[JPA] Invalidate TopLink Essentials' L2 cache. How?

Question

Hi,
I'm trying to invalidate the L2 cache of TopLink Essentials. In Java SE, I try something like this:
     Customer cust = em.find(Customer.class, 1L);
     System.out.println(cust);
     em.clear();
     em.close();
     em = emf.createEntityManager();
     Session session = ((EntityManagerImpl)em).getSession();
     session.getIdentityMapAccessor().invalidateAll();
     cust = em.find(Customer.class, 1L);
     System.out.println(cust);The trouble is that only ONE SQL statement is generated, not two, as I would have expected.
In Oracle Application Server, I cannot even get this far because I cannot cast to EntityManagerImpl. There, the class hierarchy is:
     com.evermind.server.ejb.persistence.EntityManagerProxy
            implements com.evermind.server.ejb.persistence.ContainerEntityManager
     com.evermind.server.ejb.persistence.AbstractEntityManagerProxy
            implements javax.persistence.EntityManager
     java.lang.ObjectSo, how can I do this in Java SE and in a container?
Best regards,
Bisser

Answer 1

Hello Bisser,
getSession() only returns the active session (the underlying UnitOfWork) if one is available or null if not. Use getServerSession() instead.
As for in the container, you need to call getDelegate() to get the wrapped entitymanager.
Best Regards,
Chris