the previous message is for deploy phase. I was wrong. From further debug, the exception is thrown in SessionFactoryImp.java throw new HibernateException("The chosen transaction strategy requires access to the JTA TransactionManager"); if ( settings.getTransactionManagerLookup()!=null ) { | log.debug("obtaining JTA TransactionManager"); | transactionManager = settings.getTransactionManagerLookup().getTransactionManager(properties); | } | else { | if ( settings.getTransactionFactory().isTransactionManagerRequired() ) { throw new HibernateException("The chosen transaction strategy requires access to the JTA TransactionManager"); | } | transactionManager = null; | } How to fix it? It seems a configuration issue. Thanks! JBoss: 5.1.0GA. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4266964#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...