[Solved] You added @Async to a method but it still runs synchronously. What is the most likely cause? — Ans: The method is private or called from within the same class | Spring Boot

Spring Boot - Async Processing

You added @Async to a method but it still runs synchronously. What is the most likely cause?

AThe @EnableAsync annotation is missing in the configuration

BThe method is private or called from within the same class

CThe method returns void instead of CompletableFuture

DThe application is running in debug mode

Step-by-Step Solution

Solution:

Step 1: Understand @Async proxy limitations
@Async works via proxies and does not intercept calls to private methods or self-calls within the same class.
Step 2: Identify cause from options
The method is private or called from within the same class correctly identifies that private or internal calls prevent async behavior.
Final Answer:
The method is private or called from within the same class -> Option B
Quick Check:
@Async fails on private/self calls [OK]

Quick Trick: Async won't work on private or self-called methods [OK]

Common Mistakes:

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You added @Async to a method but it still runs synchronously. What is the most likely cause?