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Date: Thu, 2 Dec 2010 15:32:10 -0500 (EST)
From: "Mark Struberg (JIRA)" <jira@apache.org>
To: dev@openjpa.apache.org
Subject: [jira] Commented: (OPENJPA-1900) ClassCastException when
 serializing an entity if DetachedStateField=true
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    [ https://issues.apache.org/jira/browse/OPENJPA-1900?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12966269#action_12966269 ] 

Mark Struberg commented on OPENJPA-1900:
----------------------------------------

The Externalizable field gets added if I use the openjpa.DetachStage fetch-groups(DetachStateField=true)

This is an issues in our test suite currently - it uses different persistence.xml for enhancing (${project.build.testOutputDirectory}/META-INF/nopriv_persistence.xml) and running the tests (org/apache/openjpa/persistence/proxy/persistence1.xml)

Thus my test currently succeeds but only because this isn't a real world scenario.

PS: took me a while to figure this, but at least I'm now pretty deep into OpenJPA internals :D

> ClassCastException when serializing an entity if DetachedStateField=true
> ------------------------------------------------------------------------
>
>                 Key: OPENJPA-1900
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-1900
>             Project: OpenJPA
>          Issue Type: Bug
>          Components: kernel
>    Affects Versions: 2.0.1, 2.1.0
>            Reporter: Mark Struberg
>             Fix For: 2.1.0
>
>         Attachments: OPENJPA-1900-test-1.patch
>
>
> When using 
> <property name="openjpa.DetachState" value="fetch-groups(DetachedStateField=true)"/>
> serializing an entity leads to the following Exception:
> java.lang.ClassCastException: org.apache.openjpa.kernel.StateManagerImpl cannot be cast to org.apache.openjpa.kernel.DetachedStateManager
> 	at org.apache.openjpa.util.Proxies.writeReplace(Proxies.java:147)
> 	at org.apache.openjpa.util.java$util$Date$proxy.writeReplace(Unknown Source)
> 	at sun.reflect.GeneratedMethodAccessor176.invoke(Unknown Source)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> 	at java.lang.reflect.Method.invoke(Method.java:597)
> 	at java.io.ObjectStreamClass.invokeWriteReplace(ObjectStreamClass.java:1032)
> 	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1107)
> 	at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:326)
> 	at org.apache.openjpa.kernel.SingleFieldManager.serialize(SingleFieldManager.java:545)
> 	at org.apache.openjpa.kernel.StateManagerImpl.writeDetached(StateManagerImpl.java:1478)
> 	at at.ac.tuwien.tiss.curriculum.be.entities.CurriculumVersion.writeExternal(CurriculumVersion.java)
> 	at java.io.ObjectOutputStream.writeExternalData(ObjectOutputStream.java:1421)
> This seems related to OPENJPA-1597

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