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Date: Wed, 26 Oct 2011 19:33:32 +0000 (UTC)
From: "Laird Nelson (Commented) (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (OPENJPA-2065) JPA 2.0 Spec. Violation?
 EntityManager#createNamedQuery(String, Class) bombs with non-entity Class
 parameter
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    [ https://issues.apache.org/jira/browse/OPENJPA-2065?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13136258#comment-13136258 ] 

Laird Nelson commented on OPENJPA-2065:
---------------------------------------

That would imply among other things that this too is illegal:

final TypedQuery<Long> q = em.createNamedQuery("someQueryThatReturnsAnAggregateOrCOUNTResult", Long.class);

And this:

final TypedQuery<Object[]> q = em.createNamedQuery("someQueryThatReturnsAnObjectArrayBecauseOfStuffInTheSelectClause", Object[].class);

Is that really the case?  Section 2.11 has very narrow scope.  2.11.3 would seem to have been conceived of within the bounds of that scope, not within the bounds of the entire specification.  Nevertheless, there it is.  That is really unfortunate.  I'll ask the sleepy users@jpa-spec.java.net list, where I appear to be the only poster, what they think.
                
> JPA 2.0 Spec. Violation? EntityManager#createNamedQuery(String, Class) bombs with non-entity Class parameter
> ------------------------------------------------------------------------------------------------------------
>
>                 Key: OPENJPA-2065
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-2065
>             Project: OpenJPA
>          Issue Type: Bug
>          Components: jpa
>    Affects Versions: 2.1.0, 2.1.1
>            Reporter: Laird Nelson
>              Labels: specification
>
> Suppose we have an interface, A.
> Suppose we have a JPA-compliant entity class, B, that implements A.
> This construction will fail at runtime:
> final TypedQuery<A> q = em.createNamedQuery("someNamedQuery", A.class);
> Hibernate and EclipseLink both accept this construction.
> I don't see anywhere in the JPA specification that the class parameter must denote an entity type.

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