HELP GURU NEEDED!!! JAXB NotSerializableException/NullPointerException

Hi,
This is one for the Gurus.
I have a JAXB implementation that unmarshalls an xml stream into a instance of type HIEAIXMLDOC.
The methods to create this are wrapped up in a session EJB and pass the unmarshaled HIEAIXMLDOC instance back to a client.
On the client side I want to call methods on the unmarshalled doc HIEAIXMLDOC to get my data.
The first problem I encountered was the NotSerializableException being thrown when I attempted to unmarshall my xml stream into the HIEAIXMLDOC class (on the server side).
I then implemented the Serializable interface on this class and rebuilt the JAXB classes that seemed to work and I was allowed to call the unmarshall method to unmarshall the xml stream and so create the HIEAIXMLDOC instance.
Now the what happens is that an object seems to be passed back to the calling client class but it contains no information and the NullPointerException is being thrown.
The funny thing I noticed was that on the server side (ie within my session ejb) I called the same methods that I called on the client side and they return valid data on the server side?????
So basically my HIEAIXMLDOC instance is working and valid on the server side but once it is passed to the client it looses all data within.
I'm a bit stumped on this one and have no gurus to talk to about this.
Any help is greatly appreciated.
thanks in advance
Paul

I can't comment on your sepcific problem but we have just had a similar issue with converting a JAXB set of code into an EJB. What you need to know for this is here:
http://java.sun.com/webservices/docs/1.2/jaxb/vendorCustomizations.html
If you use a binding file, just put the customisations in there (thats what we did).
(we didn't use the Uid= part of the serialise flag)
Hope this helps.

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