Request Reply Issue - Advise needed

Hi,
Can someone please advise if I am setting the reply message correctly for the request reply process?

I want to send the message in the form of the StreamMessage.

StreamMessage streamMsg = JCSMPFactory.onlyInstance().createMessage(StreamMessage.class);

// Set the message delivery mode.
streamMsg.setDeliveryMode(DeliveryMode.DIRECT);

SDTStream stream = JCSMPFactory.onlyInstance().createStream();
stream.writeInteger(500);

streamMsg.setStream(stream);

ex.getOut().setBody(streamMsg);

Thanks
Ganesh