[jboss-user] [EJB] - Transaction and EJB3 Singleton

[sandello]

I have a ejb3 project with managed singleton:

  | @Service (name = ProfileStateMachine.NAME, objectName = "vis:service=StateMachine")
  | @Management (IMainStateMachine.class)
  | @Remote (ProfileStateMachine.class)
  | public class MainStateMachine implements IMainStateMachine, ProfileStateMachine {
  |   @PersistenceContext (unitName = "vis")
  |   private EntityManager entityManager;
  | 
  |   void start(){
  |     SomeEntity  entity1=entityManager.find(SomeEntity.class,2);
  | 
  |     SomeEntity entity2=new SomeEntity();
  |     entity2.setFieldOne("one");
  |     entity2.setFiledTwo("two");
  |     entityManager.persist(entity2);
  |   }
  | 
  |   void stop(){
  |   }
  | }
  | 
interface IMainStateMachine

  | public interface IMainStateMachine {
  |   void start();
  | 
  |   void stop();
  | 
  | }

I receive a exception during project deployment

  | Caused by: javax.persistence.TransactionRequiredException: EntityManager must be access within a transaction
  | 	at org.jboss.jpa.deployment.ManagedEntityManagerFactory.verifyInTx(ManagedEntityManagerFactory.java:155)
  | 	at org.jboss.jpa.tx.TransactionScopedEntityManager.persist(TransactionScopedEntityManager.java:186)
  | 
The exception is thrown at the persist command

  | entityManager.persist(entity2);
  | 

I think the start() method is executed before the project was deployed. Same operation ("entityManager.persist()") works well if it is executed after deploy.

My project has a three stage: starting, working, stopping. I need to use EntityManager during all stages. What I should do to solve the problem?

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