If your persistence.xml is not in the same archive as your entity classes you might need to explicitly include class elements for the mapped classes e.g. | <jta-data-source>...stuff...</jta-data-source> | | <class>com.myco.model.Role</class> | <class>com.myco.model.User</class> | | <properties>...stuff...</properties> | Cheers J View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4113334#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...