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From "Michael Dick (JIRA)" <j...@apache.org>
Subject [jira] Work started: (OPENJPA-1912) enhancer generates invalid code if fetch-groups is activated
Date Wed, 16 Feb 2011 00:18:58 GMT

     [ https://issues.apache.org/jira/browse/OPENJPA-1912?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Work on OPENJPA-1912 started by Michael Dick.

> 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
>            Assignee: Michael Dick
>            Priority: Critical
>         Attachments: OPENJPA-1912-enhancer.patch, OPENJPA-1912-fix-wo_cleanup-2.patch,
OPENJPA-1912-fix-wo_cleanup.patch, OPENJPA-1912-mdd.diff.txt, OPENJPA-1912-test.patch
>
>
> 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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