Pasquale Imbemba [http://community.jboss.org/people/pi4630] created the discussion "Multiple EntityManagers with different persistence units" To view the discussion, visit: http://community.jboss.org/message/623935#623935 -------------------------------------------------------------- I've defined two persistence units in my persistence.xml: each one with its own data source (one points to an Oracle database on which I do reads, the other points to the HsqlDB I use to write). Entity beans are mapped (by annotations) correctly. In my SLSB I inject two distinct EntityManagers, that refer to the relative name of the persistence units. In my business method, I do a db read using the EntityManager pointing to the OracleDB and then I call a private method, where I instantiate a new entity which corresponds to a table on my HsqlDB. I then pass this object to myHsqlDbEMan.persist() method at the end of the private method. Soon after the methods are terminated (and the server is committing changes to the database), I get the following error: ERROR http://community.jboss.org/message/623935#623935#623935/org.hibernate.uti... Multiple EntityManagers with different persistence units (WorkerThread#0[127.0.0.1:48655]) Could not enlist in transaction on entering meta-aware object!; - nested throwable: (javax.transaction.SystemException: java.lang.Throwable: Unabled to enlist resource, see the previous warnings. tx=TransactionImple < ac, BasicAction: 0:ffff7f000101:126a:4e5def22:c status: ActionStatus.ABORT_ONLY >); - nested throwable: (org.jboss.resource.JBossResourceException: Could not enlist in transaction on entering meta-aware object!; - nested throwable: (javax.transaction.SystemException: java.lang.Throwable: Unabled to enlist resource, see the previous warnings. tx=TransactionImple < ac, BasicAction: 0:ffff7f000101:126a:4e5def22:c status: ActionStatus.ABORT_ONLY >)) 2011-08-31 10:22:49,884 ERROR org.hibernate.event.def.AbstractFlushingEventListener org.hibernate.event.def.AbstractFlushingEventListener (WorkerThread#0[127.0.0.1:48655]) Could not synchronize database state with session: org.hibernate.exception.GenericJDBCException: Cannot open connection How do I handle two different persistence contexts? I've tried to refactor my SB as Stateful and extend the persistence context of both persistence units, but that didn't work (returned same error). I also tried to refactor that writeToDb() to another SessionBean and use the HsqlDB context only there and invoke the method from my other bean, but that didn't work either. I presumed that by using the different EntityManager, the AS would know about which context the method is in. Thanks in advance, -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/623935#623935] Start a new discussion in Beginner's Corner at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]