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https://issues.apache.org/jira/browse/OPENJPA-1397?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12792658#action_12792658
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Xiaoqin Feng commented on OPENJPA-1397:
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If you have any question on deployment and JEE bugs, please contact Saurabh
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> NULL in columns part of an @IdClass composite key leads to "disappearing"
> (null) returned objects
> -------------------------------------------------------------------------------------------------
>
> Key: OPENJPA-1397
> URL: https://issues.apache.org/jira/browse/OPENJPA-1397
> Project: OpenJPA
> Issue Type: Bug
> Components: jdbc, kernel
> Affects Versions: 1.2.1, 2.0.0-M3
> Reporter: Michael Vorburger
> Assignee: Pinaki Poddar
> Fix For: 1.2.2, 1.3.0, 2.0.0
>
> Attachments: openJPA_NullId.zip
>
>
> As discussed on
> http://openjpa.markmail.org/search/?q=#query:list%3Aorg.apache.openjpa.users+page:1+mid:yua5kf7vd5m7wrnw+state:results,
> there is a bug in OpenJPA iff ... "any @Id field of a composite key mapped
> via an @IdClass identity is NULL" (enough keywords to allow future searching?
> ;).
> The attached test case provides running code illustrating this with two
> simple entities and a failing JUnit.
> While relational database do NOT appear to allow NULL value for columns which
> are part of a PRIMARY KEY CONSTRAINT, this kind of situation and mapping can
> (and in our case has!) occurred when mapping to legacy schemas with tables
> where a certain number / subset of columns are in fact the "logical"
> identifying set, without there being a physical PK constraint (nothing says
> you HAVE to have a physical PK). -- Both JPA Spec and OpenJPA doc make no
> statement if this is supposed to work or not work, they say nothing about
> this (as far as I could see; I checked before filing this; and nobody on the
> list made any statements re. this). It would be interesting to know if and
> how other JPA implementations handle this.
> Assuming this is a small internal implementation bug and not a conceptual /
> design issue (note it's NOT the @IdClass instance that is null, it's only
> some fields within an Id, with others being available; and uniqueness of the
> combination guaranteed by data in DB of course!), it would be great if this
> could be make to work as one would naturally expect. (Or, at the very least,
> OpenJPA should fail and issue a clear error message, instead of just
> returning null; fix much better though.)
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