Yep, that's the optimization I was talking about. I knew it existed but wasn't sure exactly where the code was or whether it checked for Advised. I'm not sure if if(oldValue == obj && obj instanceof Advised) return obj; is sufficient, or if there needs to be some special handling of Collection and Map. Well, Jason can sort that one. :-) Thanks for the report. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4032944#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...