This is interesting: If I changed ClassLoaderJMSWrapper to look on itself besides the delegate, everything works (even with the latest AOP): public Class<?> loadClass(String name) throws ClassNotFoundException | { | try | { | if (name.endsWith("[]")) | { | name = name.substring(0, name.length() - 2); | | //The classloader of an array type is the classloader of it's element (if non primitive) | | Class cl = delegate.loadClass(name); | | Object arr = Array.newInstance(cl, 0); | | return arr.getClass(); | } | else | { | return delegate.loadClass(name); | } | } | catch (ClassNotFoundException e) | { | return super.loadClass(name); | } | } | Now I have a few question: Is there any hacks from javassist involved on calling the classLoader (direct calls to internal methods)? Can you check if you are aways using the correct classloader? This might turn a bug on ClassLoaderJMXWrapper only. We just need to double check. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4142760#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...