Thanks nitros. I thought I will give it a try anyway to see exactly what the issues are. I added the openJPA jars (all of them) to server/lib. But when I deploy my jar containing the entities and persistence.xml, I see following error: ObjectName: persistence.units:unitName=covApiSession | State: FAILED | Reason: java.lang.ClassNotFoundException: No ClassLoaders found for: org.apache.openjpa.persistence.PersistenceProviderImpl This is very strange since all the openJPA jars are in sever/lib dir and I did restart the server. I must be doing something very silly... View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4138525#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...