trouble getting the jmsMessageID

I am trying to retrieve the messageID after creating a TextMessage from the QueueSession.
The call to getJMSMessageID() on the resulting message returns null.

Any ideas?
Code example below:
           try {
                      System.out.println("QueueSession = " + qsess.toString());
                      message = qsess.createTextMessage();
                      msgId = message.getJMSMessageID();
                      System.out.println("msgID:= " + msgId);
                }

Debug output:
QueueSession = weblogic.jms.client.WLSessionImpl@afa68a
msgID:= null