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https://issues.apache.org/jira/browse/OPENJPA-1508?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12833153#action_12833153
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B.J. Reed commented on OPENJPA-1508:
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Forgot to mention that one work around we found for this problem is that if
both Lower entities use LAZY fetches in stead of EAGER fetches, then the
exception won't be thrown.
> ArrayIndexOutOfBoundsException being thrown from
> ClassMetaData.getExtraFieldDataIndex()
> ---------------------------------------------------------------------------------------
>
> Key: OPENJPA-1508
> URL: https://issues.apache.org/jira/browse/OPENJPA-1508
> Project: OpenJPA
> Issue Type: Bug
> Components: jdbc
> Affects Versions: 1.2.2
> Environment: found this on DB2, but I imagine it doesn't matter
> Reporter: B.J. Reed
> Fix For: 1.2.3, 1.3.0, 2.0.1, 2.1.0
>
> Attachments: tc.zip
>
>
> An ArrayIndexOutOfBoundsException is being thrown by
> ClassMetaData.getExtraFieldDataIndex()
> I am providing a test case. The only thing special is that the entities are
> set up in a hexagon shape, where the entities above have a OneToMany
> relationship with those below. The one at the very bottom has ManyToOne
> relationships with the two entities above it and I think this seems to be the
> cause of the problem.
> I have done some debugging on this and here is where I have gotten to:
> The problem is somewhere around the JDBCStoreManager.initializeState method
> first time through, the mapping object is
> org.apache.openjpa.persistence.jdbc.query.HexagonBottom and the
> mappedByFieldMapping is
> org.apache.openjpa.persistence.jdbc.query.HexagonBottom.lowerLeftId (looks
> good), index is 6
> second time through, the mapping object is
> org.apache.openjpa.persistence.jdbc.query.HexagonLowerRight and the
> mappedByFieldMapping is still
> org.apache.openjpa.persistence.jdbc.query.HexagonBottom.lowerLeftId, so the
> index is still 6, but the HexagonLowerRight object only has 4 fields in it so
> the exception is thrown.
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