You configured a Dead Letter Queue but messages are not arriving there after failures. Which of the following is the most likely cause?

medium📝 Debug Q14 of 15

Spring Boot - Messaging

AThe message payload is empty

BThe listener method does not throw exceptions

CThe main queue is missing the <code>x-dead-letter-exchange</code> argument

DThe DLQ name is too long

Step-by-Step Solution

Solution:

Step 1: Check DLQ configuration completeness
If the main queue lacks the x-dead-letter-exchange argument, failed messages have no route to DLQ.
Step 2: Evaluate other options
Listener throwing exceptions is needed but not sufficient; DLQ name length and empty payload do not prevent DLQ routing.
Final Answer:
The main queue is missing the x-dead-letter-exchange argument -> Option C
Quick Check:
Missing DLX argument blocks DLQ routing [OK]

Quick Trick: DLQ needs dead-letter-exchange set on main queue [OK]

Common Mistakes:

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