I will seek to provide some guidance on the subject of setting message header properties in JMS.

Firstly, you need to enable writing the MQMD by setting the following constant on the destination object to true:

 WMQ_MQMD_WRITE_ENABLED

This is explained and documented at the below URL:

https://www.ibm.com/support/knowledgecenter/en/SSFKSJ_8.0.0/com.ibm.mq.dev.doc/q032330_.htm

You should be able to do this right on the MQQueue object as it inherits from the MQDestination class.

Secondly, depending on what properties you want to set, you will need to use the proper context option. This is explained at the below URL.

https://www.ibm.com/support/knowledgecenter/en/SSFKSJ_8.0.0/com.ibm.mq.dev.doc/q032350_.htm

As stated at the above link:

the following properties require WMQ_MQMD_MESSAGE_CONTEXT to be set to WMQ_MDCTX_SET_ALL_CONTEXT :

 JMS_IBM_MQMD_PutApplType
 JMS_IBM_MQMD_PutApplName
 JMS_IBM_MQMD_PutDate
 JMS_IBM_MQMD_PutTime
 JMS_IBM_MQMD_ApplOriginData

For example:

   myQ.setBooleanProperty(WMQConstants.WMQ_MQMD_WRITE_ENABLED, true);

   myQ.setIntProperty(WMQConstants.WMQ_MQMD_MESSAGE_CONTEXT,
     WMQConstants.WMQ_MDCTX_SET_ALL_CONTEXT);