Persistence context invocation upon application startup

[fady.matar]

I'd like to run a couple of queries in the startup of the application.

The persistence context can be used only in session beans and message
driven beans. Any ideas how to invoke the persistence context or is
there any alternative approach to get hold of the persistence mechanism
upon startup?

Ideally I would like to have something like:

@Scope(ScopeType.APPLICATION)
@Startup
public class QueryStartup extends Jbpm {
@PersistenceContext
EntityManager em;

@Create
public void startup() {
Query q = "some query in here"
em.createQuery(q).getResultList();
}
}

Any suggestions?

[mcanaleta]

Try injecting the entityManager:

@In("entityManager")
private EntityManager em;

It works for me in an application scoped component for initializing purposes, like you need. I'd like to know the difference of injecting it or using the @PersistentContext annotation...

Hope it helps!

[fady.matar]

afaik @PersistentContext can be used only with session beans and message driven beans

[pmuir]

You can use @PersistenceContext (if you make it a @Stateful bean) or @In EntityManager entityManager; if you have an SMPC configured in components.xml

[fady.matar]

That works, thanks

[fady.matar]

One limitation in here, I can query the properly however I cannot save entities the

 em.persist(Object obj)

seems to do nothing, even at the sql logging level I can see all the selects but not inserts.

[fady.matar]

I had to convert the startup POJO into a stateful bean, use the persistence context and now it works like charm.
Thanks again Pete ;-)

[mcanaleta]

I don't need to convert to a Stateful Bean, my POJO can persist entities, i think the difference is that my startup method is annotated @Transactional.