[Solved] What happens if a long-running task is executed synchronously in a Spring Boot REST controller? — Ans: The server thread waits and blocks other requests until the task finishes | Spring Boot

Spring Boot - Async Processing

What happens if a long-running task is executed synchronously in a Spring Boot REST controller?

AThe server automatically converts it to async processing

BThe task runs in the background without blocking the server thread

CThe task is ignored and not executed

DThe server thread waits and blocks other requests until the task finishes

Step-by-Step Solution

Solution:

Step 1: Understand synchronous task behavior
Synchronous means the server waits for the task to finish before continuing, blocking the thread.
Step 2: Match behavior to options
Only The server thread waits and blocks other requests until the task finishes correctly describes the blocking behavior of synchronous tasks.
Final Answer:
The server thread waits and blocks other requests until the task finishes -> Option D
Quick Check:
Synchronous task = Blocking server thread [OK]

Quick Trick: Sync tasks block server threads until done [OK]

Common Mistakes:

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What happens if a long-running task is executed synchronously in a Spring Boot REST controller?