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From "Jeremy Bauer (JIRA)" <j...@apache.org>
Subject [jira] Created: (OPENJPA-1043) JPQL queries do not support queries on a MappedSuperclass
Date Tue, 21 Apr 2009 15:39:47 GMT
JPQL queries do not support queries on a MappedSuperclass
---------------------------------------------------------

                 Key: OPENJPA-1043
                 URL: https://issues.apache.org/jira/browse/OPENJPA-1043
             Project: OpenJPA
          Issue Type: Bug
          Components: jpa
    Affects Versions: 1.2.1
            Reporter: Jeremy Bauer


This issue was reported by Jim Weaver via a nabble user forum post[1].  The JPA specification
clearly states that queries upon a mapped superclass are not permitted, but the OpenJPA documentation
has a note saying that they are supported[2].

Given:
@MappedSuperclass class A { }
@Entity class B extends A { }
@Entity class C extends A { }

I found that:

a) The em.find(A.class, id) operation does indeed allow the use of mapped superclass. OpenJPA
issues a select upon tables B and C looking for a matching ID.
b) A JPQL query does not:  SELECT a FROM A a  fails with exception: (as reported by Jim)

I receive error message "An error occurred while parsing the query filter
"SELECT a FROM A a".  Error message:   The name "A" is not a recognized
entity or identifier.  Perhaps you meant B, which is a close match.  Known
entity names: [B, C]"

I attempted the same test with the OpenJPA base 1.0 provider and it failed with the same error
so it doesn't look like this was ever supported via. JPQL.

If the decision is made not to provide this support in the near future, the documentation
should be updated to qualify that mapped superclass is only allow on a find.

[1] http://n2.nabble.com/Can%27t-query-against-a-MappedSuperclass-tp2665700p2665700.html
[2] http://openjpa.apache.org/builds/latest/docs/manual/manual.html#jpa_overview_meta_embeddablesuper

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