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

[Jaroslaw Lewandowski (JIRA)]

Entities with compound primary keys are not properly handled when querying metamodel and using Criteria API
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                 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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