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From "Ravi P Palacherla (JIRA)" <j...@apache.org>
Subject [jira] Updated: (OPENJPA-1043) JPQL queries do not support queries on a MappedSuperclass
Date Fri, 24 Apr 2009 21:10:30 GMT

     [ https://issues.apache.org/jira/browse/OPENJPA-1043?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ravi P Palacherla updated OPENJPA-1043:
---------------------------------------

    Attachment: openJPATestcase.zip

OpenJPA testcase where I can query against mappedsuperclass.

> 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
>         Attachments: openJPATestcase.zip
>
>
> 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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