Sending a Message with Spring Cloud Stream and RabbitMq changes ID - spring

Question

I'm using Spring Cloud Stream and RabbitMq to exchange Messages between different microservices.
Thats my setup to publish a message.
public interface OutputChannels {
static final String OUTPUT_CHANNEL = "outputChannel";
#Output
MessageChannel outputChannel();
}
.
#EnableBinding(OutputChannels.class)
#Log4j
public class OutputProducer {
#Autowired
private OutputChannels outputChannels;
public void createMessage(MyContent myContent) {
Message<MyContent> message = MessageBuilder
.withPayload(myContent)
.build();
outputChannels.outputChannel().send(message);
log.info("Sent message: " + message.getHeaders().getId() + myContent);
}
}
And the setup to receive the message
public interface InputChannels {
String INPUT_CHANNEL = "inputChannel";
#Input
SubscribableChannel inputChannel();
}
.
#EnableBinding(InputChannels.class)
#Log
public class InputConsumer {
#StreamListener(InputChannels.INPUT_CHANNEL)
public void receive(Message<MyContent> message) {
MyContent myContent = message.getPayload();
log.info("Received message: " + message.getHeaders().getId() + ", " + myContent);
}
}
I am able to successfully exchange messages with this setup. I would expect, that the IDs of the sent message and the received message are equal. But they are always different UUIDs.
Is there a way that the message keeps the same ID all the way from the producer, through the RabbitMq, to the consumer?

Answer 1

Spring Messaging messages are immutable; they get a new ID each time they are mutated.
You can use a custom header or IntegrationMessageHeaderAccessor.CORRELATION_ID to convey a constant value; in most use cases, the correlation id header is set by the application to the ID header at the start of a message's journey.