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https://issues.apache.org/jira/browse/JDO-452?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12525969
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Craig Russell commented on JDO-452:
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> In the case above I assumed that em is a JDOEntityManager of course, but is 
> referenced and used as an EntityManager where possible. Cast to 
> JDOEntityManager is done only when an extension of JDO that is not supported 
> in JPA is needed. Anyway, this should work well with the new interfaces. 

Ah, makes sense now. Thanks for the clarification.

> Provide interfaces that extend both JDO and JPA
> -----------------------------------------------
>
>                 Key: JDO-452
>                 URL: https://issues.apache.org/jira/browse/JDO-452
>             Project: JDO
>          Issue Type: New Feature
>          Components: api2
>    Affects Versions: JDO 2 final
>            Reporter: Michelle Caisse
>            Assignee: Craig Russell
>             Fix For: JDO 2 maintenance release 1
>
>         Attachments: jdo-452.patch, jdo-452.patch
>
>
> Provide interfaces that extend both JDO and JPA in order to make it easier to 
> migrate applications from JDO to JPA.

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