7 Replies Latest reply on Jul 28, 2006 9:17 PM by gavin.king

Mixing Hibernate & EJB3

mschmidke Jul 27, 2006 8:18 AM

Hello,

I would like to directly access the Hibernate behind JBoss' EJB3 implementation. Usually, this is no problem since I can inject from a PersistenceContext into a Hibernate Session Object:

@PersistenceContext(unitName = "LeistungserfassungEntityManager")
protected Session leDB;

Now I want to migrate to Seam-managed Hibernate Session (inside EJB3!), but I don't understand how to adapt chapters 9.4.2 / 9.5.2 to get this running.

Is this possible? Can someone give me an example of how to configure it?

Regards,

Marcus.

1. Re: Mixing Hibernate & EJB3

gavin.king Jul 27, 2006 8:25 AM (in response to mschmidke)

Yes, of course it is possible, straightforward in fact. Just

(1) install a Seam-managed session in components.xml
(2) inject it using @In(create=true) mySessionComponentName
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2. Re: Mixing Hibernate & EJB3

mschmidke Jul 27, 2006 8:34 AM (in response to mschmidke)

Yes ... but which sessionFactoryJndiName do I have to use in components.xml? Where do I have to configure the "counterpart" (since, of course, I don't have a hibernate.cfg.xml file)?

Perhaps ... I'll try leaving out the sessionFactoryJndiName property ... maybe there is an automatic default?

Marcus.
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3. Re: Mixing Hibernate & EJB3

gavin.king Jul 27, 2006 8:52 AM (in response to mschmidke)

You _will_ need a hibernate.cfg.xml, of course!
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4. Re: Mixing Hibernate & EJB3

mschmidke Jul 27, 2006 9:23 AM (in response to mschmidke)

"gavin king" wrote:
You _will_ need a hibernate.cfg.xml, of course!

Will I? But ... until now, I never needed one. persistence.xml was all I had.

Ok, when I create one, will I only have to put this session-factory entry into it? Or will I have to move configuration parameters from persistence.xml into hibernate.cfg.xml?

persistence.xml:

<?xml version="1.0" encoding="UTF-8"?>

<persistence>
 <persistence-unit name="LeistungserfassungEntityManager">
 <jta-data-source>java:/LeistungserfassungDS</jta-data-source>
 <properties>
 <property name="hibernate.hbm2ddl.auto" value=""/>
 <property name="hibernate.show_sql" value="true"/>
 <property name="hibernate.dialect" value="org.hibernate.dialect.OracleDialect" />
 <property name="hibernate.max_fetch_depth" value="0" />
 <property name="hibernate.default_batch_fetch_size" value="100" />
 <property name="hibernate.use_sql_comments" value="true" />
 <property name="hibernate.bytecode.use_reflection_optimizer" value="false" />
 </properties>
 </persistence-unit>
</persistence>

5. Re: Mixing Hibernate & EJB3

robjellinghaus Jul 28, 2006 1:34 AM (in response to mschmidke)

Personally I am doing it this way:

/**
 * Tiny sugar class for getting the hibernate session from an EntityManager.
 */
public class GetHibernateSession {
 // wow, cool idiom!
 private static final Logger log = Logger.getLogger(new Throwable().getStackTrace()[0].getClass());

 private GetHibernateSession () { }

 public static Session get (EntityManager entityManager) {
 Session delegate = (Session)entityManager.getDelegate();
 return delegate;
 }
}

Use like so:

GetHibernateSession.get(entityManager).enableFilter("priorChangeset")
 .setParameter("changeset_id", changeset.getId());

Works for me :-) And no need for hibernate.cfg.xml when I already have a persistence.xml....

Cheers!
Rob

6. Re: Mixing Hibernate & EJB3

mschmidke Jul 28, 2006 2:31 AM (in response to mschmidke)

Great ...

Did not know that Hibernate Session is that simply available.

Works great! This is the right solution for such small-brained people like me.

Thank you very much!

Marcus.
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7. Re: Mixing Hibernate & EJB3

gavin.king Jul 28, 2006 9:17 PM (in response to mschmidke)

Personally I am doing it this way:

Even better, do that stuff in an @Unwrap method on a Seam component, and you can inject the wrapped Hibernate session using @In.
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