Stateful session, passivate serialization exception, ArrayLi

[riekhof]

I have a stateful session bean that maintains a List of Serializable helper classes. This List is implemented with an ArrayList. I get exceptions whenever JBoss (3.06) tries to passivate one of my stateful ejbs (see below). I think it is because one of classes that helps out with java.util.ArrayList is not serializable (RandomAccessSubList). Anyone else experienced this and found a workaround?

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08:52:52,062 ERROR [Log4jService$ThrowableListenerLoggingAdapter] unhandled throwable
javax.ejb.EJBException: Could not passivate; CausedByException is:
java.util.RandomAccessSubList
at org.jboss.ejb.plugins.StatefulSessionFilePersistenceManager.passivateSession(StatefulSessionFilePersistenceManager.java:294)
at org.jboss.ejb.plugins.StatefulSessionInstanceCache.passivate(StatefulSessionInstanceCache.java:78)
at org.jboss.ejb.plugins.AbstractInstanceCache$1.execute(AbstractInstanceCache.java:616)
at org.jboss.util.WorkerQueue$QueueLoop.run(WorkerQueue.java:206)
at java.lang.Thread.run(Thread.java:536)
java.io.NotSerializableException: java.util.RandomAccessSubList
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1054)
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1330)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1302)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1245)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1052)
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1330)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1302)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1245)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1052)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:278)
at org.jboss.ejb.plugins.StatefulSessionFilePersistenceManager.passivateSession(StatefulSessionFilePersistenceManager.java:288)
at org.jboss.ejb.plugins.StatefulSessionInstanceCache.passivate(StatefulSessionInstanceCache.java:78)
at org.jboss.ejb.plugins.AbstractInstanceCache$1.execute(AbstractInstanceCache.java:616)
at org.jboss.util.WorkerQueue$QueueLoop.run(WorkerQueue.java:206)
at java.lang.Thread.run(Thread.java:536)

[adrian.brock]

Looks like at somepoint you obtained a sublist
of the ArrayList which is does implement Serializable.

Regards,
Adrian

[riekhof]

Thanks, that was it. ArrayList's sublist() implementation returns a non-serialable List. I just wrapped it like this and my stacktraces went away.

new ArrayList( myArrayList.subList( i,j ) );


Darrel