Using a MappedSuperclass with IdClass causes NullPointerException in OpenJPA
when having classes with persistent fields of the superclass type.
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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
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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