Error when populating cache with data.

Hi,
I am new to Oracle coherence. I was just following the examples at the following link:
http://download.oracle.com/docs/cd/E15357_01/coh.360/e15831/toc.htm
I am stuck at the following chapter:
5.2 Populating a Cache with Domain Objects
I am able to run the DataGenerator.java successfully. The contacts.csv file gets created.
When i run the LoaderExample.java, i get the following output:
Work: NE
77596
Yoyodyne Propulsion Systems, Grover's Mill US
330 Lectroid Rd.
Telephone Numbers
work: +11 927 20 4526527
home: +11 633 82 6834859
Birth Date: 1964-01-03
Exception in thread "main" (Wrapped) java.io.NotSerializableException: com.oracle.handson.ContactId
     at com.tangosol.util.ExternalizableHelper.toBinary(ExternalizableHelper.java:215)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.PartitionedService$ConverterKeyToBinary.convert(PartitionedService.CDB:29)
     at com.tangosol.util.ConverterCollections$AbstractConverterEntry.getKey(ConverterCollections.java:3387)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.PartitionedService.splitEntriesByOwner(PartitionedService.CDB:17)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.partitionedService.PartitionedCache$BinaryMap.ensureRequestTarget(PartitionedCache.CDB:18)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.partitionedService.PartitionedCache$BinaryMap.putAll(PartitionedCache.CDB:34)
     at com.tangosol.util.ConverterCollections$ConverterMap.putAll(ConverterCollections.java:1607)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.partitionedService.PartitionedCache$ViewMap.putAll(PartitionedCache.CDB:1)
     at com.tangosol.coherence.component.util.SafeNamedCache.putAll(SafeNamedCache.CDB:1)
     at com.oracle.handson.LoaderExample.load(LoaderExample.java:105)
     at com.oracle.handson.LoaderExample.main(LoaderExample.java:37)
Caused by: java.io.NotSerializableException: com.oracle.handson.ContactId
     at java.io.ObjectOutputStream.writeObject0(Unknown Source)
     at java.io.ObjectOutputStream.writeObject(Unknown Source)
     at com.tangosol.util.ExternalizableHelper.writeSerializable(ExternalizableHelper.java:2216)
     at com.tangosol.util.ExternalizableHelper.writeObjectInternal(ExternalizableHelper.java:2664)
     at com.tangosol.util.ExternalizableHelper.serializeInternal(ExternalizableHelper.java:2564)
     at com.tangosol.util.ExternalizableHelper.toBinary(ExternalizableHelper.java:211)
     ... 10 more
2010-11-15 16:20:04.741/4.812 Oracle Coherence GE 3.6.0.0 <D4> (thread=ShutdownHook, member=4): ShutdownHook: stopping cluster node
2010-11-15 16:20:04.772/4.843 Oracle Coherence GE 3.6.0.0 <D5> (thread=DistributedCache, member=4): Service DistributedCache left the cluster
Can anyone please help me as to why i am getting this error?
I am unable to move forward to the next example due to this error.
Any ideas would be of great help.
Thanks

Can you post the code for the ContactId class? I suspect you have forgotten to implement one of the PortableObject, Serializable, Externalizable, or ExternalizableLite interfaces. If that isn't it are you telling Coherence to use POF?
-Dtangosol.pof.enabled=true -Dtangosol.pof.config=pof-config.xmlEdited by: Willy Myers on 15-Nov-2010 04:02

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