[Solved] Consider this async method in Spring Boot:@Async public CompletableFuture getData() { if(true) throw new IllegalStateException("Failure");... }What will the caller receive when invoking getData()? | Spring Boot

Spring Boot - Async Processing

Consider this async method in Spring Boot:

@Async
public CompletableFuture getData() {
  if(true) throw new IllegalStateException("Failure");
  return CompletableFuture.completedFuture("Success");
}

What will the caller receive when invoking getData()?

AA <code>CompletableFuture</code> that completes exceptionally with <code>IllegalStateException</code>.

BA null value immediately due to the exception.

CA completed <code>CompletableFuture</code> with the string "Success".

DThe exception is caught and logged internally, returning an empty future.

Step-by-Step Solution

Solution:

Step 1: Exception thrown before CompletableFuture creation
The method throws an exception before returning any CompletableFuture.
Step 2: Spring async behavior
Spring wraps the thrown exception inside a CompletableFuture that completes exceptionally.
Final Answer:
The caller receives a CompletableFuture that completes exceptionally with IllegalStateException. -> Option A
Quick Check:
Exceptions thrown in async methods returning CompletableFuture complete the future exceptionally [OK]

Quick Trick: Exceptions in CompletableFuture async methods complete future exceptionally [OK]

Common Mistakes:

Expecting null or immediate exception instead of exceptional future.
Assuming the method returns a successful future despite the exception.
Believing exceptions are logged internally without affecting the future.

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More Spring Boot Quizzes

Consider this async method in Spring Boot:

Step 1: Exception thrown before CompletableFuture creation

Step 2: Spring async behavior

Final Answer:

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