[Solved] Consider this Spring Boot async method:@Async public CompletableFuture fetchResult() { return CompletableFuture.completedFuture("Success"); }What does the caller receive when invoking fetchResult()? | Spring Boot

Spring Boot - Async Processing

Consider this Spring Boot async method:

@Async
public CompletableFuture fetchResult() {
  return CompletableFuture.completedFuture("Success");
}

What does the caller receive when invoking fetchResult()?

AA CompletableFuture immediately completed with "Success"

BThe string "Success" directly

CA null value because the method is async

DAn exception because async methods cannot return values

Step-by-Step Solution

Solution:

Step 1: Understand return type of async method
The method returns a CompletableFuture<String> which is completed immediately.
Step 2: Caller behavior
The caller receives the CompletableFuture object, not the raw string.
Final Answer:
A CompletableFuture immediately completed with "Success" -> Option A
Quick Check:
Async methods returning CompletableFuture return the future, not direct value [OK]

Quick Trick: Async method returns CompletableFuture, not direct result [OK]

Common Mistakes:

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