Any pointer on how to debug such issue would be appreciated, too. (the verbose:class option didn't help me much) Thanks for your inputs! The only thing I can think of is doing a real debug by attaching a debugger or looking a log4j.trace logs. I would also look if Sun AS is setting Thread.currentClassLoader properly, as AOP is probably going to use that. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4225461#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...