I need to use the Hibernate´s FilterDef and Filter annotations on my
EntityBean. I configured the annotations but I couldn´t figure out the right
moment to enable it because the EntityManager´s HibernateSession is always a
different instance. I´m using a Stateless Session Bean.
For example, when I get the EntityManager in the first time, I get its
HibernateSession and enable the filter, and this filter doesn´t exists in the
next time I get the same EntityManager in the same SessionBean.
I mean, the HibernateSession that had the filter was lost and I have to enable
it again if I want the filter to work in the same EntityManager instance.
The EntityBean and its annotations:
| @Entity(access = AccessType.FIELD)
| @Table(name = "SOME_OTHER_TABLE")
| @FilterDef(name="FilterDomain", [EMAIL PROTECTED](name="param1"
type="string")})
| @Filters({
| @Filter(name="FilterDomain", condition="RV_MEANING is not null and
RV_LOW_VALUE <> :param1")
| })
| public class Dominio {
| ...
| }
|
The SessionBean and the accessor method to get the EntityManager:
| @Stateless
| public abstract class AbstractController {
| @PersistenceContext(unitName="MyContext",
type=PersistenceContextType.TRANSACTION)
| private EntityManager em;
|
| public EntityManager getEM() {
| //code to enable the EntityBean´s filters
| EMUtil.enableFilters(this.em);
| return this.em;
| }
| }
|
The Utility class to enable the filters:
| public class EMUtil {
| public static void enableFilters(EntityManager em) {
| Session session = ((HibernateSession)em).getHibernateSession();
| Filter filter = session.getEnabledFilter("FilterDomain");
| if (filter == null) {
| //always get into the if, the filter must be enabled every time.
| filter = session.enableFilter("FilterDomain");
| filter.setParameter("param1", "A");
| }
| }
| }
|
I tried to use the javax.ejb.PostConstruct annotation and enabled the filter
there, but I get a javax.persistence.TransactionRequiredException that tells me
the EntityManager must be access within a transaction. And considering my
problem, I believe it would happen the same with the HibernateSession.
Does anyone have an idea or example where I can use the Hibernate´s Filter
annotation without enabling it in the HibernateSession every time I need to use
the EntityManager?
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