带有Spring Boot的ActiveMQ。 邮件持久性不起作用

Question

I want to use ActiveMQ within Spring Boot app as embedded server. To setup ActiveMQ I used following tutorial: Spring Boot. Messaging with JMS. My app will be the broker and the consumer. There are multiple threads creating messages like this:

@Autowired
private JmsTemplate jmsTemplate;
.......
MessageCreator messageCreator = session -> session.createObjectMessage(transactionNotificationData);
                        jmsTemplate.setSessionAcknowledgeMode(Session.CLIENT_ACKNOWLEDGE);
                        jmsTemplate.send(QUEUE, messageCreator);

I have another class with following method:

@JmsListener(destination = QUEUE)
public void receive(Message message) throws IOException {
    brokerService.getPersistenceAdapter();
    try {
        if (message instanceof ObjectMessage) {
            ObjectMessage objMessage = (ObjectMessage) message;
            NotificationData notification = (NotificationData) objMessage.getObject();
            LOG.info("Received <" + notification.notification + ">");
            ...... do some stuff ........
//            message.acknowledge();
        }
    } catch (JMSException e) {
        e.printStackTrace();
    }

During the tests I can see the messages are produced and consumed. As you can see message.acknowledge() is commented. So I expect the message will be redelivered after rerun of my app. However it doesn't happen.

Answer 1

Message Acknowledgement is automatically handled by the container and it executes after the onMessage() is successfully executed,(receive() in your case),

so even when you comment message.acknowledge(); , container on its own sends the acknowledgement

you can have a look at following link for more reference

• Acknowledgement from Consumer in ActiveMQ

Hope this helps!

Good luck!