Is it okay to pass injected EntityManagers to EJB bean's helper classes and use it?
- by Zwei steinen
We have some JavaEE5 stateless EJB bean that passes the injected EntityManager to its helpers.
Is this safe? It has worked well until now, but I found out some Oracle document that states its implementation of EntityManager is thread-safe. Now I wonder whether the reason we did not have issues until now, was only because the implementation we were using happened to be thread-safe (we use Oracle).
@Stateless
class SomeBean {
@PersistenceContext
private EntityManager em;
private SomeHelper helper;
@PostConstruct
public void init(){
helper = new SomeHelper(em);
}
@Override
public void business(){
helper.doSomethingWithEm();
}
}
Actually it makes sense.. If EntityManager is thread-unsafe, a container would have to do
inercept business()
this.em = newEntityManager();
business();
which will not propagate to its helper classes.
If so, what is the best practice in this kind of a situation? Passing EntityManagerFactory instead of EntityManager?
