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https://issues.apache.org/jira/browse/OPENJPA-1722?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12888845#action_12888845
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Dianne Richards commented on OPENJPA-1722:
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Hi Mike - I'm trying to figure one out, if it's possible.

> Problem serializing DistinctResultList when EntityManager is closed
> -------------------------------------------------------------------
>
>                 Key: OPENJPA-1722
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-1722
>             Project: OpenJPA
>          Issue Type: Bug
>          Components: kernel
>    Affects Versions: 2.1.0
>            Reporter: Dianne Richards
>            Assignee: Dianne Richards
>             Fix For: 2.1.0
>
>
> A client application that worked earlier is now failing in 2.10, relating to 
> the serialization of the DistinctResultList. It does a distinct query 
> followed by a getResultList(). A DistinctResultList is returned from the 
> query, where a DelegatingResultList used to be returned. The EntityManager is 
> closed before the serialization occurs. It fails with the exception: 
> org.apache.openjpa.persistence.InvalidStateException: The context has been 
> closed.
> Here's what is happening: The DistinctResultList contains a 
> RuntimeExceptionTranslator object which contains the closed EntityManager. 
> The writeObject() in the enclosed BrokerImpl does an assertOpen(), which 
> issues the exception.
> The DelegatingResultList also contains the RuntimeExceptionTranslator. But, 
> it contains a writeResult() method which is called during serialization. This 
> only attempts to write the ResultList object, not the 
> RuntimeExceptionTranslator object.
> So, I will add the writeResult() method to the DistinctResultList class. In 
> this case, it will write an ArrayList instead of a ResultList object. This 
> should be ok since the method signature is for a List.

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