[FIXED] Spring Cloud Stream + RabbitMQ - Consuming existing messages in queue

Issue

I have a RabbitMQ message broker running in a server, to which I'm trying to configure a Producer and a Consumer using Spring Cloud Stream. My Producer is creating messages in a queue every second, while my Consumer reads them at the same rate. However, if I stop my Consumer and the Producer keeps pushing messages, when I restart my Consumer again it is unable to retrieve the messages created in that period of time it was down, only picking up the messages produced from the time that it was started. How can I make my Consumer consume existing messages in the queue when it starts?

Here are my Consumer properties:

cloud:
    stream:
      bindings:
        input:
          destination: spring-cloud-stream-demo
          consumer:
            auto-bind-dlq: true
            republishToDlq: true
            maxAttempts: 5

And my Producer properties:

cloud:
    stream:
      bindings:
        output:
          destination: spring-cloud-stream-demo

Appreciate any help!

Solution

You need to add a group to the consumer (input) binding; otherwise it will bind an anonymous, auto-delete, queue to the exchange.

With a group, a permanent, durable, queue is bound instead.

Answered By - Gary Russell
Answer Checked By - Mary Flores (JavaFixing Volunteer)