Sounds more like you have an entity with two primary keys. Look if you have @Id defined twice or something like that. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4139695#4139695 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4139695