i was told to inject the entitymanager like this
@ApplicationScoped
public class EntityManagerProducer {
@PersistenceUnit(unitName = "myDb")
private EntityManagerFactory entityManagerFactory;
@Produces
@Default
@RequestScoped
public EntityManager create() {
return this.entityManagerFactory.createEntityManager();
}
public void dispose(@Disposes @Default EntityManager entityManager) {
if (entityManager.isOpen()) {
entityManager.close();
}
}
}
injecting into your example like:
@ApplicationScoped
public class MyRepo1{
@Inject
private EntityManager em;
public List<Something> loadSomeStuff(){ //Non transactional
em.createQuery(....).getResultList();
}
}
also with JSF i alway found @PostConstruct a bit dodgy. way better to add
<f:metadata>
<f:viewAction action="#{myViewBean.onload}" />
</f:metadata>
then in your bean you have an onload function (no annotation necessary)
public String onload() {
someVar1= myRepo1.loadSomeStuff();
someVar2 = myRepo2.loadSomeStuff();
return null; //you can call action here if necessary
}
On 13/02/2018 09:42, cocorossello wrote:
Hi,
Calling entityManager.clear() seems the best approach since most of the
queries are not executed inside a transaction. But I have no idea on where I
should use it or what would be a good implementation pattern.
I mean, let's say I have a @ViewScoped with a couple of injected
@ApplicationScoped.
@ViewScoped
public class MyViewBean{
@Inject
private MyRepo1 myRepo1;
@Inject
private MyRepo2 myRepo2;
@PostConstruct
void init(){
someVar1= myRepo1.loadSomeStuff();
someVar2 = myRepo2.loadSomeStuff();
}
..
}
@ApplicationScoped
public class MyRepo1{
@PersistenceContext(unitName = "myUnit")
private EntityManager entityManager;
public List<Something> loadSomeStuff(){ //Non transactional
entityManager.createQuery(....).getResultList();
}
}
}
So, should I call entityManager.clear() after all non transactional queries
(or at least some of them)? Can I do it in some web filter?
This seems pretty basic stuff but I can't get it right...
--
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