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https://issues.apache.org/jira/browse/OPENJPA-1933?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12989246#comment-12989246
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Mark Struberg commented on OPENJPA-1933:
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This might be a regression of OPENJPA-1571 ?
> @ElementCollection loose proxytype after serialisation
> ------------------------------------------------------
>
> Key: OPENJPA-1933
> URL: https://issues.apache.org/jira/browse/OPENJPA-1933
> Project: OpenJPA
> Issue Type: Bug
> Components: kernel
> Affects Versions: 2.0.0, 2.0.1
> Reporter: Mark Struberg
> Priority: Critical
> Fix For: 2.2.0
>
>
> usually an @ElementCollection field loaded from the database will be created
> as a org.apache.openjpa.java$.util$.ArrayListProxy.
> After serialisation/deserialisation (with DetachedStateField=true) the List
> will be recreated as standard java.util.ArrayList.
> This has the bad side effect, that any subsequent add to this
> ElementCollection will not set the _dirty field in the DetachedStateManager
> and any changes in the ElementCollection will not get saved to the database.
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