diff -r 9b5868bf56ec -r aef4fd91e99c vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java
--- a/vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java	Thu Jan 10 13:09:19 2013 +0100
+++ b/vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java	Thu Jan 10 20:15:11 2013 +0100
@@ -255,7 +255,8 @@
         final byte[] byteCodes = m.getCode();
         if (byteCodes == null) {
             out.append("  throw 'no code found for ")
-               .append(m.getInternalSig()).append("';\n");
+               .append(jc.getClassName()).append('.')
+               .append(m.getName()).append("';\n");
             out.append("};");
             return;
         }