Just for the records: the "InstanceAlreadyExistsException" is fixed in 5.0.1GA View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4216726#4216726 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4216726