You have an async method returning CompletableFuture that may throw exceptions. How can you combine exception handling and fallback logic so the caller always gets a valid string without blocking?
hard📝 Application Q15 of 15
Spring Boot - Async Processing
You have an async method returning CompletableFuture that may throw exceptions. How can you combine exception handling and fallback logic so the caller always gets a valid string without blocking?
AUse <code>get()</code> on CompletableFuture and catch exceptions synchronously
BUse <code>handle</code> method on CompletableFuture to catch exceptions and provide fallback value
CWrap the async method call in a try-catch block in the caller thread
DDeclare the async method to throw checked exceptions and let caller handle them
Step-by-Step Solution
Solution:
Step 1: Understand async exception handling with CompletableFuture
The handle method allows processing both result and exception without blocking.
Step 2: Implement fallback logic in handle
Inside handle, check if exception is present and return fallback string if so.
Final Answer:
Use handle method on CompletableFuture to catch exceptions and provide fallback value -> Option B
Quick Check:
CompletableFuture.handle combines result and exception handling [OK]
Quick Trick:Use CompletableFuture.handle for async fallback without blocking [OK]
Common Mistakes:
Blocking caller thread with get() defeats async purpose
Trying to catch exceptions outside async context
Declaring checked exceptions in async methods unnecessarily
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