FileLocator: docs about ClassLoaders

Author: pavly-gerges

snaploader/src/main/java/electrostatic4j/snaploader/filesystem/FileLocator.java

@@ -152,11 +152,15 @@ public void initialize(int size) throws IOException {
     protected void classPathRoutine() {
         SnapLoaderLogger.log(Level.INFO, getClass().getName(), "initialize(int)",
                 "File locator initialized using classpath routine with hash key #" + getHashKey());
-        // use the AppClassLoader, a BuiltinClassLoader to get the resources from the classpath
+        // Use the AppClassLoader, a BuiltinClassLoader to get the resources from the classpath
         // notice that the JVM Classloaders are arranged in a tree-like structure
         // 1) The BootStrap ClassLoader is the most ancestor
         // 2) The Java Platform ClassLoader is the next in the tree.
         // 3) The AppClassLoader is the last in the tree.
+        // So, each one backs up to its ancestor!
+        // However, all those classloaders are loaded by the BootStrap, so if
+        // getClassLoader() is invoked on them, it will return "null" pointer
+        // indicating the invalidity of active loaders
         this.fileInputStream = getClass().getClassLoader().getResourceAsStream(filePath);
     }