The best thing to do is take some thread dumps when you see the unexpected processor usage. Those should tell you what is running. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4024884#4024884 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4024884