Handling java.util.concurrent.ExecutionException When Using CompletableFuture in Java 11
I need help solving I'm getting frustrated with I'm trying to use `CompletableFuture` to execute asynchronous tasks in my Java 11 application, but I'm working with an `ExecutionException` when I attempt to retrieve the result of a completed future. My code looks something like this: ```java import java.util.concurrent.CompletableFuture; import java.util.concurrent.ExecutionException; public class Example { public static void main(String[] args) { CompletableFuture<Integer> future = CompletableFuture.supplyAsync(() -> { // Simulate some work if (Math.random() > 0.5) { throw new RuntimeException("Random failure"); } return 42; }); try { Integer result = future.get(); // This line throws ExecutionException System.out.println("Result: " + result); } catch (InterruptedException | ExecutionException e) { System.err.println("behavior: " + e.getMessage()); if (e.getCause() != null) { System.err.println("Caused by: " + e.getCause().getMessage()); } } } } ``` When I call `future.get()`, I get an `ExecutionException` with the message that it was caused by a `RuntimeException`. I expected this exception to provide details about the failure that occurred within the `supplyAsync` method, but it seems like I'm not handling it correctly. I've tried using `future.exceptionally()` to handle exceptions but that only prevents the `ExecutionException` when getting the result. However, I still want to log the exception details when it happens. Here’s how I attempted to handle exceptions: ```java future.exceptionally(ex -> { System.out.println("Failed with exception: " + ex.getMessage()); return null; // or some default value }); ``` While this does log the exception, it still doesn't prevent the `ExecutionException` from being thrown when I call `future.get()`. Is there a more effective way to handle this situation or any recommended best practices to avoid such issues when using `CompletableFuture`? Any insights on proper exception handling in this context would be greatly appreciated! Cheers for any assistance! This is my first time working with Java LTS. Am I missing something obvious?