1 Reply Latest reply on Dec 11, 2008 5:32 AM by charlf

    EJB 3 + transaction propagation

    david81
    david81 Nov 27, 2007 12:36 AM

      Hi ,

      I am stuck in an issue and need your help on it.

      I have an ejb (Bean1) where in a transaction is started.
      From this ejb (Bean1) if I call another ejb(Bean2), and anything wrong happens in Bean2, whole of the transaction is rolled back.
      This is controlled by the Jboss.

      My query is..
      If from Bean1, I make a call to some utility class which makes entires into DB and if an error happens in Bean1 , after utility class commits the DB changes. How can I rollback the changes made in utility class.

      In short, how is the transaction in EJB3 propagated to utility class?

      I am using hibernate in utility class and the application server used is JBoss4.

      I set hibernate.transaction.manager_lookup_class
      and set hibernate.transaction.factory_class to org.hibernate.transaction.JTATransactionFactory

      My code in utility class..

      UserTransaction tx = (UserTransaction)new InitialContext()
      .lookup("java:comp/UserTransaction");


      try {
      tx.begin();

      // Do some work
      saved object using hibernate session

      tx.commit();
      }
      catch (RuntimeException e) {
      tx.rollback();
      throw e; // or display error message
      }


      The logs show issue with tx.begin(); statement..

      javax.transaction.NotSupportedException
      at com.arjuna.ats.internal.jta.transaction.arjunacore.BaseTransaction.begin(BaseTransaction.java:79)

      and on the screen I get error
      java.lang.IllegalStateException: Wrong tx on thread: expected TransactionImple < ac, BasicAction: -3f5702b4:390d:474aea8d:77 status: ActionStatus.ABORTED >, actual null
      at org.jboss.aspects.tx.TxPolicy.endTransaction(TxPolicy.java:162)
      at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:87)




      Can you please tell what could be the problem?

      Any help will be greatly appreciated.

      Thanks,

      David

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        • 1. Re: EJB 3 + transaction propagation
          charlf
          charlf Dec 11, 2008 5:32 AM (in response to david81)

          Hey all,

          I also got this error when using the TransactionManager, which is about the same as the UserTransaction.

          The problem was that I was using the the TM while it was still busy with another transaction, you have to check the status of the TM first. heres how I fixed it.

          EntityManager EM = EMF.createEntityManager();
TransactionManager TM = (TransactionManager)ctx.lookup("java:TransactionManager");
boolean suspended = false;
Transaction t = null;

if(TM.getStatus() == Status.STATUS_NO_TRANSACTION || TM.getStatus() == Status.STATUS_UNKNOWN)
{
 TM.begin();
 EM.joinTransaction();
}
if(TM.getStatus() == Status.STATUS_ACTIVE)
{
 suspended = true;
 t = TM.suspend();
 TM.begin();
 EM.joinTransaction();
}
else
{
 throw new Exception("Transaction status invalid: "+TM.getStatus());

}

//Do Actual Work with DB

EM.persist(Entity);
EM.flush();
TM.commit();

if(suspended == true)
{
 TM.resume(t);
}

TM = null;
EM = null;


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