title: Default value of user id in MQ message header
body: <p>In my application, I am sending message out to a Websphere MQ queue. Here in the application, users have the flexibility to set the user id in the message. However my problem is, since the parameter is configurable in my application, if users does not set it, from where the value will be taken? </p>
  
  <p>I have gone through the below links, but got little idea about what value will be set for user id if it is not set at application level.</p>
  
  <ol>
  <li><p><a href="http://www-01.ibm.com/support/knowledgecenter/SSFKSJ_7.0.1/com.ibm.mq.csqzaw.doc/jm41030_.htm" rel="nofollow noreferrer">http://www-01.ibm.com/support/knowledgecenter/SSFKSJ_7.0.1/com.ibm.mq.csqzaw.doc/jm41030_.htm</a></p></li>
  <li><p><a href="https://stackoverflow.com/questions/540764/how-to-set-mqmd-applicationid-field-via-jms-api">How to set MQMD ApplicationID field via JMS API?</a></p></li>
  </ol>
  
  <p>Any help is appreciated.</p>