unintentionally i clicked on submit. here i go on writing: after those changes, if i try to deploy, i am getting these warnings: WARN [Ejb3Configuration] Persistence provider caller does not implements the EJB3 spec correctly. PersistenceUnitInfo.getNewTempClassLoader() is null. WARN [ServiceController] Problem starting service persistence.units:ear=methcancerdb.ear,unitName=methcancerdb javax.persistence.PersistenceException: [PersistenceUnit: methcancerdb] class or package not found Could this be a bug? Or am i doing something wrong? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4054594#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...