fixed XML error handler for server command

src/main/kotlin/net/woggioni/gbcs/GradleBuildCacheServer.kt

@@ -507,9 +507,9 @@ class GradleBuildCacheServer(private val cfg: Configuration) {
         val DEFAULT_CONFIGURATION_URL by lazy { "classpath:net/woggioni/gbcs/gbcs-default.xml".toUrl() }
 
         fun loadConfiguration(configurationFile: Path): Configuration {
-            val dbf = Xml.newDocumentBuilderFactory(null)
-            val db = dbf.newDocumentBuilder()
-            val doc = Files.newInputStream(configurationFile).use(db::parse)
+            val doc = Files.newInputStream(configurationFile).use {
+                Xml.parseXml(configurationFile.toUri().toURL(), it)
+            }
             return Parser.parse(doc)
         }
 

src/main/kotlin/net/woggioni/gbcs/configuration/Parser.kt

@@ -19,7 +19,6 @@ import org.w3c.dom.TypeInfo
 import java.nio.file.Paths
 
 object Parser {
-
     fun parse(document: Document): Configuration {
         val root = document.documentElement
         val anonymousUser = User("", null, emptySet())