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https://issues.apache.org/jira/browse/OPENJPA-1061?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12706264#action_12706264
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Pinaki Poddar commented on OPENJPA-1061:
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I have added a new method ClassMetaData.isAbstract() which affirms (in JPA 
context) for MappedSuperclass. This method may help to identify whether a type 
is MSC. 

> Entities extending from a Mapped Superclass that defines the ID fields share 
> the same ObjectID type parameter
> -------------------------------------------------------------------------------------------------------------
>
>                 Key: OPENJPA-1061
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-1061
>             Project: OpenJPA
>          Issue Type: Bug
>          Components: jpa
>    Affects Versions: 1.2.0, 1.2.1
>            Reporter: Jody Grassel
>            Assignee: Jody Grassel
>         Attachments: PCEnhancer.patch, unitttest.patch
>
>
> When a mapped superclass (MSC) defines @Id fields, it appears that entities 
> extending the MSC use the MSC's type in the generated ObjectID's type field.  
> This can result in unexpected primary key collissions between entities that 
> are not intended to be related in an entity inheritance hierarchy.  Attached 
> to the JIRA is a junit test case that demonstrates the problem. 

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