Comments on: Co-existence with Hibernate, JPA, and EJB3

By: Carlos Rafael Ramirez

Carlos Rafael Ramirez — Mon, 03 May 2010 21:05:48 +0000

Bill Very good post thanks,

One question for you.

If I use a JTA transaction either Entityanager or Hibernate session behave in same way.

But if I annotate the method using:

@TransactionAttribute(TransactionAttributeType.NOT_SUPPORTED) (I don’t want to use transactions)

the entityManager.find method and session.get method with same parameters behave different due to, the object returned by find method throws Lazy exceptions in collections (in the same method in session bean) and the object obtained via get method behaves without problem.

Any explanation for this strange behaviour?

Regards,
Carlos

By: Michael Chang

Michael Chang — Tue, 23 Mar 2010 18:19:06 +0000

Bill,

Nice post, thanks. It was exactly what I was looking for: a way to mix and match JPA and pure Hibernate. JPA is fine, and I’m using it exclusively in an application right now. However, I’ve recently seen the power of the Hibernate Criteria API as well as the Hibernate JPA extensions, and it’s inspired me to attempt to mix the two together, especially in my service layer where I do all of my CRUD. Hibernate is an old player in the ORM world, and it’s got tricks up its sleeves that JPA can’t match.

By: Sylvie

Sylvie — Mon, 13 Jul 2009 08:01:26 +0000

Thanks.

I try to make a basic web application based on JAVA , JSP , Servlet , EJB3.0 , hibernate … using Eclipse Ganymede AS5.0 , and so on …and I found this is quite complicated to get the information I need .

So many thanks to make thinks clearer.

By: Alessandro Ilardo

Alessandro Ilardo — Sun, 28 Jun 2009 12:17:35 +0000

Someone pointed out that the following method is not portable across different application servers using Hibernate.
What’s your consideration? Which approach would you suggest if we want to obtain such object from the entity manager.
BTW, great article.

org.hibernate.Session session = (Session)manager.getDelegate();

By: Jing

Jing — Mon, 15 Jun 2009 08:03:53 +0000

Bill, thanks for the post, it’s quite helpful! I am wonder if Jboss has a way to support multiple persist unit WITHOUT Seam? such as has multiple data source in oracle-ds.xml, and map to persistence.xml as multiple , I guess need , and use EntityManager em = (EntityManager) context.lookup(MyEntityManger);

I tried that, but only got the first manager in the list, do I have to use Seam and component.xml?
Can you post the implementation if there is a way?

Thanks

By: Ray

Ray — Sun, 16 Mar 2008 11:28:43 +0000

Thanks for that info Bill, I’m liking Hibernate over JPA already )

By: billburke

billburke — Sat, 15 Mar 2008 16:43:20 +0000

Ray, why Hibernate of JPA. Hibernate is a superset of JPA. it has things like a Criteria API and more complex mapping options than JPA as well as funkier caching strategies like query caching.

By: Ray

Ray — Sat, 15 Mar 2008 12:42:53 +0000

Thanks for such a great post Angry Bill! I’m new to Hibernate, JPA & EJB3 and with so many options it can be quite difficult to get an understanding of how to integrate the API’s and which strategy to use. Do you know of a resource that gives info on reasons to choose Hibernate over the standard JPA?

By: Carol

Carol — Mon, 23 Jul 2007 14:55:00 +0000

query.setHint(“org.hiberante.cacheable”, true);

Small correction
query.setHint(“org.hibernate.cacheable”, true); ?