cascade=REMOVE should not be applied to ManyToMany relations, perhaps you want to change cascade=ALL to a lower level. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3968938#3968938 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3968938