anonymous wrote : I tracked the error, and found ScopedClassPool returned by javassist is empty Yes, that's exactly what I thought was happening. I am afraid that JBoss AOP is getting confused when it assumes that, if your class loader is able of loading a class, it should be able of returning the class file resource url through getResource. Please, confirm that this method is being called. Just overwrite it with something like this: | public URL getResource(String name) | { | (new Exception()).printStackTrace(); | return super.getResource(name); | } | And let me know, if it does get called, the stack trace you're getting. (it will probably start with a call from AOPClassPool.isLocalResource method). Another interesting test would be to replace compile-time weaving (with aopc) by load-time weaving (with -javaagent option enabled). If my theory is right, the bug won't happen in load-time weaving. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4150483#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...