entityManager problem

[yarco]

@Service
@Transactional
public class InitialIndexPerformer {

	@PersistenceContext
	transient EntityManager entityManager;

	@PostConstruct
	public void performInitialIndex() throws InterruptedException {
//		entityManager=entityManager.getEntityManagerFactory().createEntityManager();
		Session session = (Session) entityManager.unwrap(Session.class);
		FullTextSession fullTextSession = Search.getFullTextSession(session);
		fullTextSession.createIndexer().startAndWait();
	}
}

If I uncomment the first line in a method, the code works. I found this simply by trial and error.
In this version, it gives me a nasty

java.lang.IllegalStateException: No transactional EntityManager available
    at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:223)
    at $Proxy40.unwrap(Unknown Source)

Exception.

Can anybody explain why? I have @Transaction specified and all... I simply do not know what I am doing wrong and why the trick with

entityManager=entityManager.getEntityManagerFactory().createEntityManager();

worked.

Thank you

[Marten Deinum]

Because it is an @PostConstruct method... That is invoked BEFORE the tranactional proxies are created, hence no transactional entitymanager is available yet.

[cipherchain]

What are the possible issues or downside you get from manually calling "createEntityManager" method in the PostConstruct method? Is there any?

[dsp]

Is PostConstruct even the right place to call something like startAndWait()? What's the best practice for perfroming potentially long-running initialization tasks in EJBs?

[Andrew Swan]

Closing as it's not a Roo issue.