Does anyone know something about this error? It is my first development with ejb3. Is the error related with one to one annotations? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4040910#4040910 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4040910