[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-5938) Entities with compound primary keys are not properly handled when querying metamodel and using Criteria API

[Jaroslaw Lewandowski (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-5938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=40024#action_40024 ] 

Jaroslaw Lewandowski commented on HHH-5938:
-------------------------------------------

Of course there is missing @IdClass annotation in the example :)

> Entities with compound primary keys are not properly handled when querying metamodel and using Criteria API
> -----------------------------------------------------------------------------------------------------------
>
>                 Key: HHH-5938
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-5938
>             Project: Hibernate Core
>          Issue Type: Bug
>    Affects Versions: 3.6.0
>            Reporter: Jaroslaw Lewandowski
>
> Suppose we have entity defined like this:
> {code}
> @Entity
> class Foo {
> @Id Long first;
> @Id Long second;
> ....
> }
> {code}
> Then the following code will fail:
> {code}
> Metamodel mm = entityManager.getMetamodel();
> EntityType<Foo> foo_ = mm.entity(Foo.class);
> foo_.getSingularAttribute("first", Long.class);
> foo_.getSingularAttribute("second", Long.class);
> {code}
> The same problems exists trying to query this entity:
> {code}
> CriteriaBuilder cb = entityManager.getMetamodel();
> CriteriaQuery<Foo> cq = cb.createQuery(Foo.class);
> Root<Foo> foo = cq.from(Foo.class);
> cq.where(cb.equal(foo.get("first"), 1L), cb.equal(foo.get("second"), 2L));
> {code}
> See that attributes are accessed by name. In the first example IllegalArgumentException is thrown in second NPE

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