The version of jboss-serialization used in the current releases has a bug where jboss serialization doesn't seem to work. It seems to have been broken sometime between 1.0.0RC1 and 1.0.3GA

Here's the stacktrace

at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassCastException: org.jboss.serial.objectmetamodel.DataContainer$DataContainerDirectOutput
at org.jboss.aop.util.MarshalledValue.writeExternal(MarshalledValue.java:190)
at org.jboss.serial.persister.ExternalizePersister.writeData(ExternalizePersister.java:58)
at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.describeObject(ObjectDescriptorFactory.java:276)
at org.jboss.serial.objectmetamodel.DataContainer$DataContainerDirectOutput.writeObject(DataContainer.java:206)
at org.jboss.aop.metadata.SimpleMetaData.writeExternal(SimpleMetaData.java:226)
at org.jboss.serial.persister.ExternalizePersister.writeData(ExternalizePersister.java:58)
at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.describeObject(ObjectDescriptorFactory.java:276)
at org.jboss.serial.objectmetamodel.DataContainer$DataContainerDirectOutput.writeObject(DataContainer.java:206)
at org.jboss.aop.joinpoint.MethodInvocation.writeExternal(MethodInvocation.java:321)
at org.jboss.serial.persister.ExternalizePersister.writeData(ExternalizePersister.java:58)
at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.describeObject(ObjectDescriptorFactory.java:276)
at org.jboss.serial.objectmetamodel.DataContainer$DataContainerDirectOutput.writeObject(DataContainer.java:206)
at org.jboss.serial.persister.RegularObjectPersister.writeSlotWithFields(RegularObjectPersister.java:182)
at org.jboss.serial.persister.RegularObjectPersister.defaultWrite(RegularObjectPersister.java:90)
at org.jboss.serial.persister.RegularObjectPersister.writeData(RegularObjectPersister.java:62)
at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.describeObject(ObjectDescriptorFactory.java:276)
at org.jboss.serial.objectmetamodel.DataContainer$DataContainerDirectOutput.writeObject(DataContainer.java:206)
at org.jboss.serial.io.JBossObjectOutputStream.writeObjectOverride(JBossObjectOutputStream.java:181)
at java.io.ObjectOutputStream.writeObject(Unknown Source)
at org.jboss.remoting.serialization.impl.jboss.JBossSerializationManager.sendObject(JBossSerializationManager.java:89)
at org.jboss.remoting.marshal.serializable.SerializableMarshaller.write(SerializableMarshaller.java:120)
at org.jboss.remoting.marshal.compress.CompressingMarshaller.write(CompressingMarshaller.java:105)
at org.jboss.remoting.transport.http.HTTPClientInvoker.useHttpURLConnection(HTTPClientInvoker.java:278)
at org.jboss.remoting.transport.http.HTTPClientInvoker.transport(HTTPClientInvoker.java:136)
at org.jboss.remoting.MicroRemoteClientInvoker.invoke(MicroRemoteClientInvoker.java:122)
at org.jboss.remoting.Client.invoke(Client.java:1634)
at org.jboss.remoting.Client.invoke(Client.java:548)