Error channel for Spring Cloud Stream Service-Bus Binder

Question

I'm trying to configure an error channel for Spring Cloud Azure Service Bus Queue Stream Binder with no success. I've enabled the error channel via

spring:
  cloud:
    stream:
      function:
        definition: produce
      bindings:
        produce-out-0:
          destination: service-bus-q-a
          producer:
            error-channel-enabled: true

And tried defining a @ServiceActivator :

@ServiceActivator(inputChannel = "service-bus-q-a.errors")
public void errors(ErrorMessage receiveMsg) {
    System.err.println("receive error msg: " + receiveMsg);
}

I've also tried on inputChannel = "errorChannel" and inputChannel = "service-bus-qa.$Default.errors" . Obviously I am missing something here but I couldn't find a working example.

EDIT: I'm using the following Supplier bean:

@Bean
Supplier<String> produce() {
    return () -> {
        String msg = "a message to produce";
        LOG.info("Producing message: " + msg);
        return msg;
    };
}

According to the binding naming conventions , the name of the binding will be produce-out-0 . I can see that the message is indeed sent to service-bus-qa (I have a consumer on the other side).

EDIT AND SOLUTION:

So it appears I had a problem with my environment, and after rebuilding it everything worked as expected and as Garry Russell's answer shows . Sorry for the time wasted. For posterity, this is exactly what worked for me:

When declaring a binding

spring:
  cloud:
    stream:
      bindings:
        produce-out-0:
          destination: service-bus-q-a
          producer:
            error-channel-enabled: true

The error channel that will be created will be named {destination}.errors , in this case service-bus-qa.errors . In addition you have the global error channel errorChannel that will also be called if an error occurs. So you can use either

@ServiceActivator(inputChannel = "service-bus-q-a.errors")
public void errors(ErrorMessage receiveMsg) {
    System.err.println("receive error msg: " + receiveMsg);
}

To receive the errors from service-bus-qa or

@ServiceActivator(inputChannel = "errorChannel")
public void errors(ErrorMessage receiveMsg) {
    System.err.println("receive error msg: " + receiveMsg);
}

To receive the error from the global error channel.

Answer 1

I just tested it with this yaml and the property is true as expected.

spring:
  cloud:
    stream:
      bindings:
        output:
          producer:
            error-channel-enabled: true
    azure:
      servicebus:
        connectionString: Endpoint=sb://foo.bar

Are you sure your producer name ( produce-out-0 ) is correct?