Hi Sami, your bean and persistence.xml in the same jar file ? Your persistence.xml was probably only a snippet ? I miss the xml document root "persistence": <?xml version="1.0" encoding="UTF-8"?> | <persistence xmlns="http://java.sun.com/xml/ns/persistence" | <persistence-unit name="MessageServer" transaction-type="jta"> | ... | </persistence-unit> | </persistence> Hope this helps Wolfgang View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4025849#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...