Using Message Selector w/JMSCorrelationID causes auto-commit

Question

I'm using the following code to create a session with transactions enabled:
Session session = connection.createQueueSession(true, Session.AUTO_ACKNOWLEDGE);
String messageSelector = "JMSCorrelationID = 'myid'";
QueueReceiver receiver = session.createReceiver(ioQueue, messageSelector);
When I call receiver.receiveNoWait(), it retrieves the message, but automatically commits it. If I call session.rollback() directly afterward, I don't get any exceptions, but the message is completely removed from the queue (as if I had committed it).
If I use the same exact code with an empty message selector (""), the rollback works fine all the time.
Does anyone have any idea why? I'm using MQ v5.3 on W2k.
Thanks!
Jeff

Answer 1

use CLIENT_ACKNOWLEDGE
Session session = connection.createQueueSession(true, Session.CLIENT_ACKNOWLEDGE);
);//Session.AUTO_ACKNOWLEDGE);
from the spec:
CLIENT_ACKNOWLEDGE - With this option, a client acknowledges a
message by calling the message�s acknowledge method. Acknowledging a
consumed message automatically acknowledges the receipt of all messages
that have been delivered by its session.
AUTO_ACKNOWLEDGE - With this option, the session automatically
acknowledges a client�s receipt of a message when it has either successfully
returned from a call to receive or the MessageListener it has called to process
the message successfully returns.