You have to specify the entity class on the convertentity tag. It can not automatically detect the entity class of a collection. Regards Felix View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4088407#4088407 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4088407