are you using those object in the detached state? Then yes you need to implement a proper equals/hashcode impl View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3961615#3961615 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3961615