Websphere MQ message doesnot backout to Input Queue

Question

Have a message in Websphere MQ. Have read the message and I am trying to backout the message to Input Queue. Retry threshold not yet reached. Does the MQ message automatically put into Input Q when exception occurs? This is my code:

MQQueueManager qm = new MQQueueManager("");
MQQueue q = qm.accessQueue("");
MQMessage message = new MQMessage();
q.get(message);
System.out.println("Retry Count"+ message.backoutCount);
throw new NullPointerException;

Will the above code put the message to Input Queue again? In this case, it is not putting message back to Input Queue. Message is lost.

a_cornish_pasty a_cornish_pasty · Accepted Answer · 2016-01-18T21:38:10

Your message can only be backed out if it was part of a transaction to begin with. Your code doesn't use transactions.

Take a look at the MQGMO options, MQGMO_SYNCPOINT and MQGMO_SYNCPOINT_IF_PERSISTENT (search for the string MQGMO_SYNCPOINT in the below two links).

MQ Java Classes CMQC constants

MQ API description of MQGMO_SYNCPOINT - applicable to all languages

And also the commit() and backout() methods on the MQQueueManager:

MQQueueManager class

and suggest you read this general purpose explanation of transactions

Committing and backing out units of work

Websphere MQ message doesnot backout to Input Queue

1 Answers