[Solved] Identify the error in this Spring Boot async method: @Async public void process() { CompletableFuture result = CompletableFuture.supplyAsync(() -> { throw new RuntimeException("Fail"); }); System.out.... | Spring Boot

Spring Boot - Async Processing

Identify the error in this Spring Boot async method:

@Async
public void process() {
    CompletableFuture result = CompletableFuture.supplyAsync(() -> {
        throw new RuntimeException("Fail");
    });
    System.out.println(result.get());
}

ACalling <code>result.get()</code> blocks the async thread, defeating async benefits.

BThrowing RuntimeException inside supplyAsync is not allowed.

CThe method must return CompletableFuture<String>, not void.

DMissing @EnableAsync annotation on the class.

Step-by-Step Solution

Solution:

Step 1: Analyze use of result.get()
Calling get() waits for the CompletableFuture to finish, blocking the async thread.
Step 2: Understand async best practices
Blocking defeats async purpose; exceptions inside supplyAsync are allowed and handled asynchronously.
Final Answer:
Calling result.get() blocks the async thread, defeating async benefits. -> Option A
Quick Check:
Blocking call inside async method = C [OK]

Quick Trick: Avoid blocking calls like get() inside async methods [OK]

Common Mistakes:

Thinking exceptions inside supplyAsync are disallowed
Believing async methods must always return CompletableFuture
Forgetting to enable async globally (not always required)

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More Spring Boot Quizzes

Identify the error in this Spring Boot async method:

Step 1: Analyze use of result.get()

Step 2: Understand async best practices

Final Answer:

Quick Check:

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