[jboss-user] [EJB 3.0] - Re: EJB 3 + transaction propagation

[charlf]

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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