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https://issues.apache.org/jira/browse/OPENJPA-1933?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12998140#comment-12998140
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Michael Dick commented on OPENJPA-1933:
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I took a look through the documentation, here's my take.
If you have a persistence.xml file with version=2.0. The proxies will be
removed if DetachedStateManager=true and
(IgnoreDetachedStateFieldForProxySerialization=false or is unset). Otherwise
the proxies will not be removed.
If you have a persistence.xml file with version=1.0. The proxies should be
serialized if you call EntityManager.clear() prior to serializing. Otherwise
(e.g. if you call detach() or detachAll(), or find() ) the proxies will be
removed.
This seems to be the opposite of what you've found (but I haven't thoroughly
looked at the tests) - so you're right - we have a fish in our deserialization
logic.
This is a very confusing set of options and we should try to make it clearer in
a future release, but for now I think we've at least identified the issue.
> @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
>
> Attachments: OPENJPA-1933-test-2.patch, OPENJPA-1933-test.patch,
> openjpa-reg-tests.tar.gz
>
>
> 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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