Accessing Hibernate Session from EJB using EntityManager
Is it possible to obtain the Hibernate Session object from the EntityManager? I want to access some hibernate specific API...
I already tried something like:
org.hibernate.Session hSession = ( (EntityManagerImpl) em.getDelegate() ).getSession();
but as soon as I invoke a method in the EJB I get "A system exception occurred during an invocation on EJB" with a NullPointerException
I use glassfish 3.0.1
In JPA 2, the preferred mechanism is entityManager.unwrap(class)
HibernateEntityManager hem = em.unwrap(HibernateEntityManager.class); Session session = hem.getSession();
I think your exception is caused because you are trying to cast to an implementation class (perhaps you were dealing with a JDK proxy). Cast to an interface, and everything should be fine (in the JPA 2 version, no casting is needed).