(1) Does User have a natural key or a surrogate key? (2) What is the stack trace? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4016134#4016134 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4016134