Transactions

All EJB are transactional. If they start in a transaction they automatically are configured inside the transaction. A simple way to manage the transactions is through the SessionSynchronization interface. Here's a stateful sample implementing it:

@Stateful(name = "stateEngineRemote")
publicclass StateEngineRemoteBean implements SessionSynchronization {
   ...
   @Override
   publicvoid afterBegin() throws EJBException, RemoteException {
      logger.info("the bean is begun");
   }
   @Override
   publicvoid beforeCompletion() throws EJBException, RemoteException {
      logger.info("the bean is completing");
   }
   @Override
   publicvoid afterCompletion(booleancommitted) throws EJBException, RemoteException {
      logger.info("the bean is completed");
   }
...}

Here's a transactional client that invokes the EJB:

@Inject
private UserTransaction userTransaction;
@EJB
private StateEngineLocal stateEngineLocal
...
try {
   userTransaction.begin();
   stateEngineLocal.go(1);
   userTransaction...