diff -r c04c43d5fdc6 -r f78cdceed17b launcher/fx/src/main/java/org/apidesign/bck2brwsr/launcher/fximpl/JsClassLoader.java
--- a/launcher/fx/src/main/java/org/apidesign/bck2brwsr/launcher/fximpl/JsClassLoader.java	Tue Jun 11 09:13:33 2013 +0200
+++ b/launcher/fx/src/main/java/org/apidesign/bck2brwsr/launcher/fximpl/JsClassLoader.java	Wed Jun 12 18:19:29 2013 +0200
@@ -38,10 +38,13 @@
  *
  * @author Jaroslav Tulach <jaroslav.tulach@apidesign.org>
  */
-abstract class JsClassLoader extends URLClassLoader {
-    JsClassLoader(URL[] urls, ClassLoader parent) {
-        super(urls, parent);
+abstract class JsClassLoader extends ClassLoader {
+    JsClassLoader(ClassLoader parent) {
+        super(parent);
     }
+    
+    @Override
+    protected abstract URL findResource(String name);
 
     @Override
     protected Class<?> findClass(String name) throws ClassNotFoundException {