correct usage of EntityManager in a thread under JBossAS 4.

[guava]

Hi,

I'm looking for a correct way to use an EntityManager inside a thread of JBossAS. I have a EJB3 service object that spins a thread to handle a request. Inside the thread I need to perform a named query using an EntityManager. I tried passing an EntityManager that was obtained using injection in the service object or an EntityManager that was obtained using JNDI lookup inside the thread. But whichever EntittyManager that I obtained, I always get the following error when performing .createNamedQuery on the EntityManager. Any suggetion?

23:50:53,765 ERROR [STDERR] java.lang.NullPointerException
23:50:53,765 ERROR [STDERR] at org.jboss.ejb3.entity.ManagedEntityManagerFactory.getNonTxEntityManager(ManagedEntityManagerFactory.java:59)
23:50:53,765 ERROR [STDERR] at org.jboss.ejb3.entity.ManagedEntityManagerFactory.getTransactionScopedEntityManager(ManagedEntityManagerFactory.java:164)
23:50:53,765 ERROR [STDERR] at org.jboss.ejb3.entity.TransactionScopedEntity
Manager.createNamedQuery(TransactionScopedEntityManager.java:132)
23:50:53,765 ERROR [STDERR] at coco.nms.router.HeartbeatPacketWorker.getRouter(HeartbeatPacketWorker.java:92)

[smeverts]

Sorry to resurrect a dead topic but I too have a need for this same type of behavior. Has anyone figured out how to do this? Is there a better way of doing this?

[wolfgangknauf]

Hi,

if you also use threads like the initial poster, this should answer the question:
http://stackoverflow.com/questions/976541/how-to-process-data-in-multiple-threads-using-ejb3

So you have to change your concept. Probably your error is a result of using disallowed threading.

Best regards

Wolfgang