Look at the examples in the spec and the Java EE 5 Tutorial.
Table and Auto are always available (depending on the provider, Auto might
require some setup if you use an existing database). Sequence and Identity
depend on your database and the way the provider supports them.
HTH,
-marina
Daniel Cavalcanti wrote:
> When you say, strategies, what do you mean? Which ones are available and
> how do I set them up?
> thanks
>
> On 8/17/07, *Marina Vatkina* < Marina.Vatkina_at_sun.com
> <mailto:Marina.Vatkina_at_sun.com>> wrote:
>
> Without the annotation the id will be null, because it's not set.
> With the
> annotation (depending on the strategy), you might need to call
> em.flush() after
> persist() before asking for the generated id.
>
> Regards,
> -marina
>
> Daniel Cavalcanti wrote:
> > I tried with and without that annotation...
> > The result was the same... the Id field had null!
> >
> > On 8/17/07, *Marina Vatkina* < Marina.Vatkina_at_sun.com
> <mailto:Marina.Vatkina_at_sun.com>
> > <mailto: Marina.Vatkina_at_sun.com <mailto:Marina.Vatkina_at_sun.com>>>
> wrote:
> >
> > Daniel,
> >
> > You do not have @GeneratedValue set on the @Id field. Who is
> > expected to
> > populate the value?
> >
> > thanks,
> > -marina
> >
> > Daniel Cavalcanti wrote:
> > >
> > > I have an EJB that persists, updates, removes, etc an
> entity...
> > (create
> > > using NetBeans).
> > > From another EJB, BeanB, I create an entity and use the
> BeanA to
> > persist.
> > >
> > > @Entity
> > > @Table(name = "resource_requests")
> > > public class ResourceRequests implements Serializable {
> > >
> > > @Id()
> > > @Column(name = "id", nullable = false)
> > > private BigInteger id;
> > >
> > > @Column(name = "start_date", nullable = false)
> > > @Temporal(TemporalType.DATE)
> > > private Date startDate;
> > >
> > > ...
> > >
> > > }
> > >
> > > @Stateless()
> > > public class ResourceRequestsBean
> > > implements ... {
> > >
> > > @PersistenceContext()
> > > private EntityManager em;
> > >
> > > public ResourceRequestsFacade() {
> > > }
> > >
> > > public void create(ResourceRequests entity) {
> > > em.persist(entity);
> > > }
> > >
> > > public ResourceRequests edit(ResourceRequests entity) {
> > > return em.merge(entity);
> > > }
> > >
> > > public void destroy(ResourceRequests entity) {
> > > entity = em.merge(entity);
> > > em.remove(entity);
> > > }
> > >
> > > ...
> > >
> > > }
> > >
> > >
> > > @Stateful()
> > > public class SomeBean
> > > implements ... {
> > >
> > > @EJB()
> > > private ResourceRequestsFacadeLocal
> resourceRequestsFacade;
> > >
> > > @EJB()
> > > private ResourcesFacadeLocal resourcesFacade;
> > >
> > > @EJB()
> > > private UsersFacadeLocal usersFacade;
> > >
> > > public void requestValet(Users user, String ticket) {
> > >
> > > //
> > >
> ******************************************************************
> > > // Data tier
> > > //
> > >
> ******************************************************************
> > >
> > > ResourceRequests request = new ResourceRequests();
> > >
> > > request.setStartDate (new
> Date(System.currentTimeMillis()));
> > > request.setResourceId(valet);
> > > request.setUserId (user);
> > >
> > > valet.getResourceRequestsCollection().add(request);
> > > user.getResourceRequestsCollection ().add(request);
> > >
> > > resourceRequestsFacade.create (request);
> > > resourcesFacade.edit(valet);
> > > usersFacade.edit(user);
> > >
> > > request = resourceRequestsFacade.edit(request);
> > >
> > > //
> > >
> ******************************************************************
> > > // Messaging tier
> > > //
> > >
> ******************************************************************
> > >
> > > ...
> > >
> > > }
> > >
> > > }
> > >
> > > Now, in the code after the Messaging tier comments, I need
> the
> > request
> > > entity id... Which is still NULL.
> > > I've tried many different things, but I can't figure out
> how to
> > get the
> > > value persisted in the DB. Furthermore, I can't look that
> entity up
> > > because I don't have the PK?!?
> > >
> > > How can I do that?
> > >
> > >
> >
> >
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