JMS API with client acknowledgement issue

[Андрей]

Hi Team,

I am currently using "artemis-jakarta-client" 2.31.2 version

I've stumbled into an issue with client acknowledge mode when using JMS
API. Here's an example:


        try (var factory = new ActiveMQConnectionFactory("<broker-url")) {
            try (var ctx = factory.createContext("<user>", "<password>",
JMSContext.CLIENT_ACKNOWLEDGE)) {
                var destination = ctx.createQueue("<destination>");
                try (var consumer = ctx.createConsumer(destination)) {
                    var message1 = consumer.receive(100000); // suppose
this call returns real message
                    var message2 = consumer.receive(100000); // suppose
this call times out, so NULL is returned
                    ctx.acknowledge(); // I'm expecting that message1 gets
acknowledged here, but it's not happening

                    /*
                    Do something here....
                     */

                }
            }
        }

The reason for ack not working is that the implementation of
"consumer.receive" method stores the latest returned value in JMSContext
for future usage in its "acknowledge" method.
This happens regardless if the value is null or not. So in case latest call
returns null, all the previous messages get lost and never acked.

This seem like a defect. Am I right?

Thanks in advance