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Date: Mon, 6 Apr 2009 05:10:12 -0700 (PDT)
From: "Michael Vorburger (JIRA)" <jira@apache.org>
To: dev@openjpa.apache.org
Subject: [jira] Updated: (OPENJPA-1021) PersistentMap MapKey applied to a
 relation field as key for a java.util.Map
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     [ https://issues.apache.org/jira/browse/OPENJPA-1021?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael Vorburger updated OPENJPA-1021:
---------------------------------------

    Attachment: Test-OpenJPAPersistentMap.zip

Test case demonstrating the "Map field ...  is attempting to use a map table, but its key is mapped by another field.  Use an inverse key or join table mapping." problem when using a relation field as key for a java.util.Map, using a PersistentMap & MapKey annotation.

> PersistentMap MapKey applied to a relation field as key for a java.util.Map
> ---------------------------------------------------------------------------
>
>                 Key: OPENJPA-1021
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-1021
>             Project: OpenJPA
>          Issue Type: Improvement
>          Components: jpa
>    Affects Versions: 1.2.0
>            Reporter: Michael Vorburger
>         Attachments: Test-OpenJPAPersistentMap.zip
>
>
> I've tried to use a relation field as key for a java.util.Map, using a PersistentMap & MapKey annotation.
> Ideally, such a mapping should be supported of course. For an example real-world use case, see the test case I'll attach (it's the same that I posted to the list last week).
> According to Fay Wang on users@openjpa.apache.org, this is not possible today (v1.2.0), see http://mail-archives.apache.org/mod_mbox/openjpa-users/200904.mbox/%3C188945.43609.qm@web55901.mail.re3.yahoo.com%3E (the short email exchange which lead to the creation of this JIRA).
> According to Pinaki Poddar on http://n2.nabble.com/Map%3CClassA,ClassB%3E-problem-td534546.html this should work. Either way, the current error message ("Map field ...  is attempting to use a map table, but its key is mapped by another field.  Use an inverse key or join table mapping.") is unclear. 
> At the very least, the documentation manual should clearly say that this is explicitly not supported, or include an example if it is, and/or a clear error message should be printed by the run-time. Ideally it should be a working and documenting mapping though...

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