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Date: Fri, 28 Jun 2013 18:40:20 +0000 (UTC)
From: "Jody Grassel (JIRA)" <jira@apache.org>
To: dev@openjpa.apache.org
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Subject: [jira] [Commented] (OPENJPA-2405) EntityManager.merge does not work
 for entity that is managed by another EntityManager
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    [ https://issues.apache.org/jira/browse/OPENJPA-2405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13695651#comment-13695651 ] 

Jody Grassel commented on OPENJPA-2405:
---------------------------------------

Further Thoughts, as I realize the statement "A managed entity instance is an instance with a persistent identity that is currently associated with a persistence context." could be read differently than how I read it (using the 2.1 spec, which should not be different from previous spec iterations.)

3.2.8 Managed Instances
It is the responsibility of the application to insure that an instance is managed in only a single persistence context. The behavior is undefined if the same Java instance is made managed in more than one persistence context.

The contains() method can be used to determine whether an entity instance is managed in the current persistence context.

-- What I take from here is that from the perspective of a Persistence Context, an entity is managed if and only if it is actively associated with it.  So an Entity Object instance with a StateManager associated with PCtx#1 is a "managed entity" only from the perspective of PCtx#1 (emPCTX1.contains(entity) returns true).  Any other PCtxs, such as PCtx#2 would see that it has a StateManager that is not associated with it so it is neither "new" nor "managed" (by PCtx#2) and should consider it to be unmanaged (detached, since it cannot be a "new" entity for reasons previously stated) - in this case emPCTX2(entity) returns false.
                
> 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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