <T, U, V> Fun<U, V> curry1(BiFun<T, U, V> original, T arg) {
+    public static <T, U, V> Fun<U, V> curry1(final BiFun<T, U, V> original, final T arg) {
         return u -> original.apply(arg, u);
     }
 
-    public static <T, U, V> Fun<T, V> curry2(BiFun<T, U, V> original, U arg) {
+    public static <T, U, V> Fun<T, V> curry2(final BiFun<T, U, V> original, final U arg) {
         return t -> original.apply(t, arg);
     }
 
-    public static <T, U, V> Fun<U, V> curry1(BiFun<T, U, V> original, Supplier<T> sup) {
+    public static <T, U, V> Fun<U, V> curry1(final BiFun<T, U, V> original, final Supplier<T> sup) {
         return u -> original.apply(sup.get(), u);
     }
 
-    public static <T, U, V> Fun<T, V> curry2(BiFun<T, U, V> original, Supplier<U> sup) {
+    public static <T, U, V> Fun<T, V> curry2(final BiFun<T, U, V> original, final Supplier<U> sup) {
         return t -> original.apply(t, sup.get());
     }
 
-    public static <T> Stream<T> lazyValue(Supplier<T> valueSupplier) {
+    public static <T> Stream<T> lazyValue(final Supplier<T> valueSupplier) {
         return Stream.generate(valueSupplier).limit(1);
     }
 
-    public static <T, U> Supplier<U> compose(Supplier<T> sup, Function<? super T, ? extends U> fun) {
+    public static <T, U> Supplier<U> compose(final Supplier<T> sup, final Function<? super T, ? extends U> fun) {
         return () -> fun.apply(sup.get());
     }
 
-    public static <T, U, V> Function<T, V> compose(Function<T, U> fun1, Function<U, V> fun2) {
+    public static <T, U, V> Function<T, V> compose(final Function<T, U> fun1, final Function<U, V> fun2) {
         return param -> fun2.apply(fun1.apply(param));
     }
 
-    public static <T, U> Consumer<T> compose(Function<T, U> fun, Consumer<U> con) {
+    public static <T, U> Consumer<T> compose(final Function<T, U> fun, final Consumer<U> con) {
         return param -> con.accept(fun.apply(param));
     }
 
-    public static <T, U> Predicate<T> compose(Function<T, U> fun, Predicate<U> pred) {
+    public static <T, U> Predicate<T> compose(final Function<T, U> fun, final Predicate<U> pred) {
         return param -> pred.test(fun.apply(param));
     }
 
-    public static <T> Supplier<Boolean> compose(Supplier<T> fun, Predicate<T> pred) {
+    public static <T> Supplier<Boolean> compose(final Supplier<T> fun, final Predicate<T> pred) {
         return () -> pred.test(fun.get());
     }
 
-    public static <T> Runnable compose(Supplier<T> sup, Consumer<T> con) {
+    public static <T> Runnable compose(final Supplier<T> sup, final Consumer<T> con) {
         return () -> con.accept(sup.get());
     }
 
-    public static <T> T loadService(Class<T> serviceClass) {
+    public static <T> T loadService(final Class<T> serviceClass) {
         return StreamSupport.stream(ServiceLoader.load(serviceClass).spliterator(), false)
                 .findFirst()
                 .orElseThrow(
@@ -957,27 +958,27 @@ public class JWO {
                                 serviceClass.getName()));
     }
 
-    public static <T, U, R> Optional<R> zip(Optional<T> opt1, Optional<U> opt2, BiFun<T, U, R> cb) {
+    public static <T, U, R> Optional<R> zip(final Optional<T> opt1, final Optional<U> opt2, final BiFun<T, U, R> cb) {
         if (!opt1.isPresent() || !opt2.isPresent()) return Optional.empty();
         else return Optional.ofNullable(cb.apply(opt1.get(), opt2.get()));
     }
 
 
-    public static Executor delayedExecutor(long delay, TimeUnit unit,
-                                            Executor executor) {
+    public static Executor delayedExecutor(final long delay, final TimeUnit unit,
+                                           final Executor executor) {
         if (unit == null || executor == null)
             throw new NullPointerException();
         return new DelayedExecutor(delay, unit, executor);
     }
     private static final class Delayer {
-        private static ScheduledFuture<?> delay(Runnable command, long delay,
-                                                TimeUnit unit) {
+        private static ScheduledFuture<?> delay(final Runnable command, final long delay,
+                                                final TimeUnit unit) {
             return delayer.schedule(command, delay, unit);
         }
 
         private static final class DaemonThreadFactory implements ThreadFactory {
-            public Thread newThread(Runnable r) {
-                Thread t = new Thread(r);
+            public Thread newThread(final Runnable r) {
+                final Thread t = new Thread(r);
                 t.setDaemon(true);
                 t.setName("CompletableFutureDelayScheduler");
                 return t;
@@ -996,10 +997,12 @@ public class JWO {
         final long delay;
         final TimeUnit unit;
         final Executor executor;
-        private DelayedExecutor(long delay, TimeUnit unit, Executor executor) {
+
+        private DelayedExecutor(final long delay, final TimeUnit unit, final Executor executor) {
             this.delay = delay; this.unit = unit; this.executor = executor;
         }
-        public void execute(Runnable r) {
+
+        public void execute(final Runnable r) {
             Delayer.delay(new TaskSubmitter(executor, r), delay, unit);
         }
     }
@@ -1007,14 +1010,15 @@ public class JWO {
     private static final class TaskSubmitter implements Runnable {
         final Executor executor;
         final Runnable action;
-        TaskSubmitter(Executor executor, Runnable action) {
+
+        TaskSubmitter(final Executor executor, final Runnable action) {
             this.executor = executor;
             this.action = action;
         }
         public void run() { executor.execute(action); }
     }
 
-    public static String toUnixPath(Path path) {
+    public static String toUnixPath(final Path path) {
         String result;
         if (OS.isUnix) {
             result = path.toString();
@@ -1028,7 +1032,7 @@ public class JWO {
     }
 
     public static void registerUrlProtocolHandler() {
-        String handlers = System.getProperty(PROTOCOL_HANDLER, "");
+        final String handlers = System.getProperty(PROTOCOL_HANDLER, "");
         System.setProperty(PROTOCOL_HANDLER,
             ((handlers == null || handlers.isEmpty()) ? HANDLERS_PACKAGE : handlers + "|" + HANDLERS_PACKAGE));
         resetCachedUrlHandlers();
@@ -1042,13 +1046,13 @@ public class JWO {
     private static void resetCachedUrlHandlers() {
         try {
             URL.setURLStreamHandlerFactory(null);
-        } catch (Error ex) {
+        } catch (final Error ex) {
             // Ignore
         }
     }
 
     @SneakyThrows
-    public static void deletePath(Logger log, Path path) {
+    public static void deletePath(final Logger log, final Path path) {
         if (Files.exists(path)) {
             if (log.isInfoEnabled()) {
                 log.info("Wiping '{}'", path);
@@ -1057,21 +1061,21 @@ public class JWO {
         }
     }
 
-    public static <T, U extends T> U downCast(T param) {
+    public static <T, U extends T> U downCast(final T param) {
         return (U) param;
     }
 
-    public static <T extends U, U> U upCast(T param) {
+    public static <T extends U, U> U upCast(final T param) {
         return param;
     }
 
-    public static <T, U extends T> Optional<U> asInstance(T param, Class<U> cls) {
+    public static <T, U extends T> Optional<U> asInstance(final T param, final Class<U> cls) {
         return Optional.ofNullable(param)
             .filter(cls::isInstance)
             .map(cls::cast);
     }
 
-    public static <K, V, U> Stream<Map.Entry<K, U>> mapValues(Map<K, V> map, Fun<V, U> xform) {
+    public static <K, V, U> Stream<Map.Entry<K, U>> mapValues(final Map<K, V> map, final Fun<V, U> xform) {
         return map
             .entrySet()
             .stream()
@@ -1080,14 +1084,14 @@ public class JWO {
 
     @SneakyThrows
     public static Process startJavaProcess(
-        Logger log,
-        Path javaHome,
-        List<String> args,
-        Path cwd,
-        Map<String, String> env) {
-        Path javaExecutable = javaHome.resolve("bin/java" + (OS.isWindows ? ".exe" : ""));
-        ProcessBuilder pb = new ProcessBuilder();
-        List<String> cmd = new ArrayList<>();
+            final Logger log,
+            final Path javaHome,
+            final List<String> args,
+            final Path cwd,
+            final Map<String, String> env) {
+        final Path javaExecutable = javaHome.resolve("bin/java" + (OS.isWindows ? ".exe" : ""));
+        final ProcessBuilder pb = new ProcessBuilder();
+        final List<String> cmd = new ArrayList<>();
         cmd.add(javaExecutable.toString());
         cmd.addAll(args);
         pb.command(cmd);
@@ -1095,17 +1099,17 @@ public class JWO {
         pb.directory(cwd.toFile());
         pb.environment().putAll(env);
         if (log.isTraceEnabled()) {
-            String cmdLineListString = '[' + cmd.stream().map(s -> '\'' + s + '\'').collect(Collectors.joining(", ")) + ']';
+            final String cmdLineListString = '[' + cmd.stream().map(s -> '\'' + s + '\'').collect(Collectors.joining(", ")) + ']';
             log.trace("Starting child java process with command line: {}", cmdLineListString);
         }
         return pb.start();
     }
 
-    public static <T, U> U let(T object, Function<T, U> cb) {
+    public static <T, U> U let(final T object, final Function<T, U> cb) {
         return cb.apply(object);
     }
 
-    public static <T> T also(T object, Consumer<T> cb) {
+    public static <T> T also(final T object, final Consumer<T> cb) {
         cb.accept(object);
         return object;
     }
diff --git a/src/main/java/net/woggioni/jwo/JarExtractorInputStream.java b/src/main/java/net/woggioni/jwo/JarExtractorInputStream.java
index d1c4ae9..5579dc6 100644
--- a/src/main/java/net/woggioni/jwo/JarExtractorInputStream.java
+++ b/src/main/java/net/woggioni/jwo/JarExtractorInputStream.java
@@ -18,16 +18,16 @@ public class JarExtractorInputStream extends JarInputStream {
     private final Path destination;
     private OutputStream currentFile = null;
 
-    public JarExtractorInputStream(InputStream source,
-                                   Path destination,
-                                   boolean verify,
-                                   String sourceLocation) throws IOException {
+    public JarExtractorInputStream(final InputStream source,
+                                   final Path destination,
+                                   final boolean verify,
+                                   final String sourceLocation) throws IOException {
         super(source, verify);
         this.destination = destination;
-        Path newFileSystemLocation = destination.resolve(JarFile.MANIFEST_NAME);
+        final Path newFileSystemLocation = destination.resolve(JarFile.MANIFEST_NAME);
         Files.createDirectories(newFileSystemLocation.getParent());
-        try(OutputStream outputStream = Files.newOutputStream(newFileSystemLocation)) {
-            Manifest manifest = getManifest();
+        try(final OutputStream outputStream = Files.newOutputStream(newFileSystemLocation)) {
+            final Manifest manifest = getManifest();
             if(manifest == null) {
                 String location;
                 if(sourceLocation == null) {
@@ -44,9 +44,9 @@ public class JarExtractorInputStream extends JarInputStream {
 
     @Override
     public ZipEntry getNextEntry() throws IOException {
-        ZipEntry entry = super.getNextEntry();
+        final ZipEntry entry = super.getNextEntry();
         if(entry != null) {
-            Path newFileSystemLocation = destination.resolve(entry.getName());
+            final Path newFileSystemLocation = destination.resolve(entry.getName());
             if(entry.isDirectory()) {
                 Files.createDirectories(newFileSystemLocation);
             } else {
@@ -59,14 +59,14 @@ public class JarExtractorInputStream extends JarInputStream {
 
     @Override
     public int read() throws IOException {
-        int result = super.read();
+        final int result = super.read();
         if(result != -1 && currentFile != null) currentFile.write(result);
         return result;
     }
 
     @Override
-    public int read(byte[] b, int off, int len) throws IOException {
-        int read = super.read(b, off, len);
+    public int read(final byte[] b, final int off, final int len) throws IOException {
+        final int read = super.read(b, off, len);
         if(read != -1 && currentFile != null) currentFile.write(b, off, read);
         return read;
     }
diff --git a/src/main/java/net/woggioni/jwo/JavaProcessBuilder.java b/src/main/java/net/woggioni/jwo/JavaProcessBuilder.java
index c181e02..05b1b72 100644
--- a/src/main/java/net/woggioni/jwo/JavaProcessBuilder.java
+++ b/src/main/java/net/woggioni/jwo/JavaProcessBuilder.java
@@ -65,11 +65,11 @@ public class JavaProcessBuilder {
      * @param strings list of command line arguments to be passed to the spawned JVM
      * @return the Java argument file content as a string
      */
-    static String generateArgumentFileString(List<String> strings) {
-        StringBuilder sb = new StringBuilder();
+    static String generateArgumentFileString(final List<String> strings) {
+        final StringBuilder sb = new StringBuilder();
         int i = 0;
         while(i < strings.size()) {
-            CharacterIterator it = new StringCharacterIterator(strings.get(i));
+            final CharacterIterator it = new StringCharacterIterator(strings.get(i));
             sb.append('"');
             for (char c = it.first(); c != CharacterIterator.DONE; c = it.next()) {
                 switch (c) {
@@ -103,20 +103,20 @@ public class JavaProcessBuilder {
 
     @SneakyThrows
     public ProcessBuilder build() {
-        ArrayList<String> cmd = new ArrayList<>();
-        Path javaBin = Paths.get(javaHome, "bin", "java");
+        final ArrayList<String> cmd = new ArrayList<>();
+        final Path javaBin = Paths.get(javaHome, "bin", "java");
         cmd.add(javaBin.toString());
         cmd.addAll(jvmArgs);
         if(!classpath.isEmpty()) {
             cmd.add("-cp");
             cmd.add(String.join(PATH_SEPARATOR, classpath));
         }
-        for(Map.Entry<Object, Object> entry : properties.entrySet()) {
+        for(final Map.Entry<Object, Object> entry : properties.entrySet()) {
             cmd.add(String.format("-D%s=%s", entry.getKey(), entry.getValue()));
         }
-        for(JavaAgent javaAgent : javaAgents) {
-            StringBuilder sb = new StringBuilder("-javaagent:").append(javaAgent.jar.toString());
-            String agentArguments = javaAgent.args;
+        for(final JavaAgent javaAgent : javaAgents) {
+            final StringBuilder sb = new StringBuilder("-javaagent:").append(javaAgent.jar.toString());
+            final String agentArguments = javaAgent.args;
             if(agentArguments != null) {
                 sb.append('=');
                 sb.append(agentArguments);
@@ -135,7 +135,7 @@ public class JavaProcessBuilder {
         cmd.addAll(cliArgs);
 
         int cmdLength = 0;
-        for(String part : cmd) {
+        for(final String part : cmd) {
             cmdLength += part.length();
         }
         //Add space between arguments
@@ -145,20 +145,20 @@ public class JavaProcessBuilder {
             log.debug("Spawning new process with command line: [{}]",
                     cmd.stream().map(s -> "\"" + s + "\"").collect(Collectors.joining(", ")));
         }
-        int jvmVersion = Integer.parseInt(System.getProperty("java.vm.specification.version"));
+        final int jvmVersion = Integer.parseInt(System.getProperty("java.vm.specification.version"));
         if(jvmVersion < 9 /* Java versions 8 and earlier do not support argument files */ || cmdLength < COMMAND_LINE_MAX_SIZE || cmd.size() == 1) {
             return new ProcessBuilder(cmd);
         } else {
-            Path argumentFile = Files.createTempFile(PROCESS_BUILDER_PREFIX, ".arg");
+            final Path argumentFile = Files.createTempFile(PROCESS_BUILDER_PREFIX, ".arg");
             Runtime.getRuntime().addShutdownHook(new Thread(() -> {
                 try {
                     Files.delete(argumentFile);
-                } catch (IOException ioe) {
+                } catch (final IOException ioe) {
                     ioe.printStackTrace();
                 }
             }));
             log.trace("Using Java argument file '{}'", argumentFile);
-            try(Writer writer = Files.newBufferedWriter(argumentFile)) {
+            try(final Writer writer = Files.newBufferedWriter(argumentFile)) {
                 writer.write(generateArgumentFileString(cmd.subList(1, cmd.size())));
             }
             return new ProcessBuilder(cmd.get(0), "@" + argumentFile);
diff --git a/src/main/java/net/woggioni/jwo/JavaVersion.java b/src/main/java/net/woggioni/jwo/JavaVersion.java
index 4e39ad6..c77780d 100644
--- a/src/main/java/net/woggioni/jwo/JavaVersion.java
+++ b/src/main/java/net/woggioni/jwo/JavaVersion.java
@@ -101,7 +101,7 @@ public enum JavaVersion {
      * @return The version, or null if the provided value is null.
      * @throws IllegalArgumentException when the provided value cannot be converted.
      */
-    public static JavaVersion toVersion(Object value) throws IllegalArgumentException {
+    public static JavaVersion toVersion(final Object value) throws IllegalArgumentException {
         if (value == null) {
             return null;
         }
@@ -112,12 +112,12 @@ public enum JavaVersion {
             return getVersionForMajor((Integer) value);
         }
 
-        String name = value.toString();
+        final String name = value.toString();
 
-        int firstNonVersionCharIndex = findFirstNonVersionCharIndex(name);
+        final int firstNonVersionCharIndex = findFirstNonVersionCharIndex(name);
 
-        String[] versionStrings = name.substring(0, firstNonVersionCharIndex).split("\\.");
-        List<Integer> versions = convertToNumber(name, versionStrings);
+        final String[] versionStrings = name.substring(0, firstNonVersionCharIndex).split("\\.");
+        final List<Integer> versions = convertToNumber(name, versionStrings);
 
         if (isLegacyVersion(versions)) {
             assertTrue(name, versions.get(1) > 0);
@@ -140,11 +140,11 @@ public enum JavaVersion {
         currentJavaVersion = null;
     }
 
-    public static JavaVersion forClassVersion(int classVersion) {
+    public static JavaVersion forClassVersion(final int classVersion) {
         return getVersionForMajor(classVersion - 44); //class file versions: 1.1 == 45, 1.2 == 46...
     }
 
-    public static JavaVersion forClass(byte[] classData) {
+    public static JavaVersion forClass(final byte[] classData) {
         if (classData.length < 8) {
             throw new IllegalArgumentException("Invalid class format. Should contain at least 8 bytes");
         }
@@ -156,7 +156,7 @@ public enum JavaVersion {
      *
      * @since 6.0
      */
-    public boolean isCompatibleWith(JavaVersion otherVersion) {
+    public boolean isCompatibleWith(final JavaVersion otherVersion) {
         return this.compareTo(otherVersion) >= 0;
     }
 
@@ -169,27 +169,27 @@ public enum JavaVersion {
         return String.valueOf(ordinal() + 1);
     }
 
-    private static JavaVersion getVersionForMajor(int major) {
+    private static JavaVersion getVersionForMajor(final int major) {
         return major >= values().length ? JavaVersion.VERSION_HIGHER : values()[major - 1];
     }
 
-    private static void assertTrue(String value, boolean condition) {
+    private static void assertTrue(final String value, final boolean condition) {
         if (!condition) {
             throw new IllegalArgumentException("Could not determine java version from '" + value + "'.");
         }
     }
 
-    private static boolean isLegacyVersion(List<Integer> versions) {
+    private static boolean isLegacyVersion(final List<Integer> versions) {
         return 1 == versions.get(0) && versions.size() > 1;
     }
 
-    private static List<Integer> convertToNumber(String value, String[] versionStrs) {
-        List<Integer> result = new ArrayList<>();
-        for (String s : versionStrs) {
+    private static List<Integer> convertToNumber(final String value, final String[] versionStrs) {
+        final List<Integer> result = new ArrayList<>();
+        for (final String s : versionStrs) {
             assertTrue(value, !isNumberStartingWithZero(s));
             try {
                 result.add(Integer.parseInt(s));
-            } catch (NumberFormatException e) {
+            } catch (final NumberFormatException e) {
                 assertTrue(value, false);
             }
         }
@@ -197,11 +197,11 @@ public enum JavaVersion {
         return result;
     }
 
-    private static boolean isNumberStartingWithZero(String number) {
+    private static boolean isNumberStartingWithZero(final String number) {
         return number.length() > 1 && number.startsWith("0");
     }
 
-    private static int findFirstNonVersionCharIndex(String s) {
+    private static int findFirstNonVersionCharIndex(final String s) {
         assertTrue(s, s.length() != 0);
 
         for (int i = 0; i < s.length(); ++i) {
@@ -214,7 +214,7 @@ public enum JavaVersion {
         return s.length();
     }
 
-    private static boolean isDigitOrPeriod(char c) {
+    private static boolean isDigitOrPeriod(final char c) {
         return (c >= '0' && c <= '9') || c == '.';
     }
 }
\ No newline at end of file
diff --git a/src/main/java/net/woggioni/jwo/LRUCache.java b/src/main/java/net/woggioni/jwo/LRUCache.java
index c2d529a..24d0915 100644
--- a/src/main/java/net/woggioni/jwo/LRUCache.java
+++ b/src/main/java/net/woggioni/jwo/LRUCache.java
@@ -8,12 +8,12 @@ public class LRUCache {
     public static <K, V> Map<K, V> of(final long maxSize, final Function<K, V> loader, Class<K> cls) {
         return new LinkedHashMap<K, V>() {
             @Override
-            protected boolean removeEldestEntry(Map.Entry eldest) {
+            protected boolean removeEldestEntry(final Map.Entry eldest) {
                 return size() >= maxSize;
             }
 
             @Override
-            public V get(Object key) {
+            public V get(final Object key) {
                 if(cls.isInstance(key)) {
                     return computeIfAbsent((K) key, loader);
                 } else {
@@ -22,17 +22,17 @@ public class LRUCache {
             }
 
             @Override
-            public void putAll(Map<? extends K, ? extends V> m) {
+            public void putAll(final Map<? extends K, ? extends V> m) {
                 throw new UnsupportedOperationException();
             }
 
             @Override
-            public V put(K key, V value) {
+            public V put(final K key, final V value) {
                 throw new UnsupportedOperationException();
             }
 
             @Override
-            public V putIfAbsent(K key, V value) {
+            public V putIfAbsent(final K key, final V value) {
                 throw new UnsupportedOperationException();
             }
         };
diff --git a/src/main/java/net/woggioni/jwo/LazyOptional.java b/src/main/java/net/woggioni/jwo/LazyOptional.java
index 6874983..312b00c 100644
--- a/src/main/java/net/woggioni/jwo/LazyOptional.java
+++ b/src/main/java/net/woggioni/jwo/LazyOptional.java
@@ -15,14 +15,14 @@ public class LazyOptional<T> {
     private final Supplier<T> producer;
     private final MutableTuple2<T, Boolean> instance = MutableTuple2.newInstance(null, false);
 
-    public static <U> LazyOptional<U> of(Supplier<U> producer) {
+    public static <U> LazyOptional<U> of(final Supplier<U> producer) {
         return new LazyOptional<>(producer);
     }
 
-    public static <U> LazyOptional<U> or(LazyOptional<U>... opts) {
+    public static <U> LazyOptional<U> or(final LazyOptional<U>... opts) {
         return LazyOptional.of(() -> {
-                for (LazyOptional<U> opt : opts) {
-                    U value = opt.get();
+                for (final LazyOptional<U> opt : opts) {
+                    final U value = opt.get();
                     if (value != null) return value;
                 }
                 return null;
@@ -34,17 +34,17 @@ public class LazyOptional<T> {
         return (LazyOptional<U>) empty;
     }
 
-    public <U> LazyOptional<U> map(Function<T, U> mapping) {
+    public <U> LazyOptional<U> map(final Function<T, U> mapping) {
         return LazyOptional.of(() -> {
-            T prevValue = producer.get();
+            final T prevValue = producer.get();
             if (prevValue == null) return null;
             else return mapping.apply(prevValue);
         });
     }
 
-    public LazyOptional<T> filter(Predicate<T> predicate) {
+    public LazyOptional<T> filter(final Predicate<T> predicate) {
         return LazyOptional.of(() -> {
-            T prevValue = producer.get();
+            final T prevValue = producer.get();
             if (predicate.test(prevValue)) return prevValue;
             else return null;
         });
@@ -55,7 +55,7 @@ public class LazyOptional<T> {
         synchronized (instance) {
             if (instance.get_2()) return instance.get_1();
             else {
-                T value = producer.get();
+                final T value = producer.get();
                 instance.set_1(value);
                 instance.set_2(true);
                 return value;
@@ -63,9 +63,9 @@ public class LazyOptional<T> {
         }
     }
 
-    public <U> LazyOptional<U> flatMap(Function<T, LazyOptional<U>> mapping) {
+    public <U> LazyOptional<U> flatMap(final Function<T, LazyOptional<U>> mapping) {
         return new LazyOptional<>(() -> {
-            T prevValue = producer.get();
+            final T prevValue = producer.get();
             if (prevValue == null) return null;
             else return mapping.apply(prevValue).get();
         });
diff --git a/src/main/java/net/woggioni/jwo/LazyValue.java b/src/main/java/net/woggioni/jwo/LazyValue.java
index 8c155f8..7e1b89c 100644
--- a/src/main/java/net/woggioni/jwo/LazyValue.java
+++ b/src/main/java/net/woggioni/jwo/LazyValue.java
@@ -19,9 +19,9 @@ public interface LazyValue<T> {
 
     T get();
 
-    <U> LazyValue<U> handle(BiFunction<T, Throwable, U> bifun);
+    <U> LazyValue<U> handle(final BiFunction<T, Throwable, U> bifun);
 
-    <U> LazyValue<U> map(Function<T, U> fun);
+    <U> LazyValue<U> map(final Function<T, U> fun);
 
     Stream<T> stream();
 
@@ -32,7 +32,7 @@ public interface LazyValue<T> {
      */
     Optional<T> close();
 
-    static <T> LazyValue<T> of(Supplier<T> supplier, ThreadSafetyMode locking, Consumer<T> finalizer) {
+    static <T> LazyValue<T> of(final Supplier<T> supplier, final ThreadSafetyMode locking, final Consumer<T> finalizer) {
         LazyValue<T> result;
         switch (locking) {
             case SYNCHRONIZED:
@@ -47,7 +47,7 @@ public interface LazyValue<T> {
         return result;
     }
 
-    static <T> LazyValue<T> of(Supplier<T> supplier, ThreadSafetyMode locking) {
+    static <T> LazyValue<T> of(final Supplier<T> supplier, final ThreadSafetyMode locking) {
         return of(supplier, locking, null);
     }
 }
diff --git a/src/main/java/net/woggioni/jwo/Leb128.java b/src/main/java/net/woggioni/jwo/Leb128.java
index cdabf61..3768a2d 100644
--- a/src/main/java/net/woggioni/jwo/Leb128.java
+++ b/src/main/java/net/woggioni/jwo/Leb128.java
@@ -9,21 +9,21 @@ import java.io.OutputStream;
 
 public class Leb128 {
 
-    public static long reverse(long n) {
+    public static long reverse(final long n) {
         long res = 0;
         for(int i = 0; i < 8; i++) {
-            long b = (n & (0xFFL << (i * 8))) >>> (i * 8);
+            final long b = (n & (0xFFL << (i * 8))) >>> (i * 8);
             res |= b << ((7 - i) * 8);
         }
         return res;
     }
 
-    public static int encode(OutputStream os, double input) {
+    public static int encode(final OutputStream os, final double input) {
         return encode(os, reverse(Double.doubleToLongBits(input)));
     }
 
     @SneakyThrows
-    public static int encode(OutputStream os, long input) {
+    public static int encode(final OutputStream os, final long input) {
         int bytes_written = 0;
         long number = input >= 0 ? (input << 1) : (-(input + 1)) << 1 | 1;
         while((number & 127L) != number) {
@@ -62,7 +62,7 @@ public class Leb128 {
         public long decode() {
             long res = 0;
             for(int i = 0; i < (8 * 8 + 6) / 7; i++) {
-                int c = is.read();
+                final int c = is.read();
                 bytesRead++;
                 if(c < 0) {
                     throw new IllegalArgumentException("Unexpected end of file");
diff --git a/src/main/java/net/woggioni/jwo/LexicographicIterableComparator.java b/src/main/java/net/woggioni/jwo/LexicographicIterableComparator.java
index a605427..c825fe3 100644
--- a/src/main/java/net/woggioni/jwo/LexicographicIterableComparator.java
+++ b/src/main/java/net/woggioni/jwo/LexicographicIterableComparator.java
@@ -13,7 +13,7 @@ public class LexicographicIterableComparator<T> implements Comparator<Iterable<T
     }
 
     @Override
-    public int compare(Iterable<T> iterable1, Iterable<T> iterable2) {
+    public int compare(final Iterable<T> iterable1, final Iterable<T> iterable2) {
         final Iterator<T> it1 = iterable1.iterator(), it2 = iterable2.iterator();
         while (it1.hasNext() && it2.hasNext()) {
             final int cmp = elementComparator.compare(it1.next(),it2.next());
@@ -24,7 +24,7 @@ public class LexicographicIterableComparator<T> implements Comparator<Iterable<T
         return 0;
     }
 
-    public static <S extends Comparable<S>> LexicographicIterableComparator<S> forClass(Class<S> cls) {
+    public static <S extends Comparable<S>> LexicographicIterableComparator<S> forClass(final Class<S> cls) {
         return new LexicographicIterableComparator<S>(Comparator.naturalOrder());
     }
 }
\ No newline at end of file
diff --git a/src/main/java/net/woggioni/jwo/ListView.java b/src/main/java/net/woggioni/jwo/ListView.java
index 5406ec3..ec12b68 100644
--- a/src/main/java/net/woggioni/jwo/ListView.java
+++ b/src/main/java/net/woggioni/jwo/ListView.java
@@ -17,7 +17,7 @@ public class ListView<T> implements List<T> {
     private final int start;
     private final int end;
 
-    public ListView(List<T> delegate, int start) {
+    public ListView(final List<T> delegate, final int start) {
         this(delegate, start, -1);
     }
 
@@ -32,8 +32,8 @@ public class ListView<T> implements List<T> {
     }
 
     @Override
-    public boolean contains(Object o) {
-        Iterator<T> it = iterator();
+    public boolean contains(final Object o) {
+        final Iterator<T> it = iterator();
         while (it.hasNext()) {
             if(Objects.equals(o, it.next())) {
                 return true;
@@ -60,8 +60,8 @@ public class ListView<T> implements List<T> {
 
     @Override
     public Object[] toArray() {
-        int size = size();
-        Object[] result = new Object[size];
+        final int size = size();
+        final Object[] result = new Object[size];
         for(int i = 0; i < size; i++) {
             result[i] = get(i);
         }
@@ -69,9 +69,9 @@ public class ListView<T> implements List<T> {
     }
 
     @Override
-    public <T1> T1[] toArray(T1[] t1s) {
-        int size = size();
-        T1[] result = Arrays.copyOf(t1s, size);
+    public <T1> T1[] toArray(final T1[] t1s) {
+        final int size = size();
+        final T1[] result = Arrays.copyOf(t1s, size);
         for(int i = 0; i < size; i++) {
             result[i] = (T1) get(i);
         }
@@ -79,37 +79,37 @@ public class ListView<T> implements List<T> {
     }
 
     @Override
-    public boolean add(T t) {
+    public boolean add(final T t) {
         throw new UnsupportedOperationException();
     }
 
     @Override
-    public boolean remove(Object o) {
+    public boolean remove(final Object o) {
         throw new UnsupportedOperationException();
     }
 
     @Override
-    public boolean containsAll(Collection<?> collection) {
+    public boolean containsAll(final Collection<?> collection) {
         return false;
     }
 
     @Override
-    public boolean addAll(Collection<? extends T> collection) {
+    public boolean addAll(final Collection<? extends T> collection) {
         throw new UnsupportedOperationException();
     }
 
     @Override
-    public boolean addAll(int i, Collection<? extends T> collection) {
+    public boolean addAll(final int i, final Collection<? extends T> collection) {
         throw new UnsupportedOperationException();
     }
 
     @Override
-    public boolean removeAll(Collection<?> collection) {
+    public boolean removeAll(final Collection<?> collection) {
         throw new UnsupportedOperationException();
     }
 
     @Override
-    public boolean retainAll(Collection<?> collection) {
+    public boolean retainAll(final Collection<?> collection) {
         throw new UnsupportedOperationException();
     }
 
@@ -119,8 +119,8 @@ public class ListView<T> implements List<T> {
     }
 
     @Override
-    public T get(int i) {
-        int index = start + i;
+    public T get(final int i) {
+        final int index = start + i;
         if(end >= 0 && index < end) {
             throw new IndexOutOfBoundsException(Integer.toString(i));
         }
@@ -128,23 +128,23 @@ public class ListView<T> implements List<T> {
     }
 
     @Override
-    public T set(int i, T t) {
+    public T set(final int i, final T t) {
         throw new UnsupportedOperationException();
     }
 
     @Override
-    public void add(int i, T t) {
+    public void add(final int i, final T t) {
         throw new UnsupportedOperationException();
     }
 
     @Override
-    public T remove(int i) {
+    public T remove(final int i) {
         throw new UnsupportedOperationException();
     }
 
     @Override
-    public int indexOf(Object o) {
-        int size = size();
+    public int indexOf(final Object o) {
+        final int size = size();
         for(int i = 0; i < size; i++) {
             if(Objects.equals(o, get(i))) {
                 return i;
@@ -154,8 +154,8 @@ public class ListView<T> implements List<T> {
     }
 
     @Override
-    public int lastIndexOf(Object o) {
-        int size = size();
+    public int lastIndexOf(final Object o) {
+        final int size = size();
         for(int i = size - 1; i >= 0; i--) {
             if(Objects.equals(o, get(i))) {
                 return i;
@@ -170,7 +170,7 @@ public class ListView<T> implements List<T> {
     }
 
     @Override
-    public ListIterator<T> listIterator(int i) {
+    public ListIterator<T> listIterator(final int i) {
         if(i < 0 || i > size()) {
             throw new IndexOutOfBoundsException(Integer.toString(0));
         } else {
@@ -179,7 +179,7 @@ public class ListView<T> implements List<T> {
     }
 
     @Override
-    public List<T> subList(int i, int i1) {
+    public List<T> subList(final int i, final int i1) {
         if(i < 0) {
             throw new IndexOutOfBoundsException(Integer.toString(0));
         } else if(i1 > size()) {
@@ -195,7 +195,7 @@ public class ListView<T> implements List<T> {
         int size;
         int i;
 
-        public ListViewIterator(ListView<T> listView, int start) {
+        public ListViewIterator(final ListView<T> listView, final int start) {
             this.listView = listView;
             size = listView.size();
             i = start;
@@ -237,12 +237,12 @@ public class ListView<T> implements List<T> {
         }
 
         @Override
-        public void set(T t) {
+        public void set(final T t) {
             throw new UnsupportedOperationException();
         }
 
         @Override
-        public void add(T t) {
+        public void add(final T t) {
             throw new UnsupportedOperationException();
         }
     }
diff --git a/src/main/java/net/woggioni/jwo/LockFile.java b/src/main/java/net/woggioni/jwo/LockFile.java
index 2472d56..84a31af 100644
--- a/src/main/java/net/woggioni/jwo/LockFile.java
+++ b/src/main/java/net/woggioni/jwo/LockFile.java
@@ -31,7 +31,7 @@ public abstract class LockFile implements AutoCloseable {
         @Setter
         private FileLock fileLock;
 
-        public LockFileMapValue(Path path) {
+        public LockFileMapValue(final Path path) {
             threadLock = new ReentrantReadWriteLock();
             readerCount = new AtomicInteger(0);
             fileLock = null;
@@ -40,7 +40,7 @@ public abstract class LockFile implements AutoCloseable {
 
     private static Map<Path, LockFileMapValue> map = Collections.synchronizedMap(new HashMap<>());
 
-    private static FileChannel openFileChannel(Path path) throws IOException {
+    private static FileChannel openFileChannel(final Path path) throws IOException {
         Files.createDirectories(path.getParent());
         return FileChannel.open(path, EnumSet.of(StandardOpenOption.CREATE, StandardOpenOption.READ, StandardOpenOption.WRITE));
     }
@@ -72,9 +72,9 @@ public abstract class LockFile implements AutoCloseable {
             return new LockFile() {
                 @Override
                 public void close() throws IOException {
-                    int remainingReaders = lockFileMapValue.getReaderCount().decrementAndGet();
+                    final int remainingReaders = lockFileMapValue.getReaderCount().decrementAndGet();
                     if(remainingReaders == 0) {
-                        FileLock fileLock = lockFileMapValue.getFileLock();
+                        final FileLock fileLock = lockFileMapValue.getFileLock();
                         fileLock.release();
                         fileLock.channel().close();
                         lockFileMapValue.setFileLock(null);
@@ -116,11 +116,11 @@ public abstract class LockFile implements AutoCloseable {
         }
     }
 
-    public static LockFile tryAcquire(Path path, boolean shared) throws IOException {
+    public static LockFile tryAcquire(final Path path, final boolean shared) throws IOException {
         return acquireInternal(path, shared, false);
     }
 
-    public static LockFile acquire(Path path, boolean shared) throws IOException {
+    public static LockFile acquire(final Path path, final boolean shared) throws IOException {
         return acquireInternal(path, shared, true);
     }
 }
diff --git a/src/main/java/net/woggioni/jwo/LoggerController.java b/src/main/java/net/woggioni/jwo/LoggerController.java
index 67ae666..d7a02f9 100644
--- a/src/main/java/net/woggioni/jwo/LoggerController.java
+++ b/src/main/java/net/woggioni/jwo/LoggerController.java
@@ -22,13 +22,13 @@ public class LoggerController {
     private static final Queue<SubstituteLoggingEvent> eventQueue = new LinkedBlockingQueue<>();
     private static final List<SubstituteLogger> substituteLoggers = new ArrayList<>();
 
-    public static Logger lazyLogger(String className) {
+    public static Logger lazyLogger(final String className) {
         synchronized (lock) {
             Logger result;
             if (initialized) {
                 result = LoggerFactory.getLogger(className);
             } else {
-                SubstituteLogger substituteLogger = new SubstituteLogger(className, eventQueue, false);
+                final SubstituteLogger substituteLogger = new SubstituteLogger(className, eventQueue, false);
                 substituteLoggers.add(substituteLogger);
                 result = substituteLogger;
             }
@@ -36,20 +36,20 @@ public class LoggerController {
         }
     }
 
-    public static Logger lazyLogger(Class<?> cls) {
+    public static Logger lazyLogger(final Class<?> cls) {
         return lazyLogger(cls.getName());
     }
 
     public static void initializeLoggers() {
         synchronized (lock) {
             SubstituteLogger firstLogger = null;
-            for (SubstituteLogger log : substituteLoggers) {
+            for (final SubstituteLogger log : substituteLoggers) {
                 if (firstLogger == null) firstLogger = log;
-                Logger realLogger = LoggerFactory.getLogger(log.getName());
+                final Logger realLogger = LoggerFactory.getLogger(log.getName());
                 log.setDelegate(realLogger);
             }
             if (firstLogger != null) {
-                for (LoggingEvent evt : eventQueue) {
+                for (final LoggingEvent evt : eventQueue) {
                     firstLogger.log(evt);
                 }
             }
diff --git a/src/main/java/net/woggioni/jwo/LongMath.java b/src/main/java/net/woggioni/jwo/LongMath.java
index dc407e3..c7a1f00 100644
--- a/src/main/java/net/woggioni/jwo/LongMath.java
+++ b/src/main/java/net/woggioni/jwo/LongMath.java
@@ -6,7 +6,7 @@ import lombok.NoArgsConstructor;
 @NoArgsConstructor(access = AccessLevel.PRIVATE)
 public class LongMath {
 
-    public static long ceilDiv(long a, long b) {
+    public static long ceilDiv(final long a, final long b) {
         if(a <= 0) throw new IllegalArgumentException("a must be positive");
         return 1 + (a - 1) / b;
     }
diff --git a/src/main/java/net/woggioni/jwo/LookAheadInputStream.java b/src/main/java/net/woggioni/jwo/LookAheadInputStream.java
index d8f203a..dfb8015 100644
--- a/src/main/java/net/woggioni/jwo/LookAheadInputStream.java
+++ b/src/main/java/net/woggioni/jwo/LookAheadInputStream.java
@@ -12,7 +12,7 @@ public class LookAheadInputStream extends InputStream {
     private int cursor = -1;
     private int currentByte;
 
-    public LookAheadInputStream(InputStream stream) {
+    public LookAheadInputStream(final InputStream stream) {
         this.stream = stream;
     }
 
diff --git a/src/main/java/net/woggioni/jwo/LookAheadTextInputStream.java b/src/main/java/net/woggioni/jwo/LookAheadTextInputStream.java
index 52e0b4b..11ae941 100644
--- a/src/main/java/net/woggioni/jwo/LookAheadTextInputStream.java
+++ b/src/main/java/net/woggioni/jwo/LookAheadTextInputStream.java
@@ -14,7 +14,7 @@ public class LookAheadTextInputStream extends InputStream {
     private int currentChar;
 
 
-    public LookAheadTextInputStream(Reader reader) {
+    public LookAheadTextInputStream(final Reader reader) {
         this.reader = reader;
     }
 
diff --git a/src/main/java/net/woggioni/jwo/LruCache.java b/src/main/java/net/woggioni/jwo/LruCache.java
index 305cb12..f5ec4c5 100644
--- a/src/main/java/net/woggioni/jwo/LruCache.java
+++ b/src/main/java/net/woggioni/jwo/LruCache.java
@@ -23,19 +23,19 @@ public class LruCache<K, V> implements Map<K, V> {
 
     private final Chronometer chronometer = new Chronometer();
 
-    public LruCache(int maxSize) {
+    public LruCache(final int maxSize) {
         this(maxSize, false);
     }
 
-    public LruCache(int maxSize, boolean threadSafe) {
+    public LruCache(final int maxSize, final boolean threadSafe) {
         this(maxSize, threadSafe, null, null);
     }
 
-    public LruCache(int maxSize, boolean threadSafe, Function<? super K, ? extends V> loader) {
+    public LruCache(final int maxSize, final boolean threadSafe, final Function<? super K, ? extends V> loader) {
         this(maxSize, threadSafe, loader, null);
     }
 
-    public LruCache(int maxSize, boolean threadSafe, Function<? super K, ? extends V> loader, Map<K,V> fallback) {
+    public LruCache(final int maxSize, final boolean threadSafe, final Function<? super K, ? extends V> loader, final Map<K,V> fallback) {
         this.linkedHashMap = new LinkedHashMap<>();
         this.mtx = threadSafe ? linkedHashMap : null;
         this.maxSize = maxSize;
@@ -48,7 +48,7 @@ public class LruCache<K, V> implements Map<K, V> {
             } else {
                 this.loader = (K key) -> {
                     this.stats.miss++;
-                    V value = fallback.get(key);
+                    final V value = fallback.get(key);
                     if (value == null) {
                         return loader.apply(key);
                     } else {
@@ -62,7 +62,7 @@ public class LruCache<K, V> implements Map<K, V> {
         this.fallback = fallback;
     }
 
-    private <T> T withMutex(Supplier<T> supplier) {
+    private <T> T withMutex(final Supplier<T> supplier) {
         if(mtx != null) {
             synchronized (mtx) {
                 return supplier.get();
@@ -87,11 +87,11 @@ public class LruCache<K, V> implements Map<K, V> {
     }
 
     @Override
-    public boolean containsKey(Object key) {
+    public boolean containsKey(final Object key) {
         K k;
         try {
             k = (K) key;
-        } catch (ClassCastException cce) {
+        } catch (final ClassCastException cce) {
             return false;
         }
         return withMutex(() -> {
@@ -104,7 +104,7 @@ public class LruCache<K, V> implements Map<K, V> {
     }
 
     @Override
-    public boolean containsValue(Object value) {
+    public boolean containsValue(final Object value) {
         return withMutex(() -> {
             boolean result = linkedHashMap.containsValue(value);
             if(!result && fallback != null) {
@@ -114,7 +114,7 @@ public class LruCache<K, V> implements Map<K, V> {
         });
     }
 
-    private V getOrFallback(K key) {
+    private V getOrFallback(final K key) {
         V value = linkedHashMap.get(key);
         if(value == null) {
             stats.miss++;
@@ -129,11 +129,11 @@ public class LruCache<K, V> implements Map<K, V> {
     }
 
     @Override
-    public V get(Object key) {
+    public V get(final Object key) {
         K k;
         try {
             k = (K) key;
-        } catch (ClassCastException cce) {
+        } catch (final ClassCastException cce) {
             return null;
         }
         return withMutex(() -> {
@@ -141,7 +141,7 @@ public class LruCache<K, V> implements Map<K, V> {
             if (loader != null) {
                 try {
                     chronometer.reset();
-                    V result = getOrFallback(k);
+                    final V result = getOrFallback(k);
                     if (result == null) {
                         V newValue;
                         if ((newValue = loader.apply(k)) != null) {
@@ -151,7 +151,7 @@ public class LruCache<K, V> implements Map<K, V> {
                     }
                     stats.loadingTime += chronometer.elapsed();
                     return result;
-                } catch (Exception e) {
+                } catch (final Exception e) {
                     stats.exceptions++;
                     throw e;
                 }
@@ -162,12 +162,12 @@ public class LruCache<K, V> implements Map<K, V> {
     }
 
     @Override
-    public V put(K k, V v) {
+    public V put(final K k, final V v) {
         return withMutex(() -> {
             if (linkedHashMap.size() == maxSize) {
-                Iterator<Entry<K, V>> it = linkedHashMap.entrySet().iterator();
+                final Iterator<Entry<K, V>> it = linkedHashMap.entrySet().iterator();
                 if (it.hasNext()) {
-                    Map.Entry<K, V> entry = it.next();
+                    final Map.Entry<K, V> entry = it.next();
                     remove(entry.getKey());
                     stats.evictions++;
                 }
@@ -181,10 +181,10 @@ public class LruCache<K, V> implements Map<K, V> {
     }
 
     @Override
-    public V remove(Object key) {
+    public V remove(final Object key) {
         return withMutex( () -> {
             if(fallback != null) {
-                V result = fallback.remove(key);
+                final V result = fallback.remove(key);
                 if(result != null) {
                     linkedHashMap.remove(key);
                 }
@@ -196,8 +196,8 @@ public class LruCache<K, V> implements Map<K, V> {
     }
 
     @Override
-    public void putAll(Map<? extends K, ? extends V> map) {
-        for (Map.Entry<? extends K, ? extends V> entry : map.entrySet()) {
+    public void putAll(final Map<? extends K, ? extends V> map) {
+        for (final Map.Entry<? extends K, ? extends V> entry : map.entrySet()) {
             put(entry.getKey(), entry.getValue());
         }
     }
@@ -280,11 +280,11 @@ public class LruCache<K, V> implements Map<K, V> {
             return (calls - miss) / (float) calls;
         }
 
-        public float getAverageLoadingTime(Chronometer.UnitOfMeasure unitOfMeasure) {
+        public float getAverageLoadingTime(final Chronometer.UnitOfMeasure unitOfMeasure) {
             return (float) stats.loadingTime / calls / unitOfMeasure.nanoseconds;
         }
 
-        public float getTotalLoadingTime(Chronometer.UnitOfMeasure unitOfMeasure) {
+        public float getTotalLoadingTime(final Chronometer.UnitOfMeasure unitOfMeasure) {
             return (float) stats.loadingTime / unitOfMeasure.nanoseconds;
         }
 
diff --git a/src/main/java/net/woggioni/jwo/MapBuilder.java b/src/main/java/net/woggioni/jwo/MapBuilder.java
index 9ffaf98..5902905 100644
--- a/src/main/java/net/woggioni/jwo/MapBuilder.java
+++ b/src/main/java/net/woggioni/jwo/MapBuilder.java
@@ -10,14 +10,14 @@ import java.util.stream.Stream;
 public class MapBuilder<K,V> {
     private final List<Map.Entry<K, V>> entries = new ArrayList<>();
 
-    public MapBuilder<K, V> entry(K key, V value) {
+    public MapBuilder<K, V> entry(final K key, final V value) {
         entries.add(new AbstractMap.SimpleEntry<>(key, value));
         return this;
     }
 
-    public <T> T build(Sup<Map<K,V>> factory, Function<Map<K,V>, T> finalizer) {
-        Map<K, V> result = factory.get();
-        for(Map.Entry<K, V> entry : entries) {
+    public <T> T build(final Sup<Map<K,V>> factory, final Function<Map<K,V>, T> finalizer) {
+        final Map<K, V> result = factory.get();
+        for(final Map.Entry<K, V> entry : entries) {
             result.put(entry.getKey(), entry.getValue());
         }
         return finalizer.apply(result);
@@ -27,11 +27,11 @@ public class MapBuilder<K,V> {
         return entries.stream();
     }
 
-    public Map<K,V> build(Sup<Map<K,V>> factory) {
+    public Map<K,V> build(final Sup<Map<K,V>> factory) {
         return build(factory, Function.identity());
     }
 
-    public static <K, V> MapBuilder<K, V> with(K key, V value) {
+    public static <K, V> MapBuilder<K, V> with(final K key, final V value) {
         return new MapBuilder<K, V>().entry(key, value);
     }
 }
diff --git a/src/main/java/net/woggioni/jwo/MavenVersion.java b/src/main/java/net/woggioni/jwo/MavenVersion.java
index 1229d0d..1b9ac22 100644
--- a/src/main/java/net/woggioni/jwo/MavenVersion.java
+++ b/src/main/java/net/woggioni/jwo/MavenVersion.java
@@ -63,7 +63,7 @@ public class MavenVersion implements Comparable<MavenVersion> {
         int STRING_ITEM = 1;
         int LIST_ITEM = 2;
 
-        int compareTo(Item item);
+        int compareTo(final Item item);
 
         int getType();
 
@@ -82,7 +82,7 @@ public class MavenVersion implements Comparable<MavenVersion> {
             this.value = 0;
         }
 
-        IntItem(String str) {
+        IntItem(final String str) {
             this.value = Integer.parseInt(str);
         }
 
@@ -97,14 +97,14 @@ public class MavenVersion implements Comparable<MavenVersion> {
         }
 
         @Override
-        public int compareTo(Item item) {
+        public int compareTo(final Item item) {
             if (item == null) {
                 return (value == 0) ? 0 : 1; // 1.0 == 1, 1.1 > 1
             }
 
             switch (item.getType()) {
                 case INT_ITEM:
-                    int itemValue = ((IntItem) item).value;
+                    final int itemValue = ((IntItem) item).value;
                     return Integer.compare(value, itemValue);
                 case LONG_ITEM:
                 case BIGINTEGER_ITEM:
@@ -122,7 +122,7 @@ public class MavenVersion implements Comparable<MavenVersion> {
         }
 
         @Override
-        public boolean equals(Object o) {
+        public boolean equals(final Object o) {
             if (this == o) {
                 return true;
             }
@@ -130,7 +130,7 @@ public class MavenVersion implements Comparable<MavenVersion> {
                 return false;
             }
 
-            IntItem intItem = (IntItem) o;
+            final IntItem intItem = (IntItem) o;
 
             return value == intItem.value;
         }
@@ -152,7 +152,7 @@ public class MavenVersion implements Comparable<MavenVersion> {
     private static class LongItem implements Item {
         private final long value;
 
-        LongItem(String str) {
+        LongItem(final String str) {
             this.value = Long.parseLong(str);
         }
 
@@ -167,7 +167,7 @@ public class MavenVersion implements Comparable<MavenVersion> {
         }
 
         @Override
-        public int compareTo(Item item) {
+        public int compareTo(final Item item) {
             if (item == null) {
                 return (value == 0) ? 0 : 1; // 1.0 == 1, 1.1 > 1
             }
@@ -176,7 +176,7 @@ public class MavenVersion implements Comparable<MavenVersion> {
                 case INT_ITEM:
                     return 1;
                 case LONG_ITEM:
-                    long itemValue = ((LongItem) item).value;
+                    final long itemValue = ((LongItem) item).value;
                     return Long.compare(value, itemValue);
                 case BIGINTEGER_ITEM:
                     return -1;
@@ -193,7 +193,7 @@ public class MavenVersion implements Comparable<MavenVersion> {
         }
 
         @Override
-        public boolean equals(Object o) {
+        public boolean equals(final Object o) {
             if (this == o) {
                 return true;
             }
@@ -201,7 +201,7 @@ public class MavenVersion implements Comparable<MavenVersion> {
                 return false;
             }
 
-            LongItem longItem = (LongItem) o;
+            final LongItem longItem = (LongItem) o;
 
             return value == longItem.value;
         }
@@ -223,7 +223,7 @@ public class MavenVersion implements Comparable<MavenVersion> {
     private static class BigIntegerItem implements Item {
         private final BigInteger value;
 
-        BigIntegerItem(String str) {
+        BigIntegerItem(final String str) {
             this.value = new BigInteger(str);
         }
 
@@ -238,7 +238,7 @@ public class MavenVersion implements Comparable<MavenVersion> {
         }
 
         @Override
-        public int compareTo(Item item) {
+        public int compareTo(final Item item) {
             if (item == null) {
                 return BigInteger.ZERO.equals(value) ? 0 : 1; // 1.0 == 1, 1.1 > 1
             }
@@ -263,7 +263,7 @@ public class MavenVersion implements Comparable<MavenVersion> {
         }
 
         @Override
-        public boolean equals(Object o) {
+        public boolean equals(final Object o) {
             if (this == o) {
                 return true;
             }
@@ -271,7 +271,7 @@ public class MavenVersion implements Comparable<MavenVersion> {
                 return false;
             }
 
-            BigIntegerItem that = (BigIntegerItem) o;
+            final BigIntegerItem that = (BigIntegerItem) o;
 
             return value.equals(that.value);
         }
@@ -310,7 +310,7 @@ public class MavenVersion implements Comparable<MavenVersion> {
 
         private final String value;
 
-        StringItem(String value, boolean followedByDigit) {
+        StringItem(String value, final boolean followedByDigit) {
             if (followedByDigit && value.length() == 1) {
                 // a1 = alpha-1, b1 = beta-1, m1 = milestone-1
                 switch (value.charAt(0)) {
@@ -352,14 +352,14 @@ public class MavenVersion implements Comparable<MavenVersion> {
          * @param qualifier
          * @return an equivalent value that can be used with lexical comparison
          */
-        public static String comparableQualifier(String qualifier) {
-            int i = QUALIFIERS.indexOf(qualifier);
+        public static String comparableQualifier(final String qualifier) {
+            final int i = QUALIFIERS.indexOf(qualifier);
 
             return i == -1 ? (QUALIFIERS.size() + "-" + qualifier) : String.valueOf(i);
         }
 
         @Override
-        public int compareTo(Item item) {
+        public int compareTo(final Item item) {
             if (item == null) {
                 // 1-rc < 1, 1-ga > 1
                 return comparableQualifier(value).compareTo(RELEASE_VERSION_INDEX);
@@ -382,7 +382,7 @@ public class MavenVersion implements Comparable<MavenVersion> {
         }
 
         @Override
-        public boolean equals(Object o) {
+        public boolean equals(final Object o) {
             if (this == o) {
                 return true;
             }
@@ -390,7 +390,7 @@ public class MavenVersion implements Comparable<MavenVersion> {
                 return false;
             }
 
-            StringItem that = (StringItem) o;
+            final StringItem that = (StringItem) o;
 
             return value.equals(that.value);
         }
@@ -422,7 +422,7 @@ public class MavenVersion implements Comparable<MavenVersion> {
 
         void normalize() {
             for (int i = size() - 1; i >= 0; i--) {
-                Item lastItem = get(i);
+                final Item lastItem = get(i);
 
                 if (lastItem.isNull()) {
                     // remove null trailing items: 0, "", empty list
@@ -434,14 +434,14 @@ public class MavenVersion implements Comparable<MavenVersion> {
         }
 
         @Override
-        public int compareTo(Item item) {
+        public int compareTo(final Item item) {
             if (item == null) {
                 if (size() == 0) {
                     return 0; // 1-0 = 1- (normalize) = 1
                 }
                 // Compare the entire list of items with null - not just the first one, MNG-6964
-                for (Item i : this) {
-                    int result = i.compareTo(null);
+                for (final Item i : this) {
+                    final int result = i.compareTo(null);
                     if (result != 0) {
                         return result;
                     }
@@ -458,15 +458,15 @@ public class MavenVersion implements Comparable<MavenVersion> {
                     return 1; // 1-1 > 1-sp
 
                 case LIST_ITEM:
-                    Iterator<Item> left = iterator();
-                    Iterator<Item> right = ((ListItem) item).iterator();
+                    final Iterator<Item> left = iterator();
+                    final Iterator<Item> right = ((ListItem) item).iterator();
 
                     while (left.hasNext() || right.hasNext()) {
-                        Item l = left.hasNext() ? left.next() : null;
-                        Item r = right.hasNext() ? right.next() : null;
+                        final Item l = left.hasNext() ? left.next() : null;
+                        final Item r = right.hasNext() ? right.next() : null;
 
                         // if this is shorter, then invert the compare and mul with -1
-                        int result = l == null ? (r == null ? 0 : -1 * r.compareTo(l)) : l.compareTo(r);
+                        final int result = l == null ? (r == null ? 0 : -1 * r.compareTo(l)) : l.compareTo(r);
 
                         if (result != 0) {
                             return result;
@@ -482,8 +482,8 @@ public class MavenVersion implements Comparable<MavenVersion> {
 
         @Override
         public String toString() {
-            StringBuilder buffer = new StringBuilder();
-            for (Item item : this) {
+            final StringBuilder buffer = new StringBuilder();
+            for (final Item item : this) {
                 if (buffer.length() > 0) {
                     buffer.append((item instanceof ListItem) ? '-' : '.');
                 }
@@ -496,9 +496,9 @@ public class MavenVersion implements Comparable<MavenVersion> {
          * Return the contents in the same format that is used when you call toString() on a List.
          */
         private String toListString() {
-            StringBuilder buffer = new StringBuilder();
+            final StringBuilder buffer = new StringBuilder();
             buffer.append("[");
-            for (Item item : this) {
+            for (final Item item : this) {
                 if (buffer.length() > 1) {
                     buffer.append(", ");
                 }
@@ -513,7 +513,7 @@ public class MavenVersion implements Comparable<MavenVersion> {
         }
     }
 
-    public MavenVersion(String version) {
+    public MavenVersion(final String version) {
         parseVersion(version);
     }
 
@@ -527,7 +527,7 @@ public class MavenVersion implements Comparable<MavenVersion> {
 
         ListItem list = items;
 
-        Deque<Item> stack = new ArrayDeque<>();
+        final Deque<Item> stack = new ArrayDeque<>();
         stack.push(list);
 
         boolean isDigit = false;
@@ -535,7 +535,7 @@ public class MavenVersion implements Comparable<MavenVersion> {
         int startIndex = 0;
 
         for (int i = 0; i < version.length(); i++) {
-            char c = version.charAt(i);
+            final char c = version.charAt(i);
 
             if (c == '.') {
                 if (i == startIndex) {
@@ -601,7 +601,7 @@ public class MavenVersion implements Comparable<MavenVersion> {
         }
     }
 
-    private static Item parseItem(boolean isDigit, String buf) {
+    private static Item parseItem(final boolean isDigit, String buf) {
         if (isDigit) {
             buf = stripLeadingZeroes(buf);
             if (buf.length() <= MAX_INTITEM_LENGTH) {
@@ -616,12 +616,12 @@ public class MavenVersion implements Comparable<MavenVersion> {
         return new StringItem(buf, false);
     }
 
-    private static String stripLeadingZeroes(String buf) {
+    private static String stripLeadingZeroes(final String buf) {
         if (buf == null || buf.isEmpty()) {
             return "0";
         }
         for (int i = 0; i < buf.length(); ++i) {
-            char c = buf.charAt(i);
+            final char c = buf.charAt(i);
             if (c != '0') {
                 return buf.substring(i);
             }
@@ -630,7 +630,7 @@ public class MavenVersion implements Comparable<MavenVersion> {
     }
 
     @Override
-    public int compareTo(MavenVersion o) {
+    public int compareTo(final MavenVersion o) {
         return items.compareTo(o.items);
     }
 
@@ -647,7 +647,7 @@ public class MavenVersion implements Comparable<MavenVersion> {
     }
 
     @Override
-    public boolean equals(Object o) {
+    public boolean equals(final Object o) {
         return (o instanceof MavenVersion) && items.equals(((MavenVersion) o).items);
     }
 
@@ -674,7 +674,7 @@ public class MavenVersion implements Comparable<MavenVersion> {
      * two adjacent will be compared
      */
     // CHECKSTYLE_ON: LineLength
-    public static void main(String... args) {
+    public static void main(final String... args) {
         System.out.println("Display parameters as parsed by Maven (in canonical form and as a list of tokens) and"
             + " comparison result:");
         if (args.length == 0) {
@@ -683,11 +683,11 @@ public class MavenVersion implements Comparable<MavenVersion> {
 
         MavenVersion prev = null;
         int i = 1;
-        for (String version : args) {
-            MavenVersion c = new MavenVersion(version);
+        for (final String version : args) {
+            final MavenVersion c = new MavenVersion(version);
 
             if (prev != null) {
-                int compare = prev.compareTo(c);
+                final int compare = prev.compareTo(c);
                 System.out.println("   " + prev.toString() + ' ' + ((compare == 0) ? "==" : ((compare < 0) ? "<" : ">"))
                     + ' ' + version);
             }
diff --git a/src/main/java/net/woggioni/jwo/MutableTuple2.java b/src/main/java/net/woggioni/jwo/MutableTuple2.java
index 6ffb0cb..44e052a 100644
--- a/src/main/java/net/woggioni/jwo/MutableTuple2.java
+++ b/src/main/java/net/woggioni/jwo/MutableTuple2.java
@@ -3,10 +3,10 @@ package net.woggioni.jwo;
 import net.woggioni.jwo.internal.MutableTuple2Impl;
 
 public interface MutableTuple2<T, U> extends Tuple2<T, U> {
-    void set_1(T value);
-    void set_2(U value);
+    void set_1(final T value);
+    void set_2(final U value);
 
-    static <T,U> MutableTuple2<T, U> newInstance(T x, U y) {
+    static <T,U> MutableTuple2<T, U> newInstance(final T x, final U y) {
         return new MutableTuple2Impl<T, U>(x, y);
     }
 }
diff --git a/src/main/java/net/woggioni/jwo/MutableTuple3.java b/src/main/java/net/woggioni/jwo/MutableTuple3.java
index 988777c..b7b385f 100644
--- a/src/main/java/net/woggioni/jwo/MutableTuple3.java
+++ b/src/main/java/net/woggioni/jwo/MutableTuple3.java
@@ -3,11 +3,11 @@ package net.woggioni.jwo;
 import net.woggioni.jwo.internal.MutableTuple3Impl;
 
 public interface MutableTuple3<T, U, V> extends Tuple3<T, U , V> {
-    void set_1(T value);
-    void set_2(U value);
-    void set_3(V value);
+    void set_1(final T value);
+    void set_2(final U value);
+    void set_3(final V value);
 
-    static <T, U, V> MutableTuple3<T, U, V> newInstance(T x, U y, V z) {
+    static <T, U, V> MutableTuple3<T, U, V> newInstance(final T x, final U y, final V z) {
         return new MutableTuple3Impl<>(x, y, z);
     }
 }
diff --git a/src/main/java/net/woggioni/jwo/NullOutputStream.java b/src/main/java/net/woggioni/jwo/NullOutputStream.java
index ddbd2b4..7df10c1 100644
--- a/src/main/java/net/woggioni/jwo/NullOutputStream.java
+++ b/src/main/java/net/woggioni/jwo/NullOutputStream.java
@@ -4,8 +4,8 @@ import java.io.OutputStream;
 
 public class NullOutputStream extends OutputStream {
     @Override
-    public void write(int i) {}
+    public void write(final int i) {}
 
     @Override
-    public void write(byte[] bytes) {}
+    public void write(final byte[] bytes) {}
 }
diff --git a/src/main/java/net/woggioni/jwo/NullReader.java b/src/main/java/net/woggioni/jwo/NullReader.java
index 32ec3ea..146413c 100644
--- a/src/main/java/net/woggioni/jwo/NullReader.java
+++ b/src/main/java/net/woggioni/jwo/NullReader.java
@@ -5,7 +5,7 @@ import java.io.Reader;
 
 public class NullReader extends Reader {
     @Override
-    public int read(char[] cbuf, int off, int len) throws IOException {
+    public int read(final char[] cbuf, final int off, final int len) throws IOException {
         return -1;
     }
 
diff --git a/src/main/java/net/woggioni/jwo/NullWriter.java b/src/main/java/net/woggioni/jwo/NullWriter.java
index e730232..105797b 100644
--- a/src/main/java/net/woggioni/jwo/NullWriter.java
+++ b/src/main/java/net/woggioni/jwo/NullWriter.java
@@ -5,7 +5,7 @@ import java.io.Writer;
 
 public class NullWriter extends Writer {
     @Override
-    public void write(char[] cbuf, int off, int len) throws IOException {
+    public void write(final char[] cbuf, final int off, final int len) throws IOException {
     }
 
     @Override
diff --git a/src/main/java/net/woggioni/jwo/OS.java b/src/main/java/net/woggioni/jwo/OS.java
index 01e85cc..4a55375 100644
--- a/src/main/java/net/woggioni/jwo/OS.java
+++ b/src/main/java/net/woggioni/jwo/OS.java
@@ -17,7 +17,7 @@ public enum OS {
 
     private final String value;
 
-    OS(String value) {
+    OS(final String value) {
         this.value = value;
     }
 
diff --git a/src/main/java/net/woggioni/jwo/PathClassLoader.java b/src/main/java/net/woggioni/jwo/PathClassLoader.java
index 5286490..67561ac 100644
--- a/src/main/java/net/woggioni/jwo/PathClassLoader.java
+++ b/src/main/java/net/woggioni/jwo/PathClassLoader.java
@@ -34,26 +34,26 @@ public final class PathClassLoader extends ClassLoader {
         registerAsParallelCapable();
     }
 
-    public PathClassLoader(Path ...path) {
+    public PathClassLoader(final Path ...path) {
         this(Arrays.asList(path), null);
     }
 
-    public PathClassLoader(Iterable<Path> paths) {
+    public PathClassLoader(final Iterable<Path> paths) {
         this(paths, null);
     }
 
-    public PathClassLoader(Iterable<Path> paths, ClassLoader parent) {
+    public PathClassLoader(final Iterable<Path> paths, final ClassLoader parent) {
         super(parent);
         this.paths = paths;
     }
 
     @Override
     @SneakyThrows
-    protected Class<?> findClass(String name) {
-        for(Path path : paths) {
-            Path classPath = path.resolve(name.replace('.', '/').concat(".class"));
+    protected Class<?> findClass(final String name) {
+        for(final Path path : paths) {
+            final Path classPath = path.resolve(name.replace('.', '/').concat(".class"));
             if (Files.exists(classPath)) {
-                byte[] byteCode = Files.readAllBytes(classPath);
+                final byte[] byteCode = Files.readAllBytes(classPath);
                 return defineClass(name, byteCode, 0, byteCode.length);
             }
         }
@@ -62,9 +62,9 @@ public final class PathClassLoader extends ClassLoader {
 
     @Override
     @SneakyThrows
-    protected URL findResource(String name) {
-        for(Path path : paths) {
-            Path resolved = path.resolve(name);
+    protected URL findResource(final String name) {
+        for(final Path path : paths) {
+            final Path resolved = path.resolve(name);
             if (Files.exists(resolved)) {
                 return toURL(resolved);
             }
@@ -75,10 +75,10 @@ public final class PathClassLoader extends ClassLoader {
     @Override
     protected Enumeration<URL> findResources(final String name) throws IOException {
         final List<URL> resources = new ArrayList<>(1);
-        for(Path path : paths) {
+        for(final Path path : paths) {
             Files.walkFileTree(path, new SimpleFileVisitor<Path>() {
                 @Override
-                public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
+                public FileVisitResult visitFile(final Path file, final BasicFileAttributes attrs) throws IOException {
                     if (!name.isEmpty()) {
                         this.addIfMatches(resources, file);
                     }
@@ -86,14 +86,14 @@ public final class PathClassLoader extends ClassLoader {
                 }
 
                 @Override
-                public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) throws IOException {
+                public FileVisitResult preVisitDirectory(final Path dir, final BasicFileAttributes attrs) throws IOException {
                     if (!name.isEmpty() || path.equals(dir)) {
                         this.addIfMatches(resources, dir);
                     }
                     return super.preVisitDirectory(dir, attrs);
                 }
 
-                void addIfMatches(List<URL> resources, Path file) throws IOException {
+                void addIfMatches(final List<URL> resources, final Path file) throws IOException {
                     if (path.relativize(file).toString().equals(name)) {
                         resources.add(toURL(file));
                     }
@@ -103,7 +103,7 @@ public final class PathClassLoader extends ClassLoader {
         return Collections.enumeration(resources);
     }
 
-    private static URL toURL(Path path) throws IOException {
+    private static URL toURL(final Path path) throws IOException {
         return new URL(null, path.toUri().toString(), PathURLStreamHandler.INSTANCE);
     }
 
@@ -111,7 +111,7 @@ public final class PathClassLoader extends ClassLoader {
 
         private final Path path;
 
-        PathURLConnection(URL url, Path path) {
+        PathURLConnection(final URL url, final Path path) {
             super(url);
             this.path = path;
         }
@@ -123,7 +123,7 @@ public final class PathClassLoader extends ClassLoader {
         public long getContentLengthLong() {
             try {
                 return Files.size(this.path);
-            } catch (IOException e) {
+            } catch (final IOException e) {
                 throw new RuntimeException("could not get size of: " + this.path, e);
             }
         }
@@ -147,7 +147,7 @@ public final class PathClassLoader extends ClassLoader {
         @Override
         @SneakyThrows
         public long getLastModified() {
-            BasicFileAttributes attributes = Files.readAttributes(this.path, BasicFileAttributes.class);
+            final BasicFileAttributes attributes = Files.readAttributes(this.path, BasicFileAttributes.class);
             return attributes.lastModifiedTime().toMillis();
         }
     }
@@ -159,9 +159,9 @@ public final class PathClassLoader extends ClassLoader {
 
         @Override
         @SneakyThrows
-        protected URLConnection openConnection(URL url) {
-            URI uri = url.toURI();
-            Path path = Paths.get(uri);
+        protected URLConnection openConnection(final URL url) {
+            final URI uri = url.toURI();
+            final Path path = Paths.get(uri);
             return new PathURLConnection(url, path);
         }
     }
diff --git a/src/main/java/net/woggioni/jwo/Pre.java b/src/main/java/net/woggioni/jwo/Pre.java
index 62c046a..c28cb0a 100644
--- a/src/main/java/net/woggioni/jwo/Pre.java
+++ b/src/main/java/net/woggioni/jwo/Pre.java
@@ -8,9 +8,9 @@ import java.util.function.Predicate;
 public interface Pre<T> extends Predicate<T> {
     @Override
     @SneakyThrows
-    default boolean test(T t) {
+    default boolean test(final T t) {
         return exec(t);
     }
 
-    boolean exec(T t) throws Throwable;
+    boolean exec(final T t) throws Throwable;
 }
diff --git a/src/main/java/net/woggioni/jwo/Requirement.java b/src/main/java/net/woggioni/jwo/Requirement.java
index 263dbaf..9870aea 100644
--- a/src/main/java/net/woggioni/jwo/Requirement.java
+++ b/src/main/java/net/woggioni/jwo/Requirement.java
@@ -12,12 +12,12 @@ import static net.woggioni.jwo.JWO.newThrowable;
 public class Requirement {
     private final Supplier<Boolean> booleanSupplier;
 
-    public static Requirement require(Supplier<Boolean> booleanSupplier) {
+    public static Requirement require(final Supplier<Boolean> booleanSupplier) {
         return new Requirement(booleanSupplier);
     }
 
     @SneakyThrows
-    public <T extends Throwable> void otherwise(Class<T> cls, String format, Object... args) {
+    public <T extends Throwable> void otherwise(final Class<T> cls, final String format, final Object... args) {
         if(!booleanSupplier.get()) {
             throw newThrowable(cls, format, args);
         }
diff --git a/src/main/java/net/woggioni/jwo/RetryExecutor.java b/src/main/java/net/woggioni/jwo/RetryExecutor.java
index f5c0635..c1cc407 100644
--- a/src/main/java/net/woggioni/jwo/RetryExecutor.java
+++ b/src/main/java/net/woggioni/jwo/RetryExecutor.java
@@ -37,115 +37,115 @@ public class RetryExecutor {
     }
 
     public interface ExceptionHandler {
-        ExceptionHandlerOutcome handleError(Throwable t);
+        ExceptionHandlerOutcome handleError(final Throwable t);
     }
 
-    public CompletableFuture<Void> submit(Runnable cb) {
+    public CompletableFuture<Void> submit(final Runnable cb) {
         return submit(cb, maxAttempts, initialDelay, exp, exceptionHandler, executor);
     }
 
     public CompletableFuture<Void> submit(
-        Runnable cb,
-        ExecutorService executorService) {
+            final Runnable cb,
+        final ExecutorService executorService) {
         return submit(cb, maxAttempts, initialDelay, exp, exceptionHandler, executorService);
     }
 
     public CompletableFuture<Void> submit(
-        Runnable cb,
-        ExceptionHandler exceptionHandler,
-        ExecutorService executorService) {
+            final Runnable cb,
+            final ExceptionHandler exceptionHandler,
+            final ExecutorService executorService) {
         return submit(cb, maxAttempts, initialDelay, exp, exceptionHandler, executorService);
     }
 
     public CompletableFuture<Void> submit(
-        Runnable cb,
-        Double exp,
-        ExceptionHandler exceptionHandler,
-        ExecutorService executorService) {
+            final Runnable cb,
+            final Double exp,
+            final ExceptionHandler exceptionHandler,
+            final ExecutorService executorService) {
         return submit(cb, maxAttempts, initialDelay, exp, exceptionHandler, executorService);
     }
 
     public CompletableFuture<Void> submit(
-        Runnable cb,
-        Duration initialDelay,
-        Double exp,
-        ExceptionHandler exceptionHandler,
-        ExecutorService executorService) {
+            final Runnable cb,
+            final Duration initialDelay,
+            final Double exp,
+            final ExceptionHandler exceptionHandler,
+            final ExecutorService executorService) {
         return submit(cb, maxAttempts, initialDelay, exp, exceptionHandler, executorService);
     }
     public static CompletableFuture<Void> submit(
-        Runnable cb,
-        int maxAttempts,
-        Duration initialDelay,
-        Double exp,
-        ExceptionHandler exceptionHandler,
-        Executor executor) {
+            final Runnable cb,
+            final int maxAttempts,
+            final Duration initialDelay,
+            final Double exp,
+            final ExceptionHandler exceptionHandler,
+            final Executor executor) {
         return submit(() -> {
             cb.run();
             return null;
         }, maxAttempts, initialDelay, exp, exceptionHandler, executor);
     }
 
-    public <T> CompletableFuture<T> submit(Callable<T> cb) {
+    public <T> CompletableFuture<T> submit(final Callable<T> cb) {
         return submit(cb, maxAttempts, initialDelay, exp, exceptionHandler, executor);
     }
 
     public <T> CompletableFuture<T> submit(
-        Callable<T> cb,
-        Executor executor) {
+            final Callable<T> cb,
+            final Executor executor) {
         return submit(cb, maxAttempts, initialDelay, exp, exceptionHandler, executor);
     }
 
     public <T> CompletableFuture<T> submit(
-        Callable<T> cb,
-        ExceptionHandler exceptionHandler,
-        Executor executor) {
+            final Callable<T> cb,
+            final ExceptionHandler exceptionHandler,
+            final Executor executor) {
         return submit(cb, maxAttempts, initialDelay, exp, exceptionHandler, executor);
     }
 
     public <T> CompletableFuture<T> submit(
-        Callable<T> cb,
-        Double exp,
-        ExceptionHandler exceptionHandler,
-        ExecutorService executor) {
+            final Callable<T> cb,
+            final Double exp,
+            final ExceptionHandler exceptionHandler,
+            final ExecutorService executor) {
         return submit(cb, maxAttempts, initialDelay, exp, exceptionHandler, executor);
     }
 
     public <T> CompletableFuture<T> submit(
-        Callable<T> cb,
-        Duration initialDelay,
-        Double exp,
-        ExceptionHandler exceptionHandler,
-        ExecutorService executor) {
+            final Callable<T> cb,
+            final Duration initialDelay,
+            final Double exp,
+            final ExceptionHandler exceptionHandler,
+            final ExecutorService executor) {
         return submit(cb, maxAttempts, initialDelay, exp, exceptionHandler, executor);
     }
 
     public static <T> CompletableFuture<T> submit(
-        Callable<T> cb,
-        int maxAttempts,
-        Duration initialDelay,
-        Double exp,
-        ExceptionHandler exceptionHandler,
-        Executor executor) {
+            final Callable<T> cb,
+            final int maxAttempts,
+            final Duration initialDelay,
+            final Double exp,
+            final ExceptionHandler exceptionHandler,
+            final Executor executor) {
         CompletableFuture<T> result = CompletableFuture.supplyAsync((Sup<T>) cb::call, executor);
         double delay = initialDelay.toMillis();
         for(int i = 1; i <= maxAttempts; i++) {
-            int attempt = i;
-            double thisAttemptDelay = delay;
+            final int attempt = i;
+            final double thisAttemptDelay = delay;
             result = result.handleAsync((BiFun<T, Throwable, CompletableFuture<T>>) (value, err) -> {
-                Optional<Throwable> causeOpt = Optional.ofNullable(err).map(Throwable::getCause);
+                final Optional<Throwable> causeOpt = Optional.ofNullable(err).map(Throwable::getCause);
                 if(!causeOpt.isPresent()) {
                     return CompletableFuture.completedFuture(value);
                 } else if(attempt == maxAttempts) {
                     throw causeOpt.get();
                 } else {
-                    Throwable cause = causeOpt.get();
-                    ExceptionHandlerOutcome eho = exceptionHandler.handleError(cause);
+                    final Throwable cause = causeOpt.get();
+                    final ExceptionHandlerOutcome eho = exceptionHandler.handleError(cause);
                     switch (eho) {
                         case THROW:
                             throw cause;
                         case CONTINUE:
-                            Executor delayedExecutor = delayedExecutor(
+                            final Executor delayedExecutor = delayedExecutor(
                                 (long) thisAttemptDelay,
                                 TimeUnit.MILLISECONDS,
                                 executor
diff --git a/src/main/java/net/woggioni/jwo/SQL.java b/src/main/java/net/woggioni/jwo/SQL.java
index 232f173..6c8e2c9 100644
--- a/src/main/java/net/woggioni/jwo/SQL.java
+++ b/src/main/java/net/woggioni/jwo/SQL.java
@@ -26,12 +26,12 @@ public class SQL {
 
         private final Map<String, Tuple2<Object, Class<?>>> fields = new TreeMap<>();
 
-        public QueryBuilder field(String name, Object value, Class<?> cls) {
+        public QueryBuilder field(final String name, final Object value, final Class<?> cls) {
             fields.put(name, Tuple2.newInstance(value, cls));
             return this;
         }
 
-        public QueryBuilder field(String name, Object value) {
+        public QueryBuilder field(final String name, final Object value) {
             if(value == null) {
                 throw newThrowable(IllegalArgumentException.class, "Class argument required for null value");
             }
@@ -39,15 +39,15 @@ public class SQL {
         }
 
         @SneakyThrows
-        public PreparedStatement buildStatement(Connection conn) {
-            StringBuilder sb = new StringBuilder();
+        public PreparedStatement buildStatement(final Connection conn) {
+            final StringBuilder sb = new StringBuilder();
             switch (operation) {
                 case INSERT:
                     sb.append("INSERT INTO ");
                     sb.append(tableName);
                     sb.append(" (");
                     int i = 0;
-                    List<Map.Entry<String, Tuple2<Object, Class<?>>>> entries = new ArrayList<>(fields.entrySet());
+                    final List<Map.Entry<String, Tuple2<Object, Class<?>>>> entries = new ArrayList<>(fields.entrySet());
                     for(Map.Entry<String, Tuple2<Object, Class<?>>> entry : entries) {
                         if(i++ > 0) sb.append(',');
                         sb.append(entry.getKey());
@@ -58,12 +58,12 @@ public class SQL {
                         if(i > 0) sb.append(',');
                     }
                     sb.append(");");
-                    PreparedStatement stmt = conn.prepareStatement(sb.toString());
+                    final PreparedStatement stmt = conn.prepareStatement(sb.toString());
                     i = 1;
-                    for(Map.Entry<String, Tuple2<Object, Class<?>>> entry : entries) {
-                        Tuple2<Object, Class<?>> tuple2 = entry.getValue();
-                        Object value = tuple2.get_1();
-                        Class<?> cls = tuple2.get_2();
+                    for(final Map.Entry<String, Tuple2<Object, Class<?>>> entry : entries) {
+                        final Tuple2<Object, Class<?>> tuple2 = entry.getValue();
+                        final Object value = tuple2.get_1();
+                        final  Class<?> cls = tuple2.get_2();
                         if(cls.isAssignableFrom(String.class)) {
                             stmt.setString(i, (String) value);
                         } else if(cls.isAssignableFrom(Integer.class)) {
diff --git a/src/main/java/net/woggioni/jwo/SignatureCollector.java b/src/main/java/net/woggioni/jwo/SignatureCollector.java
index 60c4898..0fe94a0 100644
--- a/src/main/java/net/woggioni/jwo/SignatureCollector.java
+++ b/src/main/java/net/woggioni/jwo/SignatureCollector.java
@@ -27,13 +27,13 @@ class SignatureCollector {
     /**
      * @return if the [entry] [JarEntry] can be signed.
      */
-    static boolean isSignable(JarEntry entry) {
+    static boolean isSignable(final JarEntry entry) {
         return !entry.isDirectory() && !unsignableEntryName.matcher(entry.getName()).matches();
     }
 
-    private static Set<PublicKey> signers2OrderedPublicKeys(CodeSigner[] signers) {
-        Set<PublicKey> result = new LinkedHashSet<>();
-        for (CodeSigner signer : signers) {
+    private static Set<PublicKey> signers2OrderedPublicKeys(final CodeSigner[] signers) {
+        final Set<PublicKey> result = new LinkedHashSet<>();
+        for (final CodeSigner signer : signers) {
             result.add((signer.getSignerCertPath().getCertificates().get(0)).getPublicKey());
         }
         return Collections.unmodifiableSet(result);
@@ -47,13 +47,13 @@ class SignatureCollector {
         return Collections.unmodifiableSet(_certificates);
     }
 
-    public void addEntry(JarEntry jarEntry) {
+    public void addEntry(final JarEntry jarEntry) {
         if (isSignable(jarEntry)) {
-            CodeSigner[] entrySigners = jarEntry.getCodeSigners() != null ? jarEntry.getCodeSigners() : new CodeSigner[0];
+            final CodeSigner[] entrySigners = jarEntry.getCodeSigners() != null ? jarEntry.getCodeSigners() : new CodeSigner[0];
             if (codeSigners == null) {
                 codeSigners = entrySigners;
                 firstSignedEntry = jarEntry.getName();
-                for (CodeSigner signer : entrySigners) {
+                for (final CodeSigner signer : entrySigners) {
                     _certificates.add(signer.getSignerCertPath().getCertificates().get(0));
                 }
             }
diff --git a/src/main/java/net/woggioni/jwo/SortedProperties.java b/src/main/java/net/woggioni/jwo/SortedProperties.java
index 88c1df7..68c0b98 100644
--- a/src/main/java/net/woggioni/jwo/SortedProperties.java
+++ b/src/main/java/net/woggioni/jwo/SortedProperties.java
@@ -28,11 +28,11 @@ public class SortedProperties extends Properties {
 
     @Override
     public Set<Object> keySet() {
-        Enumeration<Object> enumeration = super.keys();
+        final Enumeration<Object> enumeration = super.keys();
 
-        TreeSet<String> sortedSet = new TreeSet<>();
+        final TreeSet<String> sortedSet = new TreeSet<>();
         while(enumeration.hasMoreElements()) {
-            String key = (String) enumeration.nextElement();
+            final String key = (String) enumeration.nextElement();
             sortedSet.add(key);
         }
         return (Set) sortedSet;
@@ -40,11 +40,11 @@ public class SortedProperties extends Properties {
 
     @Override
     public Set<Map.Entry<Object, Object>> entrySet() {
-        Enumeration<Object> enumeration = keys();
+        final Enumeration<Object> enumeration = keys();
 
-        TreeMap<String, Object> sortedMap = new TreeMap<>();
+        final TreeMap<String, Object> sortedMap = new TreeMap<>();
         while(enumeration.hasMoreElements()) {
-            String key = (String) enumeration.nextElement();
+            final String key = (String) enumeration.nextElement();
             sortedMap.put(key, get(key));
         }
         return (Set) sortedMap.entrySet();
diff --git a/src/main/java/net/woggioni/jwo/TreeNodeVisitor.java b/src/main/java/net/woggioni/jwo/TreeNodeVisitor.java
index 388e27f..3db7a86 100644
--- a/src/main/java/net/woggioni/jwo/TreeNodeVisitor.java
+++ b/src/main/java/net/woggioni/jwo/TreeNodeVisitor.java
@@ -31,7 +31,7 @@ public interface TreeNodeVisitor<NODE extends TreeNodeVisitor.TreeNode<NODE>, T>
         /**
          * @param ctx the user object to set for this stack level
          */
-        void setContext(T ctx);
+        void setContext(final T ctx);
 
         /**
          * @return the current user object
@@ -55,7 +55,7 @@ public interface TreeNodeVisitor<NODE extends TreeNodeVisitor.TreeNode<NODE>, T>
      *              current node in the tree
      * @return a boolean that will be used to decide whether to traverse the subtree rooted in the current link or not
      */
-    default VisitOutcome visitPre(List<StackContext<NODE, T>> stack) { return VisitOutcome.CONTINUE; }
+    default VisitOutcome visitPre(final List<StackContext<NODE, T>> stack) { return VisitOutcome.CONTINUE; }
 
     /**
      * This method will be called for each node using
@@ -63,5 +63,5 @@ public interface TreeNodeVisitor<NODE extends TreeNodeVisitor.TreeNode<NODE>, T>
      * @param stack is a list of {@link StackContext} instances corresponding to the full path from the root to the
      *              current node in the tree
      */
-    default void visitPost(List<StackContext<NODE, T>> stack) {}
+    default void visitPost(final List<StackContext<NODE, T>> stack) {}
 }
diff --git a/src/main/java/net/woggioni/jwo/TreeWalker.java b/src/main/java/net/woggioni/jwo/TreeWalker.java
index 3e16069..1bc223f 100644
--- a/src/main/java/net/woggioni/jwo/TreeWalker.java
+++ b/src/main/java/net/woggioni/jwo/TreeWalker.java
@@ -35,11 +35,11 @@ public class TreeWalker<NODE extends TreeNodeVisitor.TreeNode<NODE>, T> {
      * {@link TreeNodeVisitor} instance
      * @param root the root node of the tree
      */
-    public void walk(NODE root) {
-        List<StackElement<NODE, T>> stack = new ArrayList<>();
-        StackElement<NODE, T> rootStackElement = new StackElement<>(root);
+    public void walk(final NODE root) {
+        final List<StackElement<NODE, T>> stack = new ArrayList<>();
+        final StackElement<NODE, T> rootStackElement = new StackElement<>(root);
         stack.add(rootStackElement);
-        List<TreeNodeVisitor.StackContext<NODE, T>> publicStack = Collections.unmodifiableList(stack);
+        final List<TreeNodeVisitor.StackContext<NODE, T>> publicStack = Collections.unmodifiableList(stack);
         switch (visitor.visitPre(publicStack)) {
             case CONTINUE:
                 rootStackElement.childrenIterator = root.children();
@@ -51,10 +51,10 @@ public class TreeWalker<NODE extends TreeNodeVisitor.TreeNode<NODE>, T> {
                 return;
         }
         while(!stack.isEmpty()) {
-            StackElement<NODE, T> lastElement = tail(stack);
+            final StackElement<NODE, T> lastElement = tail(stack);
             if(lastElement.childrenIterator != null  && lastElement.childrenIterator.hasNext()) {
-                NODE childNode = lastElement.childrenIterator.next();
-                StackElement<NODE, T> childStackElement =
+                final NODE childNode = lastElement.childrenIterator.next();
+                final StackElement<NODE, T> childStackElement =
                         new StackElement<>(childNode);
                 stack.add(childStackElement);
                 switch (visitor.visitPre(publicStack)) {
diff --git a/src/main/java/net/woggioni/jwo/Tuple2.java b/src/main/java/net/woggioni/jwo/Tuple2.java
index 60678b7..50432ee 100644
--- a/src/main/java/net/woggioni/jwo/Tuple2.java
+++ b/src/main/java/net/woggioni/jwo/Tuple2.java
@@ -9,17 +9,17 @@ public interface Tuple2<T, U> {
     T get_1();
     U get_2();
 
-    static <T,U> Tuple2<T, U> newInstance(T x, U y) {
+    static <T,U> Tuple2<T, U> newInstance(final T x, final U y) {
         return new Tuple2Impl<>(x, y);
     }
 
-    static <X extends Comparable<X>, Y extends Comparable<Y>> Comparator<Tuple2<X, Y>> getComparator(Class<X> cls1, Class<Y> cls2) {
+    static <X extends Comparable<X>, Y extends Comparable<Y>> Comparator<Tuple2<X, Y>> getComparator(final Class<X> cls1, final Class<Y> cls2) {
         return Comparator
                 .comparing((Function<Tuple2<X, Y>, X>) Tuple2::get_1)
                 .thenComparing(Tuple2::get_2);
     }
 
-    static <X extends Comparable<X>, Y extends Comparable<Y>> Comparator<Tuple2<X, Y>> getComparator(Tuple2<X, Y> tuple) {
+    static <X extends Comparable<X>, Y extends Comparable<Y>> Comparator<Tuple2<X, Y>> getComparator(final Tuple2<X, Y> tuple) {
         return Comparator
                 .comparing((Function<Tuple2<X, Y>, X>) Tuple2::get_1)
                 .thenComparing(Tuple2::get_2);
diff --git a/src/main/java/net/woggioni/jwo/Tuple3.java b/src/main/java/net/woggioni/jwo/Tuple3.java
index e5c18df..5182c9a 100644
--- a/src/main/java/net/woggioni/jwo/Tuple3.java
+++ b/src/main/java/net/woggioni/jwo/Tuple3.java
@@ -9,12 +9,12 @@ public interface Tuple3<T, U, V> {
     U get_2();
     V get_3();
 
-    static <T, U, V> Tuple3<T, U, V> newInstance(T x, U y, V z) {
+    static <T, U, V> Tuple3<T, U, V> newInstance(final T x, final U y, final V z) {
         return new Tuple3Impl<>(x, y, z);
     }
 
     static <X extends Comparable<X>, Y extends Comparable<Y>, Z extends Comparable<Z>>
-    Comparator<Tuple3<X, Y, Z>> getComparator(Class<X> cls1, Class<Y> cls2, Class<Z> cls3) {
+    Comparator<Tuple3<X, Y, Z>> getComparator(final Class<X> cls1, final Class<Y> cls2, final Class<Z> cls3) {
         return Comparator
                 .comparing((Tuple3<X, Y, Z> t) -> t.get_1())
                 .thenComparing((Tuple3<X, Y, Z> t) -> t.get_2())
@@ -22,7 +22,7 @@ public interface Tuple3<T, U, V> {
     }
 
     static <X extends Comparable<X>, Y extends Comparable<Y>, Z extends Comparable<Z>>
-    Comparator<Tuple3<X, Y, Z>> getComparator(Tuple3<X, Y, Z> tuple) {
+    Comparator<Tuple3<X, Y, Z>> getComparator(final Tuple3<X, Y, Z> tuple) {
         return Comparator
                 .comparing((Tuple3<X, Y, Z> t) -> t.get_1())
                 .thenComparing((Tuple3<X, Y, Z> t) -> t.get_2())
diff --git a/src/main/java/net/woggioni/jwo/UncloseableInputStream.java b/src/main/java/net/woggioni/jwo/UncloseableInputStream.java
index 7b0cba1..d1a58c8 100644
--- a/src/main/java/net/woggioni/jwo/UncloseableInputStream.java
+++ b/src/main/java/net/woggioni/jwo/UncloseableInputStream.java
@@ -10,7 +10,7 @@ import java.io.InputStream;
  */
 public class UncloseableInputStream extends FilterInputStream {
 
-    public UncloseableInputStream(InputStream source) {
+    public UncloseableInputStream(final InputStream source) {
         super(source);
     }
 
diff --git a/src/main/java/net/woggioni/jwo/UncloseableOutputStream.java b/src/main/java/net/woggioni/jwo/UncloseableOutputStream.java
index 1a28b77..48a08e7 100644
--- a/src/main/java/net/woggioni/jwo/UncloseableOutputStream.java
+++ b/src/main/java/net/woggioni/jwo/UncloseableOutputStream.java
@@ -10,7 +10,7 @@ import java.io.OutputStream;
  */
 public class UncloseableOutputStream extends FilterOutputStream {
 
-    public UncloseableOutputStream(OutputStream source) {
+    public UncloseableOutputStream(final OutputStream source) {
         super(source);
     }
 
diff --git a/src/main/java/net/woggioni/jwo/UncloseableWriter.java b/src/main/java/net/woggioni/jwo/UncloseableWriter.java
index b62eab5..297c6ea 100644
--- a/src/main/java/net/woggioni/jwo/UncloseableWriter.java
+++ b/src/main/java/net/woggioni/jwo/UncloseableWriter.java
@@ -5,7 +5,7 @@ import java.io.IOException;
 import java.io.Writer;
 
 public class UncloseableWriter extends FilterWriter {
-    public UncloseableWriter(Writer destination) {
+    public UncloseableWriter(final Writer destination) {
         super(destination);
     }
 
diff --git a/src/main/java/net/woggioni/jwo/UnmodifiableDelegatingMap.java b/src/main/java/net/woggioni/jwo/UnmodifiableDelegatingMap.java
index 455f3d7..32e6ecc 100644
--- a/src/main/java/net/woggioni/jwo/UnmodifiableDelegatingMap.java
+++ b/src/main/java/net/woggioni/jwo/UnmodifiableDelegatingMap.java
@@ -18,8 +18,8 @@ public class UnmodifiableDelegatingMap<K, V> implements Map<K, V> {
     private final List<Map<K, V>> delegates;
 
     public static <K, V> UnmodifiableDelegatingMap<K, V> of(
-        Supplier<Map<K, V>> mapFactory,
-        Map<K, V>... delegates
+            final Supplier<Map<K, V>> mapFactory,
+            final Map<K, V>... delegates
     ) {
         return new UnmodifiableDelegatingMap<>(mapFactory, Arrays.asList(delegates));
     }
@@ -31,7 +31,7 @@ public class UnmodifiableDelegatingMap<K, V> implements Map<K, V> {
 
     @Override
     public boolean isEmpty() {
-        for (Map<K, V> delegate : delegates) {
+        for (final Map<K, V> delegate : delegates) {
             if (!delegate.isEmpty()) {
                 return false;
             }
@@ -40,8 +40,8 @@ public class UnmodifiableDelegatingMap<K, V> implements Map<K, V> {
     }
 
     @Override
-    public boolean containsKey(Object key) {
-        for (Map<K, V> delegate : delegates) {
+    public boolean containsKey(final Object key) {
+        for (final Map<K, V> delegate : delegates) {
             if (delegate.containsKey(key)) {
                 return true;
             }
@@ -50,8 +50,8 @@ public class UnmodifiableDelegatingMap<K, V> implements Map<K, V> {
     }
 
     @Override
-    public boolean containsValue(Object value) {
-        for (Map<K, V> delegate : delegates) {
+    public boolean containsValue(final Object value) {
+        for (final Map<K, V> delegate : delegates) {
             if (delegate.containsValue(value)) {
                 return true;
             }
@@ -60,9 +60,9 @@ public class UnmodifiableDelegatingMap<K, V> implements Map<K, V> {
     }
 
     @Override
-    public V get(Object key) {
+    public V get(final Object key) {
         V result = null;
-        for (Map<K, V> delegate : delegates) {
+        for (final Map<K, V> delegate : delegates) {
             result = delegate.get(key);
             if (result != null) break;
         }
@@ -70,17 +70,17 @@ public class UnmodifiableDelegatingMap<K, V> implements Map<K, V> {
     }
 
     @Override
-    public V put(K key, V value) {
+    public V put(final K key, final V value) {
         throw newThrowable(UnsupportedOperationException.class);
     }
 
     @Override
-    public V remove(Object key) {
+    public V remove(final Object key) {
         throw newThrowable(UnsupportedOperationException.class);
     }
 
     @Override
-    public void putAll(Map<? extends K, ? extends V> m) {
+    public void putAll(final Map<? extends K, ? extends V> m) {
         throw newThrowable(UnsupportedOperationException.class);
     }
 
diff --git a/src/main/java/net/woggioni/jwo/VersionComparator.java b/src/main/java/net/woggioni/jwo/VersionComparator.java
index c764012..9af9e49 100644
--- a/src/main/java/net/woggioni/jwo/VersionComparator.java
+++ b/src/main/java/net/woggioni/jwo/VersionComparator.java
@@ -6,7 +6,7 @@ import java.util.Objects;
 
 public class VersionComparator implements Comparator<String> {
 
-    private static int indexOf(char[] haystack, char needle, int start) {
+    private static int indexOf(final char[] haystack, final char needle, final int start) {
         int result = -1;
         for (int i = start; i < haystack.length; ++i) {
             if (haystack[i] == needle) {
@@ -17,12 +17,12 @@ public class VersionComparator implements Comparator<String> {
         return result;
     }
 
-    private static int indexOf(char[] haystack, char needle) {
+    private static int indexOf(final char[] haystack, final char needle) {
         return indexOf(haystack, needle, 0);
     }
 
-    private static char[] cstring(String s) {
-        char[] result = new char[s.length() + 1];
+    private static char[] cstring(final String s) {
+        final char[] result = new char[s.length() + 1];
         for(int i=0; i<s.length(); i++) {
             result[i] = s.charAt(i);
         }
@@ -30,11 +30,11 @@ public class VersionComparator implements Comparator<String> {
         return result;
     }
 
-    private static boolean cstringEquals(char[] cstring1, int begin1, char[] cstring2, int begin2) {
+    private static boolean cstringEquals(final char[] cstring1, final int begin1, final char[] cstring2, final int begin2) {
         int i=0;
         while(i < cstring1.length + begin1 || i < cstring2.length + begin2) {
-            char c1 = cstring1[begin1 + i];
-            char c2 = cstring2[begin2 + i];
+            final char c1 = cstring1[begin1 + i];
+            final char c2 = cstring2[begin2 + i];
             if(c1 != c2) return false;
             else if(c1 == '\0') break;
             i++;
@@ -42,7 +42,7 @@ public class VersionComparator implements Comparator<String> {
         return true;
     }
 
-    private static int strlen(char[] cstring, int begin) {
+    private static int strlen(final char[] cstring, final int begin) {
         int i = begin;
         while(i < cstring.length) {
             if(cstring[i] == '\0') break;
@@ -51,16 +51,16 @@ public class VersionComparator implements Comparator<String> {
         return i - begin;
     }
 
-    private static int strlen(char[] cstring) {
+    private static int strlen(final char[] cstring) {
         return strlen(cstring, 0);
     }
 
-    private static int strcmp(char[] cstring1, int begin1, char[] cstring2, int begin2) {
+    private static int strcmp(final char[] cstring1, final int begin1, final char[] cstring2, final int begin2) {
         int i = 0;
-        int lim = Math.min(strlen(cstring1, begin1), strlen(cstring2, begin2));
+        final int lim = Math.min(strlen(cstring1, begin1), strlen(cstring2, begin2));
         while(i < lim) {
-            char c1 = cstring1[begin1 + i];
-            char c2 = cstring2[begin2 + i];
+            final char c1 = cstring1[begin1 + i];
+            final char c2 = cstring2[begin2 + i];
             if(c1 < c2) {
                 return -1;
             } else if(c1 > c2) {
@@ -76,7 +76,7 @@ public class VersionComparator implements Comparator<String> {
      * @param text		[epoch:]version[-release] string
      * @param evr		array that will contain starting indexes of epoch, version, and release
      */
-    private static void parseEVR(char[] text, int[] evr) {
+    private static void parseEVR(final char[] text, final int[] evr) {
         int epoch;
         int version;
         int release;
@@ -111,11 +111,11 @@ public class VersionComparator implements Comparator<String> {
     }
 
 
-    private static int rpmvercmp(char[] chars1, int start1, char[] chars2, int start2) {
+    private static int rpmvercmp(final char[] chars1, final int start1, final char[] chars2, final int start2) {
         // easy comparison to see if versions are identical
         if(strcmp(chars1, start1, chars2, start2) == 0) return 0;
-        char[] str1 = Arrays.copyOfRange(chars1, start1, start1 + strlen(chars1, start1) + 1);
-        char[] str2 = Arrays.copyOfRange(chars2, start2, start2 + strlen(chars2, start2) + 1);
+        final char[] str1 = Arrays.copyOfRange(chars1, start1, start1 + strlen(chars1, start1) + 1);
+        final char[] str2 = Arrays.copyOfRange(chars2, start2, start2 + strlen(chars2, start2) + 1);
         int one = 0, two = 0;
         int ptr1 = 0, ptr2 = 0;
         boolean isNum;
@@ -207,8 +207,8 @@ public class VersionComparator implements Comparator<String> {
                 while (str2[two] == '0') two++;
 
                 /* whichever number has more digits wins */
-                int len1 = strlen(str1, one);
-                int len2 = strlen(str2, two);
+                final int len1 = strlen(str1, one);
+                final int len2 = strlen(str2, two);
                 if (len1 > len2) {
                     return 1;
                 } else if (len2 > len1) {
@@ -219,7 +219,7 @@ public class VersionComparator implements Comparator<String> {
             // segments are alpha or if they are numeric.  don't return
             // if they are equal because there might be more segments to
             // compare
-            int rc = strcmp(str1, one, str2, two);
+            final int rc = strcmp(str1, one, str2, two);
             if (rc != 0) return rc;
 
             // restore character that was replaced by null above
@@ -252,26 +252,26 @@ public class VersionComparator implements Comparator<String> {
 
     private static char[] defaultEpoch = new char[] {'0'};
 
-    public static int cmp(String v1, String v2) {
+    public static int cmp(final String v1, final String v2) {
         if(v1 == null && v2 == null) return 0;
         else if(v1 == null) return -1;
         else if(v2 == null) return 1;
         else if(Objects.equals(v1, v2)) return 0;
 
-        char[] chars1 = cstring(v1);
-        char[] chars2 = cstring(v2);
-        int[] evr = new int[3];
+        final char[] chars1 = cstring(v1);
+        final char[] chars2 = cstring(v2);
+        final int[] evr = new int[3];
         parseEVR(chars1, evr);
-        int epoch1 = evr[0];
-        int version1 = evr[1];
-        int release1 = evr[2];
+        final int epoch1 = evr[0];
+        final int version1 = evr[1];
+        final int release1 = evr[2];
         parseEVR(chars2, evr);
-        int epoch2 = evr[0];
-        int version2 = evr[1];
-        int release2 = evr[2];
+        final int epoch2 = evr[0];
+        final int version2 = evr[1];
+        final int release2 = evr[2];
 
-        char[] seq1 = epoch1 == -1 ? defaultEpoch : chars1;
-        char[] seq2 = epoch2 == -1 ? defaultEpoch : chars2;
+        final char[] seq1 = epoch1 == -1 ? defaultEpoch : chars1;
+        final char[] seq2 = epoch2 == -1 ? defaultEpoch : chars2;
         int ret = rpmvercmp(seq1, epoch1 == -1 ? 0 : epoch1, seq2, epoch2 == -1 ? 0 : epoch2);
         if(ret == 0) {
             ret = rpmvercmp(chars1, version1, chars2, version2);
@@ -283,7 +283,7 @@ public class VersionComparator implements Comparator<String> {
     }
 
     @Override
-    public int compare(String v1, String v2) {
+    public int compare(final String v1, final String v2) {
         return cmp(v1, v2);
     }
 }
diff --git a/src/main/java/net/woggioni/jwo/ZipExtractorInputStream.java b/src/main/java/net/woggioni/jwo/ZipExtractorInputStream.java
index 854a7fd..43e58bb 100644
--- a/src/main/java/net/woggioni/jwo/ZipExtractorInputStream.java
+++ b/src/main/java/net/woggioni/jwo/ZipExtractorInputStream.java
@@ -13,7 +13,7 @@ import java.util.zip.ZipInputStream;
  */
 public class ZipExtractorInputStream extends ZipInputStream {
 
-    public ZipExtractorInputStream(InputStream source, Path destination) {
+    public ZipExtractorInputStream(final InputStream source, final Path destination) {
         super(source);
         this.destination = destination;
     }
@@ -24,9 +24,9 @@ public class ZipExtractorInputStream extends ZipInputStream {
 
     @Override
     public ZipEntry getNextEntry() throws IOException {
-        ZipEntry entry = super.getNextEntry();
+        final ZipEntry entry = super.getNextEntry();
         if(entry != null) {
-            Path newFileSystemLocation = destination.resolve(entry.getName());
+            final Path newFileSystemLocation = destination.resolve(entry.getName());
             if(entry.isDirectory()) {
                 Files.createDirectories(newFileSystemLocation);
             } else {
@@ -39,14 +39,14 @@ public class ZipExtractorInputStream extends ZipInputStream {
 
     @Override
     public int read() throws IOException {
-        int result = super.read();
+        final int result = super.read();
         if(result != -1 && currentFile != null) currentFile.write(result);
         return result;
     }
 
     @Override
-    public int read(byte[] b, int off, int len) throws IOException {
-        int read = super.read(b, off, len);
+    public int read(final byte[] b, final int off, final int len) throws IOException {
+        final int read = super.read(b, off, len);
         if(read != -1 && currentFile != null) currentFile.write(b, off, read);
         return read;
     }
diff --git a/src/main/java/net/woggioni/jwo/compression/CompressionInputStream.java b/src/main/java/net/woggioni/jwo/compression/CompressionInputStream.java
index acbfa91..66cb6bd 100644
--- a/src/main/java/net/woggioni/jwo/compression/CompressionInputStream.java
+++ b/src/main/java/net/woggioni/jwo/compression/CompressionInputStream.java
@@ -12,20 +12,20 @@ public class CompressionInputStream extends InputStream {
     private final Thread writer;
     private final InputStream processOutput;
 
-    public CompressionInputStream(InputStream is, CompressionFormat compressionFormat) {
+    public CompressionInputStream(final InputStream is, final CompressionFormat compressionFormat) {
         this(is, compressionFormat, StreamMode.COMPRESSION);
     }
 
-    public CompressionInputStream(InputStream is, CompressionFormat compressionFormat, Integer level) {
+    public CompressionInputStream(final InputStream is, final CompressionFormat compressionFormat, final Integer level) {
         this(is, compressionFormat, StreamMode.COMPRESSION, level);
     }
 
-    public CompressionInputStream(InputStream is, CompressionFormat compressionFormat, StreamMode mode) {
+    public CompressionInputStream(final InputStream is, final CompressionFormat compressionFormat, final StreamMode mode) {
         this(is, compressionFormat, mode, null);
     }
 
     @SneakyThrows
-    public CompressionInputStream(InputStream is, CompressionFormat compressionFormat, StreamMode mode, Integer level) {
+    public CompressionInputStream(final InputStream is, final CompressionFormat compressionFormat, final StreamMode mode, final Integer level) {
         inputStream = is;
         String[] cliArgs;
         switch(mode) {
@@ -42,10 +42,10 @@ public class CompressionInputStream extends InputStream {
             default:
                 throw new NullPointerException();
         }
-        ProcessBuilder pb = new ProcessBuilder(cliArgs);
+        final ProcessBuilder pb = new ProcessBuilder(cliArgs);
         process = pb.start();
         processOutput = process.getInputStream();
-        StreamWriter streamWriter = new StreamWriter(inputStream, process.getOutputStream());
+        final StreamWriter streamWriter = new StreamWriter(inputStream, process.getOutputStream());
         writer = new Thread(streamWriter);
         writer.start();
     }
@@ -56,7 +56,7 @@ public class CompressionInputStream extends InputStream {
     }
 
     @Override
-    public int read(byte[] bytes, int i, int i1) throws IOException {
+    public int read(final byte[] bytes, final int i, final int i1) throws IOException {
         return processOutput.read(bytes, i, i1);
     }
 
diff --git a/src/main/java/net/woggioni/jwo/compression/CompressionOutputStream.java b/src/main/java/net/woggioni/jwo/compression/CompressionOutputStream.java
index 97b8d43..5cca84c 100644
--- a/src/main/java/net/woggioni/jwo/compression/CompressionOutputStream.java
+++ b/src/main/java/net/woggioni/jwo/compression/CompressionOutputStream.java
@@ -11,20 +11,20 @@ public class CompressionOutputStream extends OutputStream {
     private final Thread writer;
     private final OutputStream processInput;
 
-    public CompressionOutputStream(OutputStream os, CompressionFormat compressionFormat) {
+    public CompressionOutputStream(final OutputStream os, final CompressionFormat compressionFormat) {
         this(os, compressionFormat, StreamMode.COMPRESSION);
     }
 
-    public CompressionOutputStream(OutputStream os, CompressionFormat compressionFormat, Integer level) {
+    public CompressionOutputStream(final OutputStream os, final CompressionFormat compressionFormat, final Integer level) {
         this(os, compressionFormat, StreamMode.COMPRESSION, level);
     }
 
-    public CompressionOutputStream(OutputStream os, CompressionFormat compressionFormat, StreamMode mode) {
+    public CompressionOutputStream(final OutputStream os, final CompressionFormat compressionFormat, final StreamMode mode) {
         this(os, compressionFormat, mode, null);
     }
 
     @SneakyThrows
-    public CompressionOutputStream(OutputStream os, CompressionFormat compressionFormat, StreamMode mode, Integer level) {
+    public CompressionOutputStream(final OutputStream os, final CompressionFormat compressionFormat, final StreamMode mode, final Integer level) {
         outputStream = os;
         String[] cliArgs;
         switch(mode) {
@@ -41,23 +41,23 @@ public class CompressionOutputStream extends OutputStream {
             default:
                 throw new NullPointerException();
         }
-        ProcessBuilder pb = new ProcessBuilder(cliArgs);
+        final ProcessBuilder pb = new ProcessBuilder(cliArgs);
         process = pb.start();
         processInput = process.getOutputStream();
-        StreamWriter streamWriter = new StreamWriter(process.getInputStream(), outputStream);
+        final StreamWriter streamWriter = new StreamWriter(process.getInputStream(), outputStream);
         writer = new Thread(streamWriter);
         writer.start();
     }
 
     @Override
     @SneakyThrows
-    public void write(byte[] buffer, int offset, int size) {
+    public void write(final byte[] buffer, final int offset, final int size) {
         processInput.write(buffer, offset, size);
     }
 
     @Override
     @SneakyThrows
-    public void write(int i) {
+    public void write(final int i) {
         processInput.write(i);
     }
 
diff --git a/src/main/java/net/woggioni/jwo/exception/ChildProcessException.java b/src/main/java/net/woggioni/jwo/exception/ChildProcessException.java
index f42a843..3792176 100644
--- a/src/main/java/net/woggioni/jwo/exception/ChildProcessException.java
+++ b/src/main/java/net/woggioni/jwo/exception/ChildProcessException.java
@@ -6,14 +6,14 @@ import java.util.stream.Collectors;
 
 public class ChildProcessException extends RuntimeException {
 
-    private static final String cmdLine2str(Iterable<String> cmdLine) {
+    private static final String cmdLine2str(final Iterable<String> cmdLine) {
         return JWO.iterable2Stream(cmdLine)
             .map(it -> it.replace("\"", "\\\""))
             .map(it -> "\"" + it + "\"")
             .collect(Collectors.joining(", "));
     }
 
-    public ChildProcessException(Iterable<String> cmdline, int exitCode) {
+    public ChildProcessException(final Iterable<String> cmdline, final int exitCode) {
         super(String.format("Child process [%s] terminated with exit code %d", cmdLine2str(cmdline), exitCode));
     }
 }
diff --git a/src/main/java/net/woggioni/jwo/internal/ByteFilterInputStream.java b/src/main/java/net/woggioni/jwo/internal/ByteFilterInputStream.java
index 83ced88..9e993cf 100644
--- a/src/main/java/net/woggioni/jwo/internal/ByteFilterInputStream.java
+++ b/src/main/java/net/woggioni/jwo/internal/ByteFilterInputStream.java
@@ -14,7 +14,7 @@ public class ByteFilterInputStream extends FilterInputStream {
 
     private final Set<Byte> forbidden;
 
-    public ByteFilterInputStream(InputStream source, Iterable<Byte> filteredChars) {
+    public ByteFilterInputStream(final InputStream source, final Iterable<Byte> filteredChars) {
         super(source);
         forbidden = JWO.iterable2Stream(filteredChars).collect(CollectionUtils.toUnmodifiableTreeSet());
     }
@@ -23,7 +23,7 @@ public class ByteFilterInputStream extends FilterInputStream {
     @Override
     public int read() throws IOException {
         while(true) {
-            int res = super.read();
+            final int res = super.read();
             if(!forbidden.contains(res)) {
                 return res;
             }
@@ -31,17 +31,17 @@ public class ByteFilterInputStream extends FilterInputStream {
     }
 
     @Override
-    public int read(byte[] b) throws IOException {
+    public int read(final byte[] b) throws IOException {
         return read(b, 0, b.length);
     }
 
     @Override
-    public int read(byte[] b, int off, int len) throws IOException {
+    public int read(final byte[] b, final int off, final int len) throws IOException {
         if(finished) return -1;
         int i = 0;
-        int lim = Math.min(len, b.length - off);
+        final int lim = Math.min(len, b.length - off);
         while(i < lim) {
-            int c = read();
+            final int c = read();
             if(c < 0) {
                 break;
             }
diff --git a/src/main/java/net/woggioni/jwo/internal/CharFilterReader.java b/src/main/java/net/woggioni/jwo/internal/CharFilterReader.java
index 48ed402..731406b 100644
--- a/src/main/java/net/woggioni/jwo/internal/CharFilterReader.java
+++ b/src/main/java/net/woggioni/jwo/internal/CharFilterReader.java
@@ -16,12 +16,12 @@ public class CharFilterReader extends FilterReader {
 
     private final Set<Character> forbidden;
 
-    public CharFilterReader(Reader source, Iterable<Character> filteredChars) {
+    public CharFilterReader(final Reader source, final Iterable<Character> filteredChars) {
         super(source);
         forbidden = JWO.iterable2Stream(filteredChars).collect(CollectionUtils.toUnmodifiableTreeSet());
     }
 
-    public CharFilterReader(Reader source, Character ...filteredChars) {
+    public CharFilterReader(final Reader source, final Character ...filteredChars) {
         super(source);
         forbidden = Arrays.stream(filteredChars).collect(CollectionUtils.toUnmodifiableTreeSet());
     }
@@ -30,7 +30,7 @@ public class CharFilterReader extends FilterReader {
     @Override
     public int read() throws IOException {
         while(true) {
-            int res = super.read();
+            final int res = super.read();
             if(!forbidden.contains((char) res)) {
                 return res;
             }
@@ -38,12 +38,12 @@ public class CharFilterReader extends FilterReader {
     }
 
     @Override
-    public int read(char[] cbuf, int off, int len) throws IOException {
+    public int read(final char[] cbuf, final int off, final int len) throws IOException {
         if(finished) return -1;
         int i = 0;
-        int lim = Math.min(len, cbuf.length - off);
+        final int lim = Math.min(len, cbuf.length - off);
         while(i < lim) {
-            int c = read();
+            final int c = read();
             if(c < 0) {
                 break;
             }
@@ -55,12 +55,12 @@ public class CharFilterReader extends FilterReader {
     }
 
     @Override
-    public int read(CharBuffer target) throws IOException {
+    public int read(final CharBuffer target) throws IOException {
         return read(target.array());
     }
 
     @Override
-    public int read(char[] cbuf) throws IOException {
+    public int read(final char[] cbuf) throws IOException {
         return read(cbuf, 0, cbuf.length);
     }
 }
diff --git a/src/main/java/net/woggioni/jwo/internal/LocalBucket.java b/src/main/java/net/woggioni/jwo/internal/LocalBucket.java
index 7591590..2815356 100644
--- a/src/main/java/net/woggioni/jwo/internal/LocalBucket.java
+++ b/src/main/java/net/woggioni/jwo/internal/LocalBucket.java
@@ -16,15 +16,15 @@ public class LocalBucket implements Bucket {
     private final AtomicLong availableTokens;
     private final AtomicLong lastFill;
 
-    public LocalBucket(long maxCapacity, long fillAmount, long fillPeriod) {
+    public LocalBucket(final long maxCapacity, final long fillAmount, final long fillPeriod) {
         this(maxCapacity, fillAmount, fillPeriod, maxCapacity);
     }
 
-    public LocalBucket(long maxCapacity, long fillAmount, long fillPeriod, long initialAmount) {
+    public LocalBucket(final long maxCapacity, final long fillAmount, final long fillPeriod, final long initialAmount) {
         this(maxCapacity, fillAmount, fillPeriod, initialAmount, System.nanoTime());
     }
 
-    public LocalBucket(long maxCapacity, long fillAmount, long fillPeriod, long initialAmount, long currentTimestamp) {
+    public LocalBucket(final long maxCapacity, final long fillAmount, final long fillPeriod, final long initialAmount, final long currentTimestamp) {
         if (maxCapacity <= 0 || fillAmount <= 0 || fillPeriod <= 0) {
             throw new IllegalArgumentException("maxCapacity, fillAmount and fillPeriod must all be positive");
         }
@@ -35,7 +35,7 @@ public class LocalBucket implements Bucket {
         this.lastFill = new AtomicLong(currentTimestamp);
     }
 
-    private long getTokenPrivate(long nTokens, long now, long previousFillTime, long currentFillTime) {
+    private long getTokenPrivate(final long nTokens, final long now, final long previousFillTime, final long currentFillTime) {
         final LongBinaryOperator tickCalculator = (lf, currentTimestamp) -> (currentTimestamp - lf) / fillPeriod;
         if (currentFillTime != previousFillTime) {
             final long ticks = tickCalculator.applyAsLong(previousFillTime, now);
@@ -65,34 +65,34 @@ public class LocalBucket implements Bucket {
 
 
     @Override
-    public boolean removeTokens(long nTokens) {
+    public boolean removeTokens(final long nTokens) {
         return removeTokens(nTokens, System.nanoTime());
     }
 
     @Override
-    public boolean removeTokens(long nTokens, long now) {
+    public boolean removeTokens(final long nTokens, final long now) {
         if(nTokens > maxCapacity) throw new IllegalArgumentException("The requested number of tokens exceeds the bucket max capacity");
         final LongBinaryOperator tickCalculator = (lf, currentTimestamp) -> (currentTimestamp - lf) / fillPeriod;
         final LongBinaryOperator timestampCalculator = (lf, currentTimestamp) -> lf + tickCalculator.applyAsLong(lf, currentTimestamp) * fillPeriod;
         final long previousFillTime = lastFill.getAndAccumulate(now, timestampCalculator);
         final long currentFillTime = timestampCalculator.applyAsLong(previousFillTime, now);
-        long result = getTokenPrivate(nTokens, now, previousFillTime, currentFillTime);
+        final long result = getTokenPrivate(nTokens, now, previousFillTime, currentFillTime);
         return result >= nTokens;
     }
 
     @Override
-    public long removeTokensWithEstimate(long nTokens) {
+    public long removeTokensWithEstimate(final long nTokens) {
         return removeTokensWithEstimate(nTokens, System.nanoTime());
     }
 
     @Override
-    public long removeTokensWithEstimate(long nTokens, long now) {
+    public long removeTokensWithEstimate(final long nTokens, final long now) {
         if(nTokens > maxCapacity) throw new IllegalArgumentException("The requested number of tokens exceeds the bucket max capacity");
         final LongBinaryOperator tickCalculator = (lf, currentTimestamp) -> (currentTimestamp - lf) / fillPeriod;
         final LongBinaryOperator timestampCalculator = (lf, currentTimestamp) -> lf + tickCalculator.applyAsLong(lf, currentTimestamp) * fillPeriod;
         final long previousFillTime = lastFill.getAndAccumulate(now, timestampCalculator);
         final long currentFillTime = timestampCalculator.applyAsLong(previousFillTime, now);
-        long previousTokenAmount = getTokenPrivate(nTokens, now, previousFillTime, currentFillTime);
+        final long previousTokenAmount = getTokenPrivate(nTokens, now, previousFillTime, currentFillTime);
         if(previousTokenAmount >= nTokens) {
             return -1;
         } else {
diff --git a/src/main/java/net/woggioni/jwo/internal/SynchronizedLazyValue.java b/src/main/java/net/woggioni/jwo/internal/SynchronizedLazyValue.java
index 86a416d..5ce57af 100644
--- a/src/main/java/net/woggioni/jwo/internal/SynchronizedLazyValue.java
+++ b/src/main/java/net/woggioni/jwo/internal/SynchronizedLazyValue.java
@@ -18,12 +18,12 @@ public class SynchronizedLazyValue<T> implements LazyValue<T> {
     private final Consumer<T> finalizer;
     private final MutableTuple2<T, Boolean> instance = MutableTuple2.newInstance(null, false);
 
-    public SynchronizedLazyValue(Supplier<T> valueSupplier) {
+    public SynchronizedLazyValue(final Supplier<T> valueSupplier) {
         this(valueSupplier, null);
     }
 
     @Override
-    public <U> LazyValue<U> map(Function<T, U> fun) {
+    public <U> LazyValue<U> map(final Function<T, U> fun) {
         return new SynchronizedLazyValue<>(() -> fun.apply(get()));
     }
 
@@ -37,7 +37,7 @@ public class SynchronizedLazyValue<T> implements LazyValue<T> {
         synchronized (instance) {
             if(instance.get_2()) return instance.get_1();
             else {
-                T value = valueSupplier.get();
+                final T value = valueSupplier.get();
                 instance.set_1(value);
                 instance.set_2(true);
                 return value;
@@ -46,11 +46,11 @@ public class SynchronizedLazyValue<T> implements LazyValue<T> {
     }
 
     @Override
-    public <U> SynchronizedLazyValue<U> handle(BiFunction<T, Throwable, U> bicon) {
+    public <U> SynchronizedLazyValue<U> handle(final BiFunction<T, Throwable, U> bicon) {
         return new SynchronizedLazyValue<>(() -> {
             try {
                 return bicon.apply(get(), null);
-            } catch (Throwable t) {
+            } catch (final Throwable t) {
                 return bicon.apply(null, t);
             }
         });
diff --git a/src/main/java/net/woggioni/jwo/internal/UnsynchronizedLazyValue.java b/src/main/java/net/woggioni/jwo/internal/UnsynchronizedLazyValue.java
index ecc331c..1851260 100644
--- a/src/main/java/net/woggioni/jwo/internal/UnsynchronizedLazyValue.java
+++ b/src/main/java/net/woggioni/jwo/internal/UnsynchronizedLazyValue.java
@@ -18,12 +18,12 @@ public class UnsynchronizedLazyValue<T> implements LazyValue<T> {
     private final Consumer<T> finalizer;
     private final MutableTuple2<T, Boolean> instance = MutableTuple2.newInstance(null, false);
 
-    public UnsynchronizedLazyValue(Supplier<T> valueSupplier) {
+    public UnsynchronizedLazyValue(final Supplier<T> valueSupplier) {
         this(valueSupplier, null);
     }
 
     @Override
-    public <U> LazyValue<U> map(Function<T, U> fun) {
+    public <U> LazyValue<U> map(final Function<T, U> fun) {
         return new UnsynchronizedLazyValue<>(() -> fun.apply(get()));
     }
 
@@ -35,7 +35,7 @@ public class UnsynchronizedLazyValue<T> implements LazyValue<T> {
     public T get() {
         if(instance.get_2()) return instance.get_1();
         else {
-            T value = valueSupplier.get();
+            final T value = valueSupplier.get();
             instance.set_1(value);
             instance.set_2(true);
             return value;
@@ -43,11 +43,11 @@ public class UnsynchronizedLazyValue<T> implements LazyValue<T> {
     }
 
     @Override
-    public <U> UnsynchronizedLazyValue<U> handle(BiFunction<T, Throwable, U> bicon) {
+    public <U> UnsynchronizedLazyValue<U> handle(final BiFunction<T, Throwable, U> bicon) {
         return new UnsynchronizedLazyValue<>(() -> {
             try {
                 return bicon.apply(get(), null);
-            } catch (Throwable t) {
+            } catch (final Throwable t) {
                 return bicon.apply(null, t);
             }
         });
diff --git a/src/main/java/net/woggioni/jwo/url/classpath/Handler.java b/src/main/java/net/woggioni/jwo/url/classpath/Handler.java
index 68ff75b..0d1c0de 100644
--- a/src/main/java/net/woggioni/jwo/url/classpath/Handler.java
+++ b/src/main/java/net/woggioni/jwo/url/classpath/Handler.java
@@ -12,12 +12,12 @@ public class Handler extends URLStreamHandler {
         this.classLoader = getClass().getClassLoader();
     }
 
-    public Handler(ClassLoader classLoader) {
+    public Handler(final ClassLoader classLoader) {
         this.classLoader = classLoader;
     }
 
     @Override
-    protected URLConnection openConnection(URL u) throws IOException {
+    protected URLConnection openConnection(final URL u) throws IOException {
         final URL resourceUrl = classLoader.getResource(u.getPath());
         return resourceUrl.openConnection();
     }
diff --git a/src/main/java/net/woggioni/jwo/url/jpms/Handler.java b/src/main/java/net/woggioni/jwo/url/jpms/Handler.java
index 67dcab0..6273222 100644
--- a/src/main/java/net/woggioni/jwo/url/jpms/Handler.java
+++ b/src/main/java/net/woggioni/jwo/url/jpms/Handler.java
@@ -11,7 +11,7 @@ import java.util.Optional;
 public class Handler extends URLStreamHandler {
 
     @Override
-    protected URLConnection openConnection(URL u) throws IOException {
+    protected URLConnection openConnection(final URL u) throws IOException {
         final Module thisModule = getClass().getModule();
         final Module sourceModule = Optional.ofNullable(thisModule)
                 .map(Module::getLayer)
@@ -25,7 +25,7 @@ public class Handler extends URLStreamHandler {
     private static class ModuleResourceURLConnection extends URLConnection {
         private final Module module;
 
-        private ModuleResourceURLConnection(URL url, Module module) {
+        private ModuleResourceURLConnection(final URL url, final Module module) {
             super(url);
             this.module = module;
         }
diff --git a/src/main/java/net/woggioni/jwo/xml/DocumentWalker.java b/src/main/java/net/woggioni/jwo/xml/DocumentWalker.java
index 9e58354..a9db230 100644
--- a/src/main/java/net/woggioni/jwo/xml/DocumentWalker.java
+++ b/src/main/java/net/woggioni/jwo/xml/DocumentWalker.java
@@ -18,7 +18,7 @@ class StackElement {
     private final Node node;
     private final NodeListIterator iterator;
 
-    StackElement(Node node) {
+    StackElement(final Node node) {
         this.resultPre = null;
         this.node = node;
         this.iterator = new NodeListIterator(node.getChildNodes());
@@ -32,7 +32,7 @@ class Stack {
     private final List<Node> nodes = Collections.unmodifiableList(nodeStack);
 
 
-    public void push(Node node) {
+    public void push(final Node node) {
         stack.add(new StackElement(node));
         nodeStack.add(node);
     }
@@ -58,21 +58,21 @@ class Stack {
 @RequiredArgsConstructor
 public class DocumentWalker {
 
-    public static void walk(Node root, XMLNodeVisitor visitor) {
+    public static void walk(final Node root, final XMLNodeVisitor visitor) {
         new DocumentWalker(root).walk(visitor);
     }
 
     private final Node root;
 
-    public void walk(XMLNodeVisitor visitor) {
-        Stack stack = new Stack();
+    public void walk(final XMLNodeVisitor visitor) {
+        final Stack stack = new Stack();
         stack.push(root);
 
         loop:
         while(stack.isNotEmpty()) {
-            StackElement se = stack.last();
+            final StackElement se = stack.last();
             if(se.getIterator().hasNext()) {
-                Node childNode = se.getIterator().next();
+                final Node childNode = se.getIterator().next();
                 XMLNodeVisitor.NodeVisitResultPre result = se.getResultPre();
                 if(result == null) {
                     result = visitor.visitNodePre(stack.nodes());
@@ -88,7 +88,7 @@ public class DocumentWalker {
                         break loop;
                 }
             } else {
-                XMLNodeVisitor.NodeVisitResultPost result = visitor.visitNodePost(stack.nodes());
+                final XMLNodeVisitor.NodeVisitResultPost result = visitor.visitNodePost(stack.nodes());
                 stack.pop();
                 switch (result) {
                     case CONTINUE:
diff --git a/src/main/java/net/woggioni/jwo/xml/ElementBuilder.java b/src/main/java/net/woggioni/jwo/xml/ElementBuilder.java
index 445aa78..d2aa5a0 100644
--- a/src/main/java/net/woggioni/jwo/xml/ElementBuilder.java
+++ b/src/main/java/net/woggioni/jwo/xml/ElementBuilder.java
@@ -19,59 +19,57 @@ public class ElementBuilder {
     @Getter
     private final Element root;
 
-    public ElementBuilder node(String name) {
+    public ElementBuilder node(final String name) {
         return node(name, eb -> {
         });
     }
 
-    public ElementBuilder node(String name, Consumer<ElementBuilder> cb) {
-        Element child = doc.createElement(name);
+    public ElementBuilder node(final String name, final Consumer<ElementBuilder> cb) {
+        final Element child = doc.createElement(name);
         if(root == null) {
             doc.appendChild(child);
         } else {
             root.appendChild(child);
         }
-        ElementBuilder eb = new ElementBuilder(doc, child);
+        final ElementBuilder eb = new ElementBuilder(doc, child);
         cb.accept(eb);
         return eb;
     }
 
-    public final ElementBuilder node(String name, String textContent, Map<String, String> attrs) {
+    public final ElementBuilder node(final String name, final String textContent, final Map<String, String> attrs) {
         return node(name, eb -> {
             if(textContent != null) eb.text(textContent);
-            for(Map.Entry<String, String> attr : attrs.entrySet()) {
+            for(final Map.Entry<String, String> attr : attrs.entrySet()) {
                 eb.attr(attr.getKey(), attr.getValue());
             }
         });
     }
 
     @SafeVarargs
-    public final ElementBuilder node(String name, String textContent, Tuple2<String, String>...attrs) {
-        MapBuilder<String, String> mapBuilder = new MapBuilder<>();
-        for(Tuple2<String, String> attr : attrs) {
+    public final ElementBuilder node(final String name, final String textContent, final Tuple2<String, String>...attrs) {
+        final MapBuilder<String, String> mapBuilder = new MapBuilder<>();
+        for(final Tuple2<String, String> attr : attrs) {
             mapBuilder.entry(attr.get_1(), attr.get_2());
         }
         return node(name, textContent, mapBuilder.build(TreeMap::new));
     }
 
     @SafeVarargs
-    public final ElementBuilder node(String name, Tuple2<String, String>...attrs) {
+    public final ElementBuilder node(final String name, final Tuple2<String, String>...attrs) {
         return node(name, null, attrs);
     }
 
-    public final ElementBuilder node(String name, Map<String, String> attrs) {
+    public final ElementBuilder node(final String name, final Map<String, String> attrs) {
         return node(name, null, attrs);
     }
 
-    public ElementBuilder text(String textContent) {
+    public ElementBuilder text(final String textContent) {
         root.setTextContent(textContent);
         return this;
     }
 
-    public ElementBuilder attr(String name, String value) {
+    public ElementBuilder attr(final String name, final String value) {
         root.setAttribute(name, value);
         return this;
     }
-
-
 }
diff --git a/src/main/java/net/woggioni/jwo/xml/ElementIterator.java b/src/main/java/net/woggioni/jwo/xml/ElementIterator.java
index d942b2d..c2d8082 100644
--- a/src/main/java/net/woggioni/jwo/xml/ElementIterator.java
+++ b/src/main/java/net/woggioni/jwo/xml/ElementIterator.java
@@ -12,11 +12,11 @@ public class ElementIterator implements Iterator<Element> {
     private final String name;
     private Element next;
 
-    public ElementIterator(Element parent) {
+    public ElementIterator(final Element parent) {
         this(parent, null);
     }
 
-    public ElementIterator(Element parent, String name) {
+    public ElementIterator(final Element parent, final String name) {
         it = new NodeListIterator(parent.getChildNodes());
         this.name = name;
         next = getNext();
@@ -30,7 +30,7 @@ public class ElementIterator implements Iterator<Element> {
     @Override
     public Element next() {
         if(next == null) throw new NoSuchElementException();
-        Element result = next;
+        final Element result = next;
         next = getNext();
         return result;
     }
@@ -38,7 +38,7 @@ public class ElementIterator implements Iterator<Element> {
     private Element getNext() {
         Element result = null;
         while(it.hasNext()) {
-            Node node = it.next();
+            final Node node = it.next();
             if(node instanceof Element && (name == null || Objects.equals(name, ((Element) node).getTagName()))) {
                 result = (Element) node;
                 break;
diff --git a/src/main/java/net/woggioni/jwo/xml/XMLNodeVisitor.java b/src/main/java/net/woggioni/jwo/xml/XMLNodeVisitor.java
index 2d16889..12c45c3 100644
--- a/src/main/java/net/woggioni/jwo/xml/XMLNodeVisitor.java
+++ b/src/main/java/net/woggioni/jwo/xml/XMLNodeVisitor.java
@@ -6,11 +6,11 @@ import java.util.List;
 import java.util.Objects;
 
 public interface XMLNodeVisitor {
-    default NodeVisitResultPre visitNodePre(List<Node> stack) {
+    default NodeVisitResultPre visitNodePre(final List<Node> stack) {
         return NodeVisitResultPre.CONTINUE;
     }
 
-    default NodeVisitResultPost visitNodePost(List<Node> stack) {
+    default NodeVisitResultPost visitNodePost(final List<Node> stack) {
         return NodeVisitResultPost.CONTINUE;
     }
 
@@ -22,23 +22,23 @@ public interface XMLNodeVisitor {
         CONTINUE, END_TRAVERSAL
     }
 
-    static boolean stackMatches(List<Node> nodes, String... names) {
+    static boolean stackMatches(final List<Node> nodes, final String... names) {
         return stackMatches(nodes, false, names);
     }
 
-    static boolean stackSame(List<Node> nodes, String... names) {
+    static boolean stackSame(final List<Node> nodes, final String... names) {
         return stackMatches(nodes, true, names);
     }
 
-    static boolean stackMatches(List<Node> nodes, boolean strict, String... names) {
+    static boolean stackMatches(final List<Node> nodes, final boolean strict, final String... names) {
         if(nodes.size() < names.length) return false;
         int nameIndex = 0;
         int nodeIndex = 0;
         while(nameIndex < names.length) {
             if(nodeIndex >= nodes.size()) return false;
-            Node node = nodes.get(nodeIndex++);
+            final Node node = nodes.get(nodeIndex++);
             if(!strict && node.getNodeType() != Node.ELEMENT_NODE) continue;
-            String name = names[nameIndex++];
+            final String name = names[nameIndex++];
             if(name != null &&
                 node.getNodeType() == Node.ELEMENT_NODE &&
                 !Objects.equals(name, node.getNodeName())) return false;
diff --git a/src/main/java/net/woggioni/jwo/xml/Xml.java b/src/main/java/net/woggioni/jwo/xml/Xml.java
index 3c2abcd..171ed23 100644
--- a/src/main/java/net/woggioni/jwo/xml/Xml.java
+++ b/src/main/java/net/woggioni/jwo/xml/Xml.java
@@ -19,51 +19,51 @@ import java.util.stream.StreamSupport;
 @NoArgsConstructor(access = AccessLevel.PRIVATE)
 public class Xml {
 
-    public static Iterator<Node> iterator(NodeList node) {
+    public static Iterator<Node> iterator(final NodeList node) {
         return new NodeListIterator(node);
     }
 
-    public static Iterator<Element> iterator(Element element, String tagName) {
+    public static Iterator<Element> iterator(final Element element, final String tagName) {
         return new ElementIterator(element, tagName);
     }
 
-    public static Iterator<Element> iterator(Element element) {
+    public static Iterator<Element> iterator(final Element element) {
         return new ElementIterator(element);
     }
 
-    public static Spliterator<Node> spliterator(NodeList node) {
+    public static Spliterator<Node> spliterator(final NodeList node) {
         return Spliterators.spliteratorUnknownSize(iterator(node), 0);
     }
 
-    public static Spliterator<Element> spliterator(Element element) {
+    public static Spliterator<Element> spliterator(final Element element) {
         return Spliterators.spliteratorUnknownSize(iterator(element), 0);
     }
 
-    public static Stream<Node> stream(NodeList node) {
+    public static Stream<Node> stream(final NodeList node) {
         return StreamSupport.stream(spliterator(node), false);
     }
 
-    public static Stream<Element> stream(Element element) {
+    public static Stream<Element> stream(final Element element) {
         return StreamSupport.stream(spliterator(element), false);
     }
-    public static Iterable<Node> iterable(NodeList node) {
+    public static Iterable<Node> iterable(final NodeList node) {
         return () -> iterator(node);
     }
 
-    public static Iterable<Element> iterable(Element element, String tagName) {
+    public static Iterable<Element> iterable(final Element element, final String tagName) {
         return () -> iterator(element, tagName);
     }
 
-    public static Iterable<Element> iterable(Element element) {
+    public static Iterable<Element> iterable(final Element element) {
         return () -> iterator(element);
     }
 
     @SuppressWarnings("unchecked")
-    public static <T> T withChild(Node node, Fun<Node, T> callback, String... path) {
+    public static <T> T withChild(final Node node, final Fun<Node, T> callback, String... path) {
         Object[] result = new Object[1];
         XMLNodeVisitor visitor = new XMLNodeVisitor() {
             @Override
-            public NodeVisitResultPre visitNodePre(List<Node> stack) {
+            public NodeVisitResultPre visitNodePre(final List<Node> stack) {
                 if (XMLNodeVisitor.stackMatches(stack, path)) {
                     result[0] = callback.apply(JWO.tail(stack));
                     return NodeVisitResultPre.END_TRAVERSAL;
@@ -77,14 +77,14 @@ public class Xml {
         return (T) result[0];
     }
 
-    public static void withChild(Element element, String tagName, Con<Element> callback) {
-        for (Element el : iterable(element, tagName)) {
+    public static void withChild(final Element element, final String tagName, final Con<Element> callback) {
+        for (final Element el : iterable(element, tagName)) {
             callback.accept(el);
         }
     }
 
-    public static void withChild(Element element, Con<Element> callback) {
-        for (Element el : iterable(element)) {
+    public static void withChild(final Element element, final Con<Element> callback) {
+        for (final Element el : iterable(element)) {
             callback.accept(el);
         }
     }
diff --git a/src/test/java/net/woggioni/jwo/CircularBufferTest.java b/src/test/java/net/woggioni/jwo/CircularBufferTest.java
index fb00732..e7bede3 100644
--- a/src/test/java/net/woggioni/jwo/CircularBufferTest.java
+++ b/src/test/java/net/woggioni/jwo/CircularBufferTest.java
@@ -15,17 +15,17 @@ public class CircularBufferTest {
     @Test
     @SneakyThrows
     public void test() {
-        MessageDigest streamDigest = MessageDigest.getInstance("MD5"), outputDigest = MessageDigest.getInstance("MD5");
-        InputStream is = new DigestInputStream(getClass().getResourceAsStream("/render_template_test.txt"), streamDigest);
-        CircularBuffer cb = new CircularBuffer(new InputStreamReader(is), 32);
-        Random rand = new Random();
+        final MessageDigest streamDigest = MessageDigest.getInstance("MD5"), outputDigest = MessageDigest.getInstance("MD5");
+        final InputStream is = new DigestInputStream(getClass().getResourceAsStream("/render_template_test.txt"), streamDigest);
+        final CircularBuffer cb = new CircularBuffer(new InputStreamReader(is), 32);
+        final Random rand = new Random();
         while (true) {
-            int b = cb.next();
+            final int b = cb.next();
             if (b < 0) break;
             if (rand.nextInt() % 2 == 0) {
                 cb.prev();
             } else {
-                char c = (char) b;
+                final char c = (char) b;
                 outputDigest.update((byte) b);
             }
         }
diff --git a/src/test/java/net/woggioni/jwo/ExtractorInputStreamTest.java b/src/test/java/net/woggioni/jwo/ExtractorInputStreamTest.java
index d7983df..a39649e 100644
--- a/src/test/java/net/woggioni/jwo/ExtractorInputStreamTest.java
+++ b/src/test/java/net/woggioni/jwo/ExtractorInputStreamTest.java
@@ -35,7 +35,7 @@ public class ExtractorInputStreamTest {
     private Path testExtractionDestination;
 
     @BeforeEach
-    void setup(@TempDir Path testDir) {
+    void setup(final @TempDir Path testDir) {
         testJar = Paths.get(System.getProperty("junit.jupiter.engine.jar"));
         referenceExtractionDestination = testDir.resolve("referenceExtraction");
         testExtractionDestination = testDir.resolve("testExtraction");
@@ -44,14 +44,14 @@ public class ExtractorInputStreamTest {
 
     @SneakyThrows
     private static void referenceUnzipMethod(Path source, Path destination) {
-        try(FileSystem fs = FileSystems.newFileSystem(source, (ClassLoader) null)) {
-            for(Path root : fs.getRootDirectories()) {
+        try(final FileSystem fs = FileSystems.newFileSystem(source, (ClassLoader) null)) {
+            for(final Path root : fs.getRootDirectories()) {
                 Files.walk(root)
                         .filter(it -> !Files.isDirectory(it)).forEach(new Consumer<Path>() {
                     @Override
                     @SneakyThrows
-                    public void accept(Path path) {
-                        Path newDir = destination.resolve(root.relativize(path).toString());
+                    public void accept(final Path path) {
+                        final Path newDir = destination.resolve(root.relativize(path).toString());
                         Files.createDirectories(newDir.getParent());
                         Files.copy(path, newDir);
                     }
@@ -62,22 +62,22 @@ public class ExtractorInputStreamTest {
 
     @SneakyThrows
     private static NavigableMap<String, Hash> hashFileTree(Path tree) {
-        NavigableMap<String, Hash> result = new TreeMap<>();
-        byte[] buffer = new byte[0x1000];
-        FileVisitor<Path> visitor = new SimpleFileVisitor<Path>() {
+        final NavigableMap<String, Hash> result = new TreeMap<>();
+        final byte[] buffer = new byte[0x1000];
+        final FileVisitor<Path> visitor = new SimpleFileVisitor<Path>() {
             @Override
-            public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
-                String key = tree.relativize(file).toString();
+            public FileVisitResult visitFile(final Path file, final BasicFileAttributes attrs) throws IOException {
+                final String key = tree.relativize(file).toString();
                 if(!Objects.equals(JarFile.MANIFEST_NAME, key)) {
                     try (InputStream is = Files.newInputStream(file)) {
                         result.put(key, Hash.md5(is, buffer));
                     }
                 } else {
-                    Manifest manifest = new Manifest();
-                    try (InputStream is = Files.newInputStream(file)) {
+                    final Manifest manifest = new Manifest();
+                    try (final InputStream is = Files.newInputStream(file)) {
                         manifest.read(is);
                     }
-                    ByteArrayOutputStream baos = new ByteArrayOutputStream();
+                    final ByteArrayOutputStream baos = new ByteArrayOutputStream();
                     try {
                         manifest.write(baos);
                     } finally {
@@ -92,18 +92,18 @@ public class ExtractorInputStreamTest {
         return result;
     }
 
-    private static boolean compareFileTree(Path tree1, Path tree2) {
-        NavigableMap<String, Hash> hash1 = hashFileTree(tree1);
-        NavigableMap<String, Hash> hash2 = hashFileTree(tree2);
+    private static boolean compareFileTree(final Path tree1, final Path tree2) {
+        final NavigableMap<String, Hash> hash1 = hashFileTree(tree1);
+        final NavigableMap<String, Hash> hash2 = hashFileTree(tree2);
         return Objects.equals(hash1, hash2);
     }
 
     @SneakyThrows
-    public void run(Supplier<ZipInputStream> zipInputStreamSupplier) {
+    public void run(final Supplier<ZipInputStream> zipInputStreamSupplier) {
         referenceUnzipMethod(testJar, referenceExtractionDestination);
-        try(ZipInputStream zipInputStream = zipInputStreamSupplier.get()) {
+        try(final ZipInputStream zipInputStream = zipInputStreamSupplier.get()) {
             while(true) {
-                ZipEntry zipEntry = zipInputStream.getNextEntry();
+                final ZipEntry zipEntry = zipInputStream.getNextEntry();
                 if(zipEntry == null) break;
                 JWO.write2Stream(new NullOutputStream(), zipInputStream);
                 zipInputStream.closeEntry();
@@ -115,7 +115,7 @@ public class ExtractorInputStreamTest {
     @Test
     @SneakyThrows
     public void zipExtractorInputStreamTest() {
-        Supplier<ZipInputStream> supplier = new Supplier<ZipInputStream>() {
+        final Supplier<ZipInputStream> supplier = new Supplier<ZipInputStream>() {
             @Override
             @SneakyThrows
             public ZipInputStream get() {
@@ -128,7 +128,7 @@ public class ExtractorInputStreamTest {
     @Test
     @SneakyThrows
     public void jarExtractorInputStreamTest() {
-        Supplier<ZipInputStream> supplier = new Supplier<ZipInputStream>() {
+        final Supplier<ZipInputStream> supplier = new Supplier<ZipInputStream>() {
             @Override
             @SneakyThrows
             public ZipInputStream get() {
diff --git a/src/test/java/net/woggioni/jwo/HashTest.java b/src/test/java/net/woggioni/jwo/HashTest.java
index 239856c..10a26d9 100644
--- a/src/test/java/net/woggioni/jwo/HashTest.java
+++ b/src/test/java/net/woggioni/jwo/HashTest.java
@@ -20,15 +20,15 @@ public class HashTest {
     @BeforeEach
     public void setup() {
         sample = new byte[0x400];
-        Random random = new Random(0xdeadbeef);
+        final Random random = new Random(0xdeadbeef);
         random.nextBytes(sample);
     }
 
     @Test
     public void checkHashIsRepeatableAndComparesCorrectly() {
-        byte[] buffer = new byte[0x1000];
-        Hash hash1 = Hash.md5(new ByteArrayInputStream(sample), buffer);
-        Hash hash2 = Hash.md5(new ByteArrayInputStream(sample), buffer);
+        final byte[] buffer = new byte[0x1000];
+        final Hash hash1 = Hash.md5(new ByteArrayInputStream(sample), buffer);
+        final Hash hash2 = Hash.md5(new ByteArrayInputStream(sample), buffer);
         Assertions.assertEquals(hash1.hashCode(), hash2.hashCode());
         Assertions.assertEquals(hash1, hash2);
         Assertions.assertEquals(hash1.toString(), hash2.toString());
@@ -36,14 +36,14 @@ public class HashTest {
 
     @Test
     public void checkReversingTheSampleGivesDifferentHash() {
-        byte[] reverseSample = new byte[sample.length];
+        final byte[] reverseSample = new byte[sample.length];
         for(int i = 0; i < sample.length; i++) {
             reverseSample[reverseSample.length - i - 1] = sample[i];
         }
 
-        byte[] buffer = new byte[0x1000];
-        Hash hash1 = Hash.md5(new ByteArrayInputStream(sample), buffer);
-        Hash hash2 = Hash.md5(new ByteArrayInputStream(reverseSample), buffer);
+        final byte[] buffer = new byte[0x1000];
+        final Hash hash1 = Hash.md5(new ByteArrayInputStream(sample), buffer);
+        final Hash hash2 = Hash.md5(new ByteArrayInputStream(reverseSample), buffer);
         Assertions.assertNotEquals(hash1.hashCode(), hash2.hashCode());
         Assertions.assertNotEquals(hash1, hash2);
         Assertions.assertNotEquals(hash1.toString(), hash2.toString());
@@ -53,7 +53,7 @@ public class HashTest {
     private static class HexTestArguments implements ArgumentsProvider {
         @Override
         public Stream<? extends Arguments> provideArguments(
-            ExtensionContext extensionContext
+                final ExtensionContext extensionContext
         ) {
             return Stream.of(
                 Arguments.of("A41D767EEF6084823F250E954BDD48CF", null),
@@ -68,13 +68,13 @@ public class HashTest {
 
     @ArgumentsSource(HexTestArguments.class)
     @ParameterizedTest
-    public void hexTest(String sourceString, Class<? extends Throwable> t) {
+    public void hexTest(final String sourceString, final Class<? extends Throwable> t) {
         if(t != null) {
             Assertions.assertThrows(t, () ->
                 Hash.hexToBytes(sourceString)
             );
         } else {
-            byte[] bytes = Hash.hexToBytes(sourceString);
+            final byte[] bytes = Hash.hexToBytes(sourceString);
             Assertions.assertEquals(sourceString.length() / 2, bytes.length);
             Assertions.assertEquals(sourceString.toUpperCase(), Hash.bytesToHex(bytes));
         }
@@ -82,13 +82,13 @@ public class HashTest {
 
     @ArgumentsSource(HexTestArguments.class)
     @ParameterizedTest
-    public void hexTest2(String sourceString, Class<? extends Throwable> t) {
+    public void hexTest2(final String sourceString, final Class<? extends Throwable> t) {
         if(t != null) {
             Assertions.assertThrows(t, () ->
                     Hash.hexToBytes2(sourceString)
             );
         } else {
-            byte[] bytes = Hash.hexToBytes2(sourceString);
+            final byte[] bytes = Hash.hexToBytes2(sourceString);
             Assertions.assertEquals(sourceString.length() / 2, bytes.length);
             Assertions.assertEquals(sourceString.toUpperCase(), Hash.bytesToHex(bytes));
         }
diff --git a/src/test/java/net/woggioni/jwo/JWOTest.java b/src/test/java/net/woggioni/jwo/JWOTest.java
index ee08597..b3b2ff1 100644
--- a/src/test/java/net/woggioni/jwo/JWOTest.java
+++ b/src/test/java/net/woggioni/jwo/JWOTest.java
@@ -67,8 +67,8 @@ public class JWOTest {
 
     @Test
     public void flatMapTest() {
-        Stream<Integer> s = Stream.of(3, 4);
-        List<Integer> l = JWO.flatMap(s, (n) -> {
+        final Stream<Integer> s = Stream.of(3, 4);
+        final List<Integer> l = JWO.flatMap(s, (n) -> {
             if (n > 3) return Optional.of(n);
             else return Optional.empty();
         }).collect(Collectors.toList());
@@ -77,7 +77,7 @@ public class JWOTest {
 
     @Test
     public void optional2StreamTest() {
-        Integer integer = 3;
+        final Integer integer = 3;
         Optional<Integer> s = Optional.of(integer);
         JWO.optional2Stream(s).forEach(n -> assertEquals(integer, n));
         s = Optional.empty();
@@ -88,10 +88,10 @@ public class JWOTest {
 
     @Test
     public void optional2StreamTest2() {
-        Integer integer = 3;
-        Optional<Integer> o1 = Optional.of(integer);
-        Integer integer2 = 3;
-        Optional<Integer> o2 = Optional.of(integer2);
+        final Integer integer = 3;
+        final Optional<Integer> o1 = Optional.of(integer);
+        final Integer integer2 = 3;
+        final Optional<Integer> o2 = Optional.of(integer2);
         final var values = JWO.optional2Stream(o1, Optional.empty(), o2)
             .collect(Collectors.toList());
         assertEquals(Arrays.asList(integer, integer2), values);
@@ -99,9 +99,9 @@ public class JWOTest {
 
     @Test
     public void optionalOrTest() {
-        Integer integer = 3;
-        Optional<Integer> o1 = Optional.of(integer);
-        Optional<Integer> o2 = Optional.of(integer);
+        final Integer integer = 3;
+        final Optional<Integer> o1 = Optional.of(integer);
+        final Optional<Integer> o2 = Optional.of(integer);
         assertEquals(o2, JWO.or(Optional.empty(), o2));
         assertEquals(o1, JWO.or(o1, Optional.empty()));
         assertEquals(Optional.empty(), JWO.or(Optional.empty(), Optional.empty()));
@@ -133,9 +133,9 @@ public class JWOTest {
 
     @ParameterizedTest
     @EnumSource(IndexOfWithEscapeTestCase.class)
-    public void testIndexOfWithEscape(IndexOfWithEscapeTestCase testCase) {
-        String haystack = testCase.haystack;
-        List<Integer> solution = newArrayList();
+    public void testIndexOfWithEscape(final IndexOfWithEscapeTestCase testCase) {
+        final String haystack = testCase.haystack;
+        final List<Integer> solution = newArrayList();
         int i = 0;
         while (true) {
             i = JWO.indexOfWithEscape(haystack, testCase.needle, testCase.escape, i, haystack.length());
@@ -149,18 +149,18 @@ public class JWOTest {
     @Test
     @SneakyThrows
     public void testRenderTemplate() {
-        Map<String, Object> valuesMap = new HashMap<>();
+        final Map<String, Object> valuesMap = new HashMap<>();
         valuesMap.put("author", "John Doe");
         valuesMap.put("date", "2020-03-25 16:22");
         valuesMap.put("adjective", "simple");
-        String expected = """
+        final String expected = """
             This is a simple test made by John Doe on 2020-03-25 16:22. It's really simple!
             /home/user
             /home/user
             defaultValue
             ;=%x$!~L+LJr?50l.^{veaS'zLHo=!}wT
             """;
-        Map<String, Map<String, Object>> contextMap = new MapBuilder<String, Map<String, Object>>()
+        final Map<String, Map<String, Object>> contextMap = new MapBuilder<String, Map<String, Object>>()
             .entry("env",
                 new MapBuilder<String, String>()
                     .entry("HOME", "/home/user")
@@ -171,39 +171,39 @@ public class JWOTest {
                     .entry("user.home", "/home/user")
                     .build(TreeMap::new, Collections::unmodifiableMap)
             ).build(TreeMap::new, Collections::unmodifiableMap);
-        try (Reader reader = new InputStreamReader(
+        try (final Reader reader = new InputStreamReader(
             JWOTest.class.getResourceAsStream("/render_template_test.txt"))) {
-            String rendered = JWO.renderTemplate(reader, valuesMap, contextMap);
+            final String rendered = JWO.renderTemplate(reader, valuesMap, contextMap);
             assertEquals(expected, rendered);
         }
-        try (Reader reader = new InputStreamReader(
+        try (final Reader reader = new InputStreamReader(
             JWOTest.class.getResourceAsStream("/render_template_test.txt"))) {
-            String rendered = JWO.renderTemplate(JWO.readAll(reader), valuesMap, contextMap);
+            final String rendered = JWO.renderTemplate(JWO.readAll(reader), valuesMap, contextMap);
             assertEquals(expected, rendered);
         }
     }
 
 
-    public static String renderTemplateNaive(String template, Map<String, Object> valuesMap) {
-        StringBuilder formatter = new StringBuilder(template);
-        Object absent = new Object();
+    public static String renderTemplateNaive(final String template, final Map<String, Object> valuesMap) {
+        final StringBuilder formatter = new StringBuilder(template);
+        final Object absent = new Object();
 
-        Matcher matcher = Pattern.compile("\\$\\{(\\w+)}").matcher(template);
+        final Matcher matcher = Pattern.compile("\\$\\{(\\w+)}").matcher(template);
 
         while (matcher.find()) {
-            String key = matcher.group(1);
+            final String key = matcher.group(1);
 
-            String formatKey = String.format("${%s}", key);
-            int index = formatter.indexOf(formatKey);
+            final String formatKey = String.format("${%s}", key);
+            final int index = formatter.indexOf(formatKey);
 
             // If the key is present:
             //  - If the value is not null, then replace the variable for the value
             //  - If the value is null, replace the variable for empty string
             // If the key is not present, leave the variable untouched.
             if (index != -1) {
-                Object value = valuesMap.getOrDefault(key, absent);
+                final Object value = valuesMap.getOrDefault(key, absent);
                 if (value != absent) {
-                    String valueStr = value != null ? value.toString() : "";
+                    final String valueStr = value != null ? value.toString() : "";
                     formatter.replace(index, index + formatKey.length(), valueStr);
                 }
             }
@@ -214,14 +214,14 @@ public class JWOTest {
     @Test
     @SneakyThrows
     @EnabledOnOs(OS.LINUX)
-    public void uidTest(@TempDir Path testDir) {
-        PosixFileAttributes pfa = Files.readAttributes(testDir, PosixFileAttributes.class);
-        UserPrincipal expectedUser = pfa.owner();
-        Class<? extends UserPrincipal> userClass = expectedUser.getClass();
-        Method m = userClass.getDeclaredMethod("uid");
+    public void uidTest(final @TempDir Path testDir) {
+        final PosixFileAttributes pfa = Files.readAttributes(testDir, PosixFileAttributes.class);
+        final UserPrincipal expectedUser = pfa.owner();
+        final Class<? extends UserPrincipal> userClass = expectedUser.getClass();
+        final Method m = userClass.getDeclaredMethod("uid");
         m.setAccessible(true);
-        int expectedUserId = (Integer) m.invoke(expectedUser);
-        int uid = (int) JWO.uid();
+        final int expectedUserId = (Integer) m.invoke(expectedUser);
+        final int uid = (int) JWO.uid();
         assertEquals(expectedUserId, uid);
     }
 
@@ -230,9 +230,9 @@ public class JWOTest {
 
         private interface CommonInterface {
             void replaceFileIfDifferent(
-                Supplier<InputStream> inputStreamSupplier,
-                Path destination,
-                FileAttribute<?>... attrs
+                    final Supplier<InputStream> inputStreamSupplier,
+                    final Path destination,
+                    final FileAttribute<?>... attrs
             );
         }
 
@@ -249,9 +249,9 @@ public class JWOTest {
             private final CommonInterface xface;
 
             public void replaceFileIfDifferent(
-                Supplier<InputStream> inputStreamSupplier,
-                Path destination,
-                FileAttribute<?>... attrs
+                    final Supplier<InputStream> inputStreamSupplier,
+                    final Path destination,
+                    final FileAttribute<?>... attrs
             ) {
                 xface.replaceFileIfDifferent(inputStreamSupplier, destination, attrs);
             }
@@ -267,10 +267,10 @@ public class JWOTest {
         @SneakyThrows
         @ParameterizedTest
         @EnumSource(MethodToTest.class)
-        public void ensureFileCopy(MethodToTest methodToTest) {
+        public void ensureFileCopy(final MethodToTest methodToTest) {
             final var dest = testDir.resolve("cracklib-small");
             methodToTest.replaceFileIfDifferent(source, dest);
-            Hash newFileHash, newContentHash;
+            final Hash newFileHash, newContentHash;
             try (final var inputStream = source.get()) {
                 newContentHash = Hash.md5(inputStream);
             }
@@ -283,7 +283,7 @@ public class JWOTest {
         @SneakyThrows
         @ParameterizedTest
         @EnumSource(MethodToTest.class)
-        public void ensureNoWriteWithNoChange(MethodToTest methodToTest) {
+        public void ensureNoWriteWithNoChange(final MethodToTest methodToTest) {
             final var dest = testDir.resolve("cracklib-small");
             try (final var inputStream = source.get()) {
                 Files.copy(inputStream, dest);
@@ -297,7 +297,7 @@ public class JWOTest {
         @SneakyThrows
         @ParameterizedTest
         @EnumSource(MethodToTest.class)
-        public void ensureWriteWithContentChange(MethodToTest methodToTest) {
+        public void ensureWriteWithContentChange(final MethodToTest methodToTest) {
             final var dest = testDir.resolve("cracklib-small");
             try (final var inputStream = source.get()) {
                 Files.copy(inputStream, dest);
@@ -338,7 +338,7 @@ public class JWOTest {
 
         @ParameterizedTest
         @MethodSource("testCases")
-        public void capitalizeTest(TestCase<String, String> testCase) {
+        public void capitalizeTest(final TestCase<String, String> testCase) {
             if (testCase.error() == null) {
                 assertEquals(testCase.expectedOutput(), JWO.capitalize(testCase.input()));
             } else {
@@ -370,7 +370,7 @@ public class JWOTest {
 
         @ParameterizedTest
         @MethodSource("testCases")
-        public void decapitalizeTest(TestCase<String, String> testCase) {
+        public void decapitalizeTest(final TestCase<String, String> testCase) {
             if (testCase.error() == null) {
                 assertEquals(testCase.expectedOutput(), JWO.decapitalize(testCase.input()));
             } else {
@@ -418,10 +418,10 @@ public class JWOTest {
 
         @MethodSource
         @ParameterizedTest
-        public void test(TestCase<Integer[], Void> testCase) {
+        public void test(final TestCase<Integer[], Void> testCase) {
             final var it = JWO.iterator(testCase.input());
 
-            for (Integer n : testCase.input()) {
+            for (final Integer n : testCase.input()) {
                 final var m = it.next();
                 assertEquals(n, m);
             }
@@ -432,7 +432,7 @@ public class JWOTest {
     @Test
     @SneakyThrows
     public void copyTest() {
-        MessageDigest md1 = Hash.Algorithm.MD5.newMessageDigest();
+        final MessageDigest md1 = Hash.Algorithm.MD5.newMessageDigest();
         final Supplier<Reader> source = JWO.compose(
             JWO.compose(
                 () -> getClass().getResourceAsStream(CRACKLIB_RESOURCE),
@@ -440,7 +440,7 @@ public class JWOTest {
             ),
             (InputStream is) -> new InputStreamReader(is)
         );
-        MessageDigest md2 = Hash.Algorithm.MD5.newMessageDigest();
+        final MessageDigest md2 = Hash.Algorithm.MD5.newMessageDigest();
         final Supplier<Writer> destination = JWO.compose(
             JWO.compose(
                 NullOutputStream::new,
@@ -450,7 +450,7 @@ public class JWOTest {
         );
 
         try (final var reader = source.get()) {
-            try (Writer writer = destination.get()) {
+            try (final Writer writer = destination.get()) {
                 JWO.copy(reader, writer);
             }
         }
@@ -497,12 +497,12 @@ public class JWOTest {
         JWO.extractZip(reassembledBundle, destination3);
         final var visitor = new FileVisitor<Path>() {
             @Override
-            public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) {
+            public FileVisitResult preVisitDirectory(final Path dir, final BasicFileAttributes attrs) {
                 return FileVisitResult.CONTINUE;
             }
 
             @Override
-            public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) {
+            public FileVisitResult visitFile(final Path file, final BasicFileAttributes attrs) {
                 final var relativePath = destination1.relativize(file);
                 final var hashes = Stream.of(
                     destination1.resolve(relativePath),
@@ -520,12 +520,12 @@ public class JWOTest {
             }
 
             @Override
-            public FileVisitResult visitFileFailed(Path file, IOException exc) {
+            public FileVisitResult visitFileFailed(final Path file, final IOException exc) {
                 return FileVisitResult.CONTINUE;
             }
 
             @Override
-            public FileVisitResult postVisitDirectory(Path dir, IOException exc) {
+            public FileVisitResult postVisitDirectory(final Path dir, final IOException exc) {
                 return FileVisitResult.CONTINUE;
             }
         };
@@ -560,11 +560,11 @@ public class JWOTest {
                 super();
             }
 
-            public SomeWeirdException(String msg) {
+            public SomeWeirdException(final String msg) {
                 super(msg);
             }
 
-            public SomeWeirdException(String msg, Throwable cause) {
+            public SomeWeirdException(final String msg, final Throwable cause) {
                 super(msg, cause);
             }
         }
@@ -634,7 +634,7 @@ public class JWOTest {
                     "some message with placeholder %d",
                     25
                 );
-            } catch (Throwable t) {
+            } catch (final Throwable t) {
                 assertTrue(t.getCause() == cause);
                 throw t;
             }
@@ -653,7 +653,7 @@ public class JWOTest {
 
     @Test
     @SneakyThrows
-    public void readFile(@TempDir Path testDir) {
+    public void readFile(final @TempDir Path testDir) {
         final var destination = testDir.resolve("cracklib-small");
         final var dis = Hash.Algorithm.MD5.newInputStream(getClass().getResourceAsStream(CRACKLIB_RESOURCE));
         final var md = dis.getMessageDigest();
diff --git a/src/test/java/net/woggioni/jwo/JavaVersionTest.java b/src/test/java/net/woggioni/jwo/JavaVersionTest.java
index d3d3a91..c501345 100644
--- a/src/test/java/net/woggioni/jwo/JavaVersionTest.java
+++ b/src/test/java/net/woggioni/jwo/JavaVersionTest.java
@@ -64,7 +64,7 @@ public class JavaVersionTest {
 
     @MethodSource
     @ParameterizedTest
-    public void comparatorTest(TestCase<Tuple2<JavaVersion, JavaVersion>, Integer> testCase) {
+    public void comparatorTest(final TestCase<Tuple2<JavaVersion, JavaVersion>, Integer> testCase) {
         final var comparator = Comparator.<JavaVersion>naturalOrder();
         final var pair = testCase.input();
         final var comparisonResult = Optional.of(comparator.compare(pair.get_1(), pair.get_2()))
diff --git a/src/test/java/net/woggioni/jwo/Leb128Test.java b/src/test/java/net/woggioni/jwo/Leb128Test.java
index f9423de..f7fa314 100644
--- a/src/test/java/net/woggioni/jwo/Leb128Test.java
+++ b/src/test/java/net/woggioni/jwo/Leb128Test.java
@@ -13,48 +13,48 @@ public class Leb128Test {
 
     @Test
     public void testLong() {
-        ByteArrayOutputStream baos = new ByteArrayOutputStream();
-        List<Long> numbers = Arrays.asList(0L, 1L, -3L, 5L, 7L, 8L, 125L, 255L, 10325L, -2000L, 1024L * 1024L * 1024L * 12L);
+        final ByteArrayOutputStream baos = new ByteArrayOutputStream();
+        final List<Long> numbers = Arrays.asList(0L, 1L, -3L, 5L, 7L, 8L, 125L, 255L, 10325L, -2000L, 1024L * 1024L * 1024L * 12L);
 
         numbers.forEach(n -> Leb128.encode(baos, n));
 
-        byte[] bytes = baos.toByteArray();
+        final byte[] bytes = baos.toByteArray();
 
-        Leb128.Leb128Decoder decoder = new Leb128.Leb128Decoder(new ByteArrayInputStream(bytes));
+        final Leb128.Leb128Decoder decoder = new Leb128.Leb128Decoder(new ByteArrayInputStream(bytes));
         numbers.forEach(n -> Assertions.assertEquals((long) n, decoder.decode()));
     }
 
     @Test
     public void testDouble() {
-        ByteArrayOutputStream baos = new ByteArrayOutputStream();
-        List<Double> numbers = Arrays.asList(
+        final ByteArrayOutputStream baos = new ByteArrayOutputStream();
+        final List<Double> numbers = Arrays.asList(
                 0.0, 1.5, -3.0, 0.5, 2.5, 8.25, -125.0, 255.0, 10325.0, -2000.0, 1024.0 * 1024 * 1024 * 12,
                 -122.42200352825247, 37.80848009696725);
 
         numbers.forEach(n -> Leb128.encode(baos, n));
 
-        byte[] bytes = baos.toByteArray();
+        final byte[] bytes = baos.toByteArray();
 
-        Leb128.Leb128Decoder decoder = new Leb128.Leb128Decoder(new ByteArrayInputStream(bytes));
+        final Leb128.Leb128Decoder decoder = new Leb128.Leb128Decoder(new ByteArrayInputStream(bytes));
         numbers.forEach(n -> Assertions.assertEquals(n, decoder.decodeDouble(), 0.0));
     }
 
 
     @Test
     public void reverseTest() {
-        long n = 101325;
+        final long n = 101325;
         Assertions.assertEquals(n, Leb128.reverse(Leb128.reverse(n)));
     }
 
     @Test
     @SneakyThrows
     public void reverseTestDouble() {
-        double n = 0.25;
-        long doubleLong = Double.doubleToLongBits(n);
-        long reverse = Leb128.reverse(doubleLong);
-        try(ByteArrayOutputStream os = new ByteArrayOutputStream()) {
+        final double n = 0.25;
+        final long doubleLong = Double.doubleToLongBits(n);
+        final long reverse = Leb128.reverse(doubleLong);
+        try(final ByteArrayOutputStream os = new ByteArrayOutputStream()) {
             Leb128.encode(os, reverse);
-            byte[] bytes = os.toByteArray();
+            final byte[] bytes = os.toByteArray();
             Assertions.assertEquals(3, bytes.length);
         }
     }
diff --git a/src/test/java/net/woggioni/jwo/LexicographicIterableComparatorTest.java b/src/test/java/net/woggioni/jwo/LexicographicIterableComparatorTest.java
index 16bfd1b..d8c13fa 100644
--- a/src/test/java/net/woggioni/jwo/LexicographicIterableComparatorTest.java
+++ b/src/test/java/net/woggioni/jwo/LexicographicIterableComparatorTest.java
@@ -13,7 +13,7 @@ import static org.junit.jupiter.api.Assertions.assertEquals;
 public class LexicographicIterableComparatorTest {
 
     private final static Comparator<Integer> DESCENDING_INTEGER_COMPARATOR = new Comparator<Integer>() {
-        public int compare(Integer o1, Integer o2) {
+        public int compare(final Integer o1, final Integer o2) {
             return -o1.compareTo(o2);
         }
     };
diff --git a/src/test/java/net/woggioni/jwo/LruCacheTest.java b/src/test/java/net/woggioni/jwo/LruCacheTest.java
index d69dbd6..cf1de77 100644
--- a/src/test/java/net/woggioni/jwo/LruCacheTest.java
+++ b/src/test/java/net/woggioni/jwo/LruCacheTest.java
@@ -30,10 +30,10 @@ class RandomObject implements Serializable {
     String md5half2 = md5.substring(16);
 
     @SneakyThrows
-    private String md5(String source) {
-        MessageDigest md = MessageDigest.getInstance("MD5");
+    private String md5(final String source) {
+        final MessageDigest md = MessageDigest.getInstance("MD5");
         md.update(source.getBytes());
-        byte[] digest = md.digest();
+        final byte[] digest = md.digest();
         return JWO.bytesToHex(digest);
     }
 }
@@ -94,7 +94,7 @@ public class LruCacheTest {
 
     @Test
     public void cacheWithFallback() {
-        Map<String, RandomObject> fallback = new HashMap<>();
+        final Map<String, RandomObject> fallback = new HashMap<>();
         lruCache = new LruCache<>(CACHE_MAX_SIZE, true, null, fallback);
         objects = new ArrayList<>();
         for (int i = 0; i < NUMBER_OF_ENTRIES; i++) {
@@ -110,7 +110,7 @@ public class LruCacheTest {
         Assertions.assertEquals(NUMBER_OF_ENTRIES, lruCache.size());
 
         //Removing the first inserted element should return it and decrease the cache size by 1
-        RandomObject randomObject = objects.get(0);
+        final RandomObject randomObject = objects.get(0);
         Assertions.assertEquals(randomObject, lruCache.remove(randomObject.name));
         Assertions.assertFalse(lruCache.containsKey(randomObject.name));
         Assertions.assertEquals(NUMBER_OF_ENTRIES - 1, lruCache.size());
@@ -122,12 +122,12 @@ public class LruCacheTest {
 
     @Test
     public void cacheWithLoader() {
-        Function<String, RandomObject> loader = key -> {
+        final Function<String, RandomObject> loader = key -> {
             loaderInvocations++;
             return objects.stream().filter(o -> Objects.equals(key, o.name)).findFirst().get();
         };
         lruCache = new LruCache<>(CACHE_MAX_SIZE, true, loader);
-        LruCache<String, RandomObject>.Stats stats = lruCache.getStats();
+        final LruCache<String, RandomObject>.Stats stats = lruCache.getStats();
         objects = new ArrayList<>();
         for (int i = 0; i < NUMBER_OF_ENTRIES; i++) {
             RandomObject randomObject = new RandomObject();
@@ -150,7 +150,7 @@ public class LruCacheTest {
         Assertions.assertEquals(loaderInvocations, this.loaderInvocations);
 
         // The cache should not contain any of the first NUMBER_OF_ENTRIES - CACHE_MAX_SIZE elements
-        int evictedElements = NUMBER_OF_ENTRIES - CACHE_MAX_SIZE;
+        final int evictedElements = NUMBER_OF_ENTRIES - CACHE_MAX_SIZE;
         objects.stream().limit(evictedElements)
             .forEach(value -> Assertions.assertFalse(lruCache.containsKey(value.name)));
 
diff --git a/src/test/java/net/woggioni/jwo/PathClassLoaderTest.java b/src/test/java/net/woggioni/jwo/PathClassLoaderTest.java
index e3d4407..62db7e3 100644
--- a/src/test/java/net/woggioni/jwo/PathClassLoaderTest.java
+++ b/src/test/java/net/woggioni/jwo/PathClassLoaderTest.java
@@ -25,7 +25,7 @@ public class PathClassLoaderTest {
             List<Path> paths = StreamSupport.stream(fs.getRootDirectories().spliterator(), false).flatMap(new Function<Path, Stream<Path>>() {
                 @Override
                 @SneakyThrows
-                public Stream<Path> apply(Path path) {
+                public Stream<Path> apply(final Path path) {
                     return Files.list(path)
                             .filter(Files::isRegularFile)
                             .filter(p -> p.getFileName().toString().endsWith(".jar"));
@@ -33,13 +33,13 @@ public class PathClassLoaderTest {
             }).flatMap(new Function<Path, Stream<Path>>() {
                 @Override
                 @SneakyThrows
-                public Stream<Path> apply(Path path) {
+                public Stream<Path> apply(final Path path) {
                     System.out.println(path.getFileName().toString());
                     return StreamSupport.stream(FileSystems.newFileSystem(path, (ClassLoader) null).getRootDirectories().spliterator(), false);
                 }
             }).collect(Collectors.toUnmodifiableList());
-            PathClassLoader classLoader = new PathClassLoader(paths);
-            Class<?>[] cls = new Class[1];
+            final PathClassLoader classLoader = new PathClassLoader(paths);
+            final Class<?>[] cls = new Class[1];
             Assertions.assertDoesNotThrow(() -> {
                 cls[0] = classLoader.loadClass("com.google.common.collect.ImmutableMap");
             });
diff --git a/src/test/java/net/woggioni/jwo/TreeWalkerTest.java b/src/test/java/net/woggioni/jwo/TreeWalkerTest.java
index 4f33471..821d858 100644
--- a/src/test/java/net/woggioni/jwo/TreeWalkerTest.java
+++ b/src/test/java/net/woggioni/jwo/TreeWalkerTest.java
@@ -43,7 +43,7 @@ public class TreeWalkerTest {
             .map(entry -> newNode(entry.getKey(), entry.getValue()))
             .collect(Collectors.toMap(Node::getId, Function.identity()));
 
-    private Node newNode(int id, List<Integer> children) {
+    private Node newNode(final int id, final List<Integer> children) {
         if(children == null) {
             return new Node(id, Collections.emptyList());
         } else {
@@ -63,7 +63,7 @@ public class TreeWalkerTest {
         Iterator<Integer> it_post = expected_post_sequence.iterator();
         TreeNodeVisitor<Node, Void> nodeVisitor = new TreeNodeVisitor<Node, Void>() {
             @Override
-            public VisitOutcome visitPre(List<StackContext<Node, Void>> stackContextList) {
+            public VisitOutcome visitPre(final List<StackContext<Node, Void>> stackContextList) {
                 Assertions.assertTrue(it_pre.hasNext());
                 Assertions.assertEquals(it_pre.next(),
                         stackContextList.get(stackContextList.size() - 1).getNode().getId());
@@ -71,13 +71,13 @@ public class TreeWalkerTest {
             }
 
             @Override
-            public void visitPost(List<StackContext<Node, Void>> stackContextList) {
+            public void visitPost(final List<StackContext<Node, Void>> stackContextList) {
                 Assertions.assertTrue(it_post.hasNext());
                 Assertions.assertEquals(it_post.next(),
                         stackContextList.get(stackContextList.size() - 1).getNode().getId());
             }
         };
-        TreeWalker<Node, Void> walker =
+        final TreeWalker<Node, Void> walker =
                 new TreeWalker<>(nodeVisitor);
         walker.walk(testNodeMap.get(1));
         Assertions.assertFalse(it_pre.hasNext());
@@ -86,14 +86,14 @@ public class TreeWalkerTest {
 
     @Test
     public void filterTest() {
-        List<Integer> expected_pre_sequence = Stream.of(1, 2, 3, 4, 5, 8)
+        final List<Integer> expected_pre_sequence = Stream.of(1, 2, 3, 4, 5, 8)
                 .collect(Collectors.toList());
-        Iterator<Integer> it = expected_pre_sequence.iterator();
-        TreeNodeVisitor<Node, Void> linkVisitor = new TreeNodeVisitor<Node, Void>() {
+        final Iterator<Integer> it = expected_pre_sequence.iterator();
+        final TreeNodeVisitor<Node, Void> linkVisitor = new TreeNodeVisitor<Node, Void>() {
             @Override
-            public VisitOutcome visitPre(List<StackContext<Node, Void>> nodePath) {
+            public VisitOutcome visitPre(final List<StackContext<Node, Void>> nodePath) {
                 Assertions.assertTrue(it.hasNext());
-                Integer id = nodePath.get(nodePath.size() - 1).getNode().getId();
+                final Integer id = nodePath.get(nodePath.size() - 1).getNode().getId();
                 Assertions.assertEquals(it.next(), id);
                 if(Objects.equals(4, nodePath.get(nodePath.size() - 1).getNode().getId())) {
                     return VisitOutcome.SKIP;
@@ -102,7 +102,7 @@ public class TreeWalkerTest {
                 }
             }
         };
-        TreeWalker<Node, Void> walker =
+        final TreeWalker<Node, Void> walker =
                 new TreeWalker<>(linkVisitor);
         walker.walk(testNodeMap.get(1));
         Assertions.assertFalse(it.hasNext());
diff --git a/src/test/java/net/woggioni/jwo/VersionComparatorTest.java b/src/test/java/net/woggioni/jwo/VersionComparatorTest.java
index f26f01f..951bf8b 100644
--- a/src/test/java/net/woggioni/jwo/VersionComparatorTest.java
+++ b/src/test/java/net/woggioni/jwo/VersionComparatorTest.java
@@ -15,7 +15,7 @@ public class VersionComparatorTest {
     private static class TestCaseProvider implements ArgumentsProvider {
         @Override
         @SneakyThrows
-        public Stream<? extends Arguments> provideArguments(ExtensionContext context) {
+        public Stream<? extends Arguments> provideArguments(final ExtensionContext context) {
             return Stream.of(
                     Arguments.of("", "", 0),
                     Arguments.of("asdfg-2019", "asdfg-2019", 0),
@@ -34,7 +34,7 @@ public class VersionComparatorTest {
 
     @ParameterizedTest(name="version1: \"{0}\", version2: \"{1}\", expected outcome: {2}")
     @ArgumentsSource(TestCaseProvider.class)
-    public void test(String version1, String version2, int expectedOutcome) {
+    public void test(final String version1, final String version2, final int expectedOutcome) {
         Assertions.assertEquals(expectedOutcome, VersionComparator.cmp(version1, version2));
     }
 }
diff --git a/src/test/java/net/woggioni/jwo/compression/CompressionOutputStreamTest.java b/src/test/java/net/woggioni/jwo/compression/CompressionOutputStreamTest.java
index 88f15c9..ca9a6e8 100644
--- a/src/test/java/net/woggioni/jwo/compression/CompressionOutputStreamTest.java
+++ b/src/test/java/net/woggioni/jwo/compression/CompressionOutputStreamTest.java
@@ -29,27 +29,27 @@ public class CompressionOutputStreamTest {
     @SneakyThrows
     @ParameterizedTest
     @MethodSource("testParameters")
-    public void test(CompressionFormat compressionFormat, int level) {
-        MessageDigest inputDigest = MessageDigest.getInstance("MD5");
+    public void test(final CompressionFormat compressionFormat, final int level) {
+        final MessageDigest inputDigest = MessageDigest.getInstance("MD5");
         byte[] compressed;
-        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
-        try(InputStream is = new BufferedInputStream(new DigestInputStream(
+        final ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
+        try(final InputStream is = new BufferedInputStream(new DigestInputStream(
                 getClass().getResourceAsStream("/cracklib-small"), inputDigest));
-            CompressionOutputStream compressionOutputStream =
+            final CompressionOutputStream compressionOutputStream =
                 new CompressionOutputStream(new BufferedOutputStream(byteArrayOutputStream), compressionFormat, level)
         ) {
             int read;
-            byte[] buffer = new byte[1024];
+            final byte[] buffer = new byte[1024];
             while((read = is.read(buffer, 0, buffer.length)) >= 0) {
                 compressionOutputStream.write(buffer, 0, read);
             }
         }
         compressed = byteArrayOutputStream.toByteArray();
 
-        MessageDigest outputDigest = MessageDigest.getInstance("MD5");
-        try(InputStream is = new DigestInputStream(new CompressionInputStream(
+        final MessageDigest outputDigest = MessageDigest.getInstance("MD5");
+        try(final InputStream is = new DigestInputStream(new CompressionInputStream(
             new ByteArrayInputStream(compressed), compressionFormat, StreamMode.DECOMPRESSION), outputDigest)) {
-            byte[] buffer = new byte[1024];
+            final byte[] buffer = new byte[1024];
             while(is.read(buffer, 0, buffer.length) >= 0) {}
         }
         Assertions.assertArrayEquals(inputDigest.digest(), outputDigest.digest());