Re: [eclipselink-users] Eclipselink mapping question

[Gordon Yorke <gordon.yorke@xxxxxxxxxx>]

Hello Leon,
  Are you using the @Inheritance annotation?  Set this annotation on 
your CatalogProduct Entity.  That will tell EclipseLink that this is the 
root of your inheritance.
--Gordon

Leon Derks wrote:
> Hello Tom,
>
> Thanks for your answer,
>
> I have to other concrete classes that inherit from my CatalogProduct 
> class, so the @DiscriminatorColumn(name="PRODUCT_TYPE") is needed in 
> my CatalogProduct in order to instantiate the concrete subclass.
>
> I temporary solved the issue by removing the BaseEntity and adding an 
> extra id variable in each Entity class.
>
> But after that, it is still not working with Eclipselink. The strange 
> thing is that it is working with Hibernate.
>
> See my previous mail for more details.
>
> Leon
>
> Tom Ware wrote:
> > Hi Leon,
> >
> >   I suspect that removing the 
> > @DiscriminatorColumn(name="PRODUCT_TYPE") annotation will solve your 
> > problem.
> >
> >   In this case it looks to me like you are trying to inherit an 
> > attribute rather than implement inheritance.  The DiscriminatorColumn 
> > is used for JPA Inheritance.
> >
> > -Tom
> >
> > Leon Derks wrote:
> > > Hello
> > >
> > > I have the following problem:
> > >
> > > I defined a BaseEntity for all my Entity classes. This BaseEntity 
> > > class contains only the id.
> > > In this way I don't need to define id variables in every Entity class.
> > >
> > > I have a CatalogProduct class which extends the BaseEntity class.
> > > But when I run the query for an entity, for example: 
> > > em.createQuery("select p from CatalogProduct p").getResultList(), it 
> > > always tries to select from the BaseEntity table which doesn't exist.
> > >
> > > What is causing the problem?
> > >
> > > @MappedSuperclass
> > > public abstract class BaseEntity {
> > >      @Id
> > >    @Column(name="id")
> > >    private long id;
> > >
> > >    public long getId() {
> > >        return id;
> > >    }
> > >
> > > }
> > >
> > > @Entity
> > > @Table(schema="PLI", name = "PLI_CATALOG_PRODUCTS")
> > > @DiscriminatorColumn(name="PRODUCT_TYPE")
> > > public abstract class CatalogProduct extends BaseEntity{
> > >   ......
> > >   ......
> > > }
> > >
> > > Leon
> > > _______________________________________________
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> > > eclipselink-users@xxxxxxxxxxx
> > > https://dev.eclipse.org/mailman/listinfo/eclipselink-users
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>
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