diff -r 2adac52f955e -r 5452b9fbd253 emul/src/main/java/java/lang/Class.java
--- a/emul/src/main/java/java/lang/Class.java	Sat Dec 29 19:46:09 2012 +0100
+++ b/emul/src/main/java/java/lang/Class.java	Mon Dec 31 12:44:51 2012 +0100
@@ -147,7 +147,7 @@
                 throws ClassNotFoundException {
         Class<?> c = loadCls(className, className.replace('.', '_'));
         if (c == null) {
-            throw new ClassNotFoundException();
+            throw new ClassNotFoundException(className);
         }
         return c;
     }