How it works...

Thanks to the standards implemented in the Jakarta EE 8 server, our MDB is 100% managed by the container. That's why we could just refer to the queue without looking back:

@MessageDriven(activationConfig = {
    @ActivationConfigProperty(propertyName = "destinationLookup", 
    propertyValue = "jms/JmsQueue"),
    @ActivationConfigProperty(propertyName = "destinationType", 
    propertyValue = "javax.jms.Queue")
})

We could have built a consumer with our own hands, but it would involve three times as many code lines and would be synchronous.

We get our container producer from a session provided by our factory and made for our queue:

        try (Connection connection = jmsFactory.createConnection(); 
             Session session = connection.createSession(false, 
             Session.AUTO_ACKNOWLEDGE)) {
            
            producer = session.createProducer(jmsQueue);
            ...
        }

Then, all we have to do is to create and send the message:

            message = session.createTextMessage();

            String msg = "Now it is " + new Date();
            message.setText(msg);
            System.out.println("Message sent to queue: " + msg);
            producer.send(message);