(1) No, it can work in 4.0.4, afaik. (2) It should be safe if you use @Synchronized View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3981076#3981076 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3981076