[Solved] What happens if you publish an event but no listener is registered for that event type? — Ans: The event is ignored silently without errors. | Spring Boot

Spring Boot - Advanced Patterns

What happens if you publish an event but no listener is registered for that event type?

AThe application logs an error and stops.

BThe application throws a runtime exception.

CThe event is queued until a listener registers.

DThe event is ignored silently without errors.

Step-by-Step Solution

Solution:

Step 1: Understand event publishing behavior
Spring allows publishing events even if no listener exists; it does not throw errors.
Step 2: Confirm no error or queueing
Events are simply ignored if no listener is present; no queuing or stopping occurs.
Final Answer:
The event is ignored silently without errors. -> Option D
Quick Check:
No listener means silent ignore [OK]

Quick Trick: No listener means event ignored silently [OK]

Common Mistakes:

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What happens if you publish an event but no listener is registered for that event type?