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https://issues.apache.org/jira/browse/OPENJPA-1912?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12985642#action_12985642
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Mark Struberg commented on OPENJPA-1912:
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It seems this has nothing to do with fetch-groups, but will always be generated
if DetachedStateField=true gets used.
My configuration currently: <property name="openjpa.DetachState"
value="loaded(DetachedStateField=true)"/>
> enhancer generates invalid code if fetch-groups is activated
> ------------------------------------------------------------
>
> Key: OPENJPA-1912
> URL: https://issues.apache.org/jira/browse/OPENJPA-1912
> Project: OpenJPA
> Issue Type: Bug
> Components: Enhance
> Affects Versions: 2.0.0, 2.0.1, 2.1.0
> Reporter: Mark Struberg
> Priority: Critical
>
> If openjpa.DetachState =fetch-groups is used, the enhancer will add a
> 'implements Externalizable' + writeExternal + readExternal.
> The problem is, that writeExternal and readExternal will also try to
> externalize the private members of any given superclass. Thus we get a
> runtime Exception that we are not allowed to access those fields.
> Example:
> @Entity
> public abstract class AbstractGroup {
> ...
> @Temporal(TemporalType.TIMESTAMP)
> @TrackChanges
> private Date applicationBegin;
> ...
> }
> and
> @Entity
> public class Group extends AbstractGroup {
> ...
> }
> will result in the following code (decompiled with jad):
> public void writeExternal(ObjectOutput objectoutput)
> throws IOException
> {
> pcWriteUnmanaged(objectoutput);
> if(pcStateManager != null)
> {
> if(pcStateManager.writeDetached(objectoutput))
> return;
> } else
> {
> objectoutput.writeObject(pcGetDetachedState());
> objectoutput.writeObject(null);
> }
> objectoutput.writeObject(applicationBegin);
> objectoutput.writeObject(applicationEnd);
> objectoutput.writeObject(applicationLocked);
> objectoutput.writeObject(approvalRequired);
> ...
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