We are currently on Pega 8.4 and upgrading to Pega Infinity 23.1.4. As part of the upgrade, we are converting all our JMS MDB listeners to JMS listeners. Since Pega Infinity 23.1.4 is WAR based deployement instead of EAR based, we are converting from JMS MDB to JMS listeners. 

Earlier, when we were using JMS MDB listeners, if there are any errors processing the incoming messages by JMS MDB listeners, the messages will be automatically moved to BKO (Back out) queue. 

However, we observed that in JMS listener setup, if there are any errors processing the incoming messages by JMS listener, the messages are not moving to BKO (Back out) queue and the messages are getting vanished from original queue. 

Please let us know how we can configure to move the messages to back out queue in case of error processing the messages.