Is it possible to use the JMS explicit client acknowledgment mechanism with the grails JmsService whereby the application calls an acknowledge method on the received JMS ? So far we’re receiving messages already converted into the application specific class and therefore aren’t getting the raw JMS messsage on which to call acknowledge. A colleague looking into this wrote “I found receiveSelected method that returns raw Message in org.springframework.jms.core.JmsTemplate class. Do you think replacing the grails to spring JmsTemplate class is an option, or would that be too risky and time-consuming change?” Any pointers to best grails app practice for using client acknowledge would be very helpful . Thanks