B2B Integration

Im trying to put a message with some headers to a topic and get them using a java client. However, I am able to successfully put the message with headers, but unable to get the headers from the message. Here is the code I'm trying.

Put to Topic

MQMessage message = new MQMessage();
MQDLH mqdlh = new MQDLH();
mqdlh.setDestQName("DEV.QUEUE.1");
mqdlh.setIntValue("Reason", 10);

MQTM mqtm = new MQTM();
mqtm.setApplId("TestAppId");
mqtm.setProcessName("TestProcessName");

MQHeaderList headerList = new MQHeaderList();
headerList.add(mqdlh);
headerList.add(mqtm);
headerList.write(message);

MQPropertyDescriptor d = new MQPropertyDescriptor();
d.version = MQPD_USER_CONTEXT;
 message.writeString("Your message payload");
topic.put(message);

Get from Topic

MQMessage msg = new MQMessage();
MQGetMessageOptions gmo = new MQGetMessageOptions();
gmo.options = MQGMO_WAIT;
gmo.waitInterval = MQConstants.MQWI_UNLIMITED;
topic.get(msg, gmo);

MQHeaderIterator iterator = new MQHeaderIterator(msg);

while (iterator.hasNext()) {
          MQHeader header = iterator.nextHeader();
          System.out.println(header);
}

The iterator always returns an empty result here. However, if I try to read headers one by one as follows, I'm able to successfully get them.

MQDLH dlh = new MQDLH();
dlh.read(msg);
System.out.println(new String(dlh.getDestQName()));
System.out.println((dlh.getValue("Reason")));

I'm unable to understand the issue here and any help regarding this is much appreciated. Is there any configuration that I should give to make this work?