Concurrent use of native Hibernate API

mschulz · **Joined:** Sat Jan 31, 2004 7:19 pm **Posts:** 39

Is it posible to use Hibernate a JPA provider and concurrently continue
using the Hibernate-3 API?

What happens to entities of the same name?

I am getting a DuplicateMappingException

Despite using the same Hibernate core code, I would maintain that
there should be no naming conflict possible between these separate domains.
Is this a valid assumption?

Thanks.

cpatni · **Joined:** Sun Apr 22, 2007 12:57 am **Posts:** 7

Quote:

Is it posible to use Hibernate a JPA provider and concurrently continue
using the Hibernate-3 API?

Yes. The Hibernate EntityManager is also instanceof HibernateEntityManager and you can get hibernate session by calling getSession() method on HibernateEntityManager cast.

Quote:

What happens to entities of the same name?

Either user EJB3 annotation or Hibernate mapping. You can mix and match both styles for entities. However, you can't use both for an entity.

emmanuel · **Posted:** Mon Apr 23, 2007 6:15 am

(Session) entityManager.getDelegate();
is the preferred way to get the underlying session.

jstansel · **Joined:** Mon Apr 23, 2007 10:22 am **Posts:** 5

emmanuel wrote:

(Session) entityManager.getDelegate();
is the preferred way to get the underlying session.

I've read that in many places, but was unable to get it to work. I'm using the latest hibernate core, annotations and entitymanager on Glassfish. What I ended up getting to work was

Code:

Session session = ((HibernateEntityManager) em.getDelegate()).getSession();

Even the netbeans wiki page about using the hibernate session with JPA (on glassfish) shows doing it the way emmanuel said.

I feel like a must be missing something. Hopefully I can revisit this sometime.

Regards,

-james.

mschulz · **Joined:** Sat Jan 31, 2004 7:19 pm **Posts:** 39

Quote:

What happens to entities of the same name?

Either user EJB3 annotation or Hibernate mapping. You can mix and match both styles for entities. However, you can't use both for an entity.[/quote]

I think you meant: you can't use the same entity-name for both
mappings, which is what we were doing.

I still hope we can use a different entity name and use the same underlying class from Hibernate and JPA, or can't I?

emmanuel · **Posted:** Tue Apr 24, 2007 4:20 am

jstansel wrote:

emmanuel wrote:

(Session) entityManager.getDelegate();
is the preferred way to get the underlying session.

I've read that in many places, but was unable to get it to work. I'm using the latest hibernate core, annotations and entitymanager on Glassfish. What I ended up getting to work was

Code:

Session session = ((HibernateEntityManager) em.getDelegate()).getSession();

Even the netbeans wiki page about using the hibernate session with JPA (on glassfish) shows doing it the way emmanuel said.

I feel like a must be missing something. Hopefully I can revisit this sometime.

Regards,

-james.

This s a bug in Glassfish, we had the same in JBoss AS some times ago.
http://jira.jboss.com/jira/browse/EJBTHREE-687

Please report that as a bug in Glassfish, so that they fix it. We need to clarify the spec anyway.

jstansel · **Joined:** Mon Apr 23, 2007 10:22 am **Posts:** 5

emmanuel wrote:

(Session) entityManager.getDelegate();
is the preferred way to get the underlying session.

jstansel wrote:

I've read that in many places, but was unable to get it to work. I'm using the latest hibernate core, annotations and entitymanager on Glassfish.

Please report that as a bug in Glassfish, so that they fix it. We need to clarify the spec anyway.

Today I installed the lastest glassfish promoted build, v2-b44, and still see the same error.

Code:

java.lang.ClassCastException: org.hibernate.ejb.EntityManagerImpl

I don't see an existing bug filed in glassfish for this so I'll try to add one, and reply here with issue number.

-james.

jstansel · **Joined:** Mon Apr 23, 2007 10:22 am **Posts:** 5

jstansel wrote:

and reply here with issue number.

glassfish issue 2923: https://glassfish.dev.java.net/issues/s ... gi?id=2923