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Date: Tue, 12 Apr 2011 11:43:05 +0000 (UTC)
From: "Sascha Just (JIRA)" <jira@apache.org>
To: dev@openjpa.apache.org
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Subject: [jira] [Updated] (OPENJPA-1978) Using a MappedSuperclass with
 IdClass causes NullPointerException in OpenJPA when having classes with
 persistent fields of the superclass type.
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     [ https://issues.apache.org/jira/browse/OPENJPA-1978?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sascha Just updated OPENJPA-1978:
---------------------------------

    Attachment: openjpa-nullpointerexception.tar.gz

Maven project containing the 4 annotated test classes and a JUnit test to reproduce the error. The unit test creates a temporary file using File.createTempFile(...) which will be deleted in the @AfterClass method. The test is using a derby file database at the location of the temporary file. 

> Using a MappedSuperclass with IdClass causes NullPointerException in OpenJPA when having classes with persistent fields of the superclass type. 
> ------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: OPENJPA-1978
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-1978
>             Project: OpenJPA
>          Issue Type: Bug
>    Affects Versions: 2.1.0
>         Environment: independent, tested on Mac OS X (10.5/10.6) and Linux 2.6.32
>            Reporter: Sascha Just
>         Attachments: openjpa-nullpointerexception.tar.gz, stacktrace.txt
>
>
> We got a MappedSuperclass A with IdClass APK. The class B extends A using inheritance type 'TAPE_PER_CLASS'. 
> The class C holds a field of type A. OpenJPA crashes with a NullPointerException in org.apache.openjpa.jdbc.meta.MappingInfo#mergeColumn. 
> We tried different annotation strategies to tackle this problem but didn't find a way to get rid of the NullPointerException. While looking at the bug database we found a lot of issues that might be related to this problem but weren't able to track down the cause of the error.
> I will attach a stacktrace and a maven project containing a testcase for the above scenario reproducing the error.

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