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https://issues.apache.org/jira/browse/OPENJPA-1360?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12770234#action_12770234
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Laird Nelson commented on OPENJPA-1360:
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It looks like, at least for the annotations path,
AnnotationPersistenceMetaDataSerializer is the culprit. At line 202 or
thereabouts, in the isMappingMode(ClassMetaData meta) method, it includes a
check to see if the supplied meta isEmbeddedOnly(). If it is, then there is
nothing else you can do from the standpoint of your ReverseCustomizer: that
metdata is deemed to NOT be in mapping mode. That of course means that when
the Java code is written out, all fields are output with only a @Basic
annotation and nothing else.
The (rather cumbersome) workaround is to subclass both this serializer and
PersistenceMappingFactory and supply a PersistenceMappingFactory implementation
that returns new instances of an AnnotationPersistenceMetaDataSerializer that
is capable of omitting this isEmbeddedOnly() check from its own implementation
of the isMappingMode(ClassMetaData meta) method.
> ReverseMappingTool omits nullable, length, etc. when
> ClassMapping.setEmbedded(true) is called
> ---------------------------------------------------------------------------------------------
>
> Key: OPENJPA-1360
> URL: https://issues.apache.org/jira/browse/OPENJPA-1360
> Project: OpenJPA
> Issue Type: Bug
> Components: tooling
> Affects Versions: 1.3.0, 2.0.0
> Reporter: Laird Nelson
>
> In my ReverseCustomizer, I call classMapping.setEmbedded(true). This is
> because for a variety of reasons I need the code that is generated by the
> ReverseMappingTool to be @MappedSuperclasses, not @Entities.
> Indeed when I do this, the resulting class is a @MappedSuperclass (great!)
> BUT all of the length and nullable and other @Column attributes are missing.
> In other words, all simple fields receive only a @Basic annotation, with no
> attributes, and nothing else. In addition, the class declaration receives a
> @Table annotation with no attributes. (I'm using the command line flag that
> instructs the ReverseMappingTool to generate annotations.)
> Ideally I'd like the generated source code to look identical to the source
> code that would be generated for a ClassMapping where setEmbedded(true) was
> never called, except of course that I want the @Entity annotation to be
> replaced with @MappedSuperclass.
> Obviously if there is a better way from within a ReverseCustomizer for me to
> accomplish my (very odd) goals (mandated by a strange development process and
> a 30-year-old database), I am all ears.
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