[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-5051) JPA 2 Criteria Query with Object as Parameter not Working

[Gail Badner (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-5051?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=36309#action_36309 ] 

Gail Badner commented on HHH-5051:
----------------------------------

Please attach a runnable test case (Java + mapping) that reproduces this issue.

> JPA 2 Criteria Query with Object as Parameter not Working
> ---------------------------------------------------------
>
>                 Key: HHH-5051
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-5051
>             Project: Hibernate Core
>          Issue Type: Bug
>          Components: entity-manager
>    Affects Versions: 3.5.0-CR-2
>            Reporter: Guido Müller
>            Priority: Blocker
>
> The problem is with this scenario:
> 2 Entity classes A and B
> We have a 1:N relation between A (N) and B (1)
> This test fails:
> I get one instance of B with the entity manager find method.
> I query the database with JPA 2 query to get a list of all instances of A that have the many-to-one property equals the instance got from the 1st step.
> Code:
> EntityManager em = ...
> B b = em.find(B.class, 1L);
> CriteriaBuilder cb = em.getCriteriaBuilder();
> CriteriaQuery<A> q = cb.createQuery(A.class);
> Root<A> p = q.from(A.class);
> q.select(p).where(cb.equal(p.get(A_.b), b));
> List<A> l = em.createQuery(q).getResultList();
> em.close();
> This does not work but it should. It works properly with EclipseLink. In Hibernate I get this to work when I provide b.getId() as Parameter. But this is not correct!

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