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From "Mark Struberg (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (OPENJPA-2405) EntityManager.merge does not work for entity that is managed by another EntityManager
Date Fri, 28 Jun 2013 19:16:20 GMT

    [ https://issues.apache.org/jira/browse/OPENJPA-2405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13695690#comment-13695690
] 

Mark Struberg commented on OPENJPA-2405:
----------------------------------------

Jody, I'm not sure if the Entity of such a unsynchronized CMTS EM would be 'detached'. At
least according to what I talked with Mike Keith (assuming that I didn't misunderstand him)
lazy loading and graph traversal would work for such entitites.

I agree with your 2nd part. Having the same db row managed in 2 different EMs will either
not see each other properly or if they do (update case) most likely cause an OptimisticLockingException
in one of them - at least if both write!
                
> EntityManager.merge does not work for entity that is managed by another EntityManager
> -------------------------------------------------------------------------------------
>
>                 Key: OPENJPA-2405
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-2405
>             Project: OpenJPA
>          Issue Type: Bug
>    Affects Versions: 2.2.3
>            Reporter: Arne Limburg
>         Attachments: OPENJPA-2405.patch
>
>
> EntityManager.merge does not work for entity that is managed by another EntityManager.
Instead of updating that entity OpenJPA tries to persist the entity a second time

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