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Mark Struberg commented on OPENJPA-1900: ---------------------------------------- think I know the difference between the openjpa-persistence-jdbc and my projects config. I use the openjpa-maven-plugin for enhancing my project and I get the Externalizable interface generated into my enhanced classes. This doesn't happen with the Annuity entities. But the problem above only happens if StateManagerImpl#writeDetached get's invoked on an entity which is linked to multiple other entites... Question: why do I get the Externalizable interface in my entities? > 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 -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.