User development, A new message was posted in the thread "Problem deploying EJB 3.0 jar to JBoss 5.0.1 GA": http://community.jboss.org/message/521921#521921 Author : jaikiran pai Profile : http://community.jboss.org/people/jaikiran Message: -------------------------------------------------------------- Have you placed the persistence.xml in the model-ejb.jar/META-INF folder?   P.S: I would recommend that you upgrade to the latest stable 5.1.0 version of the AS. -------------------------------------------------------------- To reply to this message visit the message page: http://community.jboss.org/message/521921#521921