> If you like to use UserTransactions, then check our JPA module. Guess Gerhard
>added a sample for it.
Sorry I've looked but didn't found it ;(
> On a few servers the EE - injected EMF will only allow you to create managed
>EMs.
What I'm missing is what happens when there's no JTA tx started (i.e. on
RENDER_VIEW when one is calling a lazy association, does the em throws an error
?)
Note : I'm using transaction-type="JTA" on my persistence.xml.
> If you like to use UserTransactions, then check our JPA module. Guess Gerhard
>added a sample for it.
In fact, this is my case (I'm using EJBs for 'service' layer).
If I want a an em with transaction-type="JTA" and requestScoped (i.e. not
having LIE on RENDER_VIEW), I guess I have the following 2 solutions :
Solution 1 : using application managed em
a. have em produced 'a la' softwaremill
b. create a JSF lifecyclelistener using UserTx, and doing something like :
* INVOKE_APLICATION#before : userTx.begin()
* INVOKE_APLICATION#after : userTx.commit() (and test isRollbackOnly)
* RENDER_VIEW#before : userTx.begin()
* RENDER_VIEW #after : userTx.rollback()
c. and a servlet Filter for handling exceptional cases in jsf listener (in case
after is not called) : rollback in those cases
That's a bit overkill for a requestScope em, so I must be missing something.
Solution 2 : use an extendedPersistenceContext with a request scoped statefull
EJB
In fact, this is so simple, it must be the solution in my case
@Stateful
@RequestScoped
public class EntityManagerProducer {
@PersistenceContext(type=PersistenceContextType.EXTENDED private
EntityManager em;
@Produces @RequestScoped
public EntityManager getEntityManager() {
return em;
}
}
Thanks and sorry to deviate from DS stuff - didn't thought so initially !
----- Mail original -----
De : Mark Struberg <[email protected]>
À : "[email protected]" <[email protected]>
Cc :
Envoyé le : Vendredi 24 août 2012 11h47
Objet : Re: RequestScoped entityManager
Well, we might miss some explanation for this lines
> @PersistenceContext(unitName="default")
> private EntityManager entityManager;
This only works in SE. In an EE container you will get a Container Managed EM,
which is not manageable by the user, but strictly bound to EJBs.
Even the sample of softwaremill will not work on every EE container
> @PersistenceUnit(name="pu")
> private EntityManagerFactory emf;
On a few servers the EE - injected EMF will only allow you to create managed
EMs.
The best approach is to either create an additional
EntityManagerFactoryProducer where you can even stuff in JPA properties in a
central place, and inject it via CDI:
> @Inject
> private EntityManagerFactory emf;
Or you can simply do:
> @ApplicationScoped // important!
> public class EntityManagerProducer {
> private EntityManagerFactory emf =
> Persistence.createEntityManagerFactory();
>
> @Produces @RequestScoped
> public EntityManager getEntityManager() {
> return new EntityManagerTxEnlistDecorator (emf.createEntityManager());
> }
>
> public void close(@Disposes EntityManager em) {
> em.close();
> }
> }
>
Please note that this is the classic way to get a non-JTA EM! If you like to
use UserTransactions, then check our JPA module. Guess Gerhard added a sample
for it.
LieGrue,
strub
----- Original Message -----
> From: Adrian Gonzalez <[email protected]>
> To: "[email protected]"
> <[email protected]>
> Cc:
> Sent: Friday, August 24, 2012 11:38 AM
> Subject: RequestScoped entityManager
>
> Hello,
>
> Does DS provides a requestScopes em ?
>
> I tried to to something like https://cwiki.apache.org/EXTCDI/jpa-usage.html,
> but
> I had an error (don't remember which one, I think it was because em
> wasn't associated with current tx)
>
> For the moment, I'm using softwaremill EntityManagerTxEnlistDecorator
> (https://github.com/softwaremill/softwaremill-common/tree/master/softwaremill-cdi/src/main/java/pl/softwaremill/common/cdi/persistence
> and doing something like (I'm doing it from memory so, there can be some
> errors) :
>
> public class EntityManagerProducer {
> @PersistenceUnit(name="pu")
> private EntityManagerFactory emf;
>
> @Produces @RequestScoped
> public EntityManager getEntityManager() {
> return new EntityManagerTxEnlistDecorator (emf.createEntityManager());
> }
>
> public void close(@Disposes EntityManager em) {
> em.close();
> }
> }
>
> Not sure if it deserves a special classe in DS (perhaps at least
> softwaremill EntityManagerTxEnlistDecorator ?)
>
> Thanks
>
