Use the jar-file tag in persistence.xml: | <persistence> | <persistence-unit name="persistenceunit"> | <jta-data-source>jndiName</jta-data-source> | <properties> | <!-- other properties --> | </properties> | <jar-file>../your-jar-file-thats-also-in-the-root-of-your-ear.jar</jar-file> | </persistence-unit> | </persistence> | View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4126107#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...