I agree: they should be stateless. And indeed, as a consequence they can be shared by all who needs them. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4211095#4211095 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4211095