I've noticed that JMSHeaderReferencePolicyInterceptor and TransportServiceInterceptor set the JMSDeliveryMode and JMSPriority headers in the request and response JMS messages respectively before the messages are sent. I am under the impression that the JMS API requires these header values to be set via the MessageProducer interface. The values in the Message are ignored.
See Table 31-1 here: http://docs.sun.com/app/docs/doc/819-3669/bnceh?l=ja&a=view Greg
