Hi When the entity manager is injected, it is managed by the container, and you should not close it yourself. /Michael View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3991648#3991648 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3991648