hi everyone, I have some questions about transaction 1 If the db(informix 7) does not support transaction, the session bean's TransactionAttribute must to be not_support?If not, it is required by default. i got a RollbackException. 2 when I test the same method with DefautDS(hypersonic) of JBoss, if TransactionAttribute is not_support, i got exception below, Is it normal? Exception in thread "main" javax.persistence.TransactionRequiredException: EntityManager must be access within a transaction | at org.jboss.ejb3.entity.ManagedEntityManagerFactory.verifyInTx(ManagedEntityManagerFactory.java:150) | at org.jboss.ejb3.entity.TransactionScopedEntityManager.persist(TransactionScopedEntityManager.java:181) | ...... | 3 how can i use these 2 DataSources in one method? I created 2 EntityManager, but there is always an exception because of transaction. thanks in advance liu View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4172031#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...