MQQueue get call fails to get the message from queue - ibm-mq

Question

MQQueue get call fails to retrieve the message from the queue with 2033 (07F1) (RC2033): MQRC_NO_MSG_AVAILABLE error. I am using the following code to get the message from the queue:
GET message:
byte[] replyMessageBytes = null;
try {
this.replyConnection.open();
MQQueue replyQueue = this.replyConnection.getQueue(CMQC.MQOO_INPUT_AS_Q_DEF);
if (null == replyQueue) {
logger.error("Could not create reply queue.");
throw new PFMCommunicationException("Could not create reply queue.");
}
MQMessage replyMessage = new MQMessage();
MQGetMessageOptions gmo = new MQGetMessageOptions();
gmo.resolvedQueueName = replyQueue.getResolvedQName();
if (timeout.length > 0) {
try {
gmo.waitInterval = Integer.valueOf("" + timeout[0]);
} catch (NumberFormatException e) {
}
} else {
gmo.waitInterval = MQConstants.MQWI_UNLIMITED;
}
gmo.options = MQConstants.MQGMO_WAIT;
if (null != correlationId) {
gmo.matchOptions = MQConstants.MQMO_MATCH_MSG_ID | MQConstants.MQMO_MATCH_CORREL_ID;
replyMessage.messageId = correlationId.getBytes();
replyMessage.correlationId = correlationId.getBytes();
} else {
gmo.matchOptions = MQConstants.MQMO_NONE;
replyMessage.messageId = MQConstants.MQMI_NONE;
replyMessage.correlationId = MQConstants.MQCI_NONE;
}
try {
replyQueue.get(replyMessage, gmo);
int length = replyMessage.getMessageLength();
replyMessageBytes = replyMessage.readStringOfByteLength(length).getBytes();
} catch (MQException e) {
logger.error("ERROR on receiving reply: CC=" + e.completionCode + " RC=" + e.reasonCode + " "
+ e.getMessage());
} catch (IOException e) {
logger.error("ERROR on receiving reply.", e);
}
if (null == replyMessageBytes) {
logger.error("No reply received.");
} else {
logger.debug("Received message: " + new String(replyMessageBytes));
}
} catch (MQException e) {
logger.error("ERROR:", e);
throw new PFMCommunicationException(e);
} catch (PFMConnectionException e) {
logger.error(e.getMessage());
throw new PFMCommunicationException(e);
} finally {
this.replyConnection.close();
logger.debug("Closed connection with MQ replies.");
}
I confirm that the message is present in the queue before the waitInterval expires and the correlationId also matches. In-fact, when I run the code without trying to match the correlationId, I am able to get the message. I guess this means either something is wrong with the response message or I am making a mistake creating the matchOptions properly.
gmo.matchOptions = MQConstants.MQMO_NONE;
replyMessage.messageId = MQConstants.MQMI_NONE;
replyMessage.correlationId = MQConstants.MQCI_NONE;
This is what my response message header looks like:
<Header Origin="DISPUTE1" Addressee="PSXDX2" Date="20180802" Time="123055" Area="QUERY" Content="RAddr" ID="8af3257cf01a4842bf5eec8d" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="cms/customerAccountDetails.xsd">
I tried with putting CorrelId instead of ID in the response header but it's still the same. Can someone please help me to find the issue?

Answer 1

if (null != correlationId) {
gmo.matchOptions = MQConstants.MQMO_MATCH_MSG_ID | MQConstants.MQMO_MATCH_CORREL_ID;
replyMessage.messageId = correlationId.getBytes();
replyMessage.correlationId = correlationId.getBytes();
}
Well, that's your problem. It would be extremely rare, if ever, that an MQ message would have the same value in BOTH the MsgId and CorrelId fields.
If you are getting a reply message for a request that you sent, and you saved the request message's MsgId after the MQPUT, then the code should be:
if (null != correlationId) {
gmo.matchOptions = MQConstants.MQMO_MATCH_CORREL_ID;
replyMessage.correlationId = correlationId.getBytes();
}
Note: You don't save the request (outbound) message's CorrelId but rather the MsgId. The server processing your request, should put the incoming MsgId in the reply message's CorrelId. Hence, that is why you ONLY match on CorrelId for the reply message.