[Solved] Given this Spring Boot RabbitMQ listener configuration, what happens when message processing throws an exception?... } Assuming mainQueue has a DLQ configured, what is the expected behavior? | Spring Boot

Spring Boot - Messaging

Given this Spring Boot RabbitMQ listener configuration, what happens when message processing throws an exception?

@RabbitListener(queues = "mainQueue")
public void listen(String msg) {
  if(msg.contains("fail")) throw new RuntimeException("Fail");
  System.out.println("Processed: " + msg);
}

Assuming mainQueue has a DLQ configured, what is the expected behavior?

AThe message is retried infinitely without moving to DLQ

BThe application crashes immediately

CThe message is lost without any logging

DThe failed message is sent to the Dead Letter Queue and processing continues

Step-by-Step Solution

Solution:

Step 1: Understand exception handling in RabbitMQ listener
When an exception occurs, the message is rejected and, if DLQ is configured, routed there.
Step 2: Confirm system behavior with DLQ
The failed message goes to the Dead Letter Queue, allowing the main queue to continue processing other messages.
Final Answer:
The failed message is sent to the Dead Letter Queue and processing continues -> Option D
Quick Check:
Exception triggers DLQ routing [OK]

Quick Trick: Exception sends message to DLQ if configured [OK]

Common Mistakes:

Assuming app crashes on exception
Thinking message is lost silently
Believing infinite retries without DLQ

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More Spring Boot Quizzes

Given this Spring Boot RabbitMQ listener configuration, what happens when message processing throws an exception?

Step 1: Understand exception handling in RabbitMQ listener

Step 2: Confirm system behavior with DLQ

Final Answer:

Quick Check:

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