diff -r 0a582b5a2737 -r 388e48c0a37a emul/src/main/java/java/lang/ClassLoader.java
--- a/emul/src/main/java/java/lang/ClassLoader.java	Tue Oct 30 09:24:41 2012 +0100
+++ b/emul/src/main/java/java/lang/ClassLoader.java	Wed Jan 23 20:16:48 2013 +0100
@@ -29,6 +29,7 @@
 import java.net.URL;
 import java.util.Enumeration;
 import java.util.NoSuchElementException;
+import org.apidesign.bck2brwsr.core.JavaScriptBody;
 
 /**
  * A class loader is an object that is responsible for loading classes. The
@@ -147,6 +148,7 @@
  */
 public abstract class ClassLoader {
 
+    @JavaScriptBody(args = {}, body = "")
     private static native void registerNatives();
     static {
         registerNatives();