It is a common problem. Read this thread:
http://groups.google.co.uk/group/google-appengine-java/browse_frm/thread/bce6630a3f01f23a/62cb1c4d38cc06c7?lnk=gst&q=com.google.gwt.user.client.rpc.SerializationException%3A+Type+%27org.datanucleus.store.appengine.query.StreamingQueryResult%27+was+not+included+in+the+set+of+types+which+can+be+serialized+by+this+SerializationPolicy
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