Java 11 CompletableFuture: Handling Multiple Asynchronous Tasks with Custom handling Handling
I'm updating my dependencies and I've looked through the documentation and I'm still confused about I'm working on a project and hit a roadblock... I'm working on a personal project and I'm using Java 11 and trying to execute multiple asynchronous tasks using `CompletableFuture`... I've set up my tasks to run in parallel, but I'm running into issues with exception handling that seems to be causing my application to hang. Specifically, I'm using the `allOf` method to wait for all of the futures to complete, but when one of the tasks fails, I don't know how to capture that exception without terminating the entire process. Here's a simplified version of my code: ```java import java.util.concurrent.CompletableFuture; public class AsyncExample { public static void main(String[] args) { CompletableFuture<Void> future1 = CompletableFuture.supplyAsync(() -> { // Simulating task if (Math.random() > 0.5) throw new RuntimeException("Task 1 failed"); return "Task 1 completed"; }).exceptionally(ex -> { System.out.println(ex.getMessage()); return null; }); CompletableFuture<Void> future2 = CompletableFuture.supplyAsync(() -> { return "Task 2 completed"; }); CompletableFuture<Void> allOf = CompletableFuture.allOf(future1, future2); allOf.join(); // This hangs if future1 fails System.out.println("All tasks completed"); } } ``` When `future1` throws an exception, the `join()` method seems to block indefinitely. I've tried using `handle` instead of `exceptionally`, but that doesn't seem to solve the question. What is the best practice for handling exceptions in this scenario? I want to ensure that even if one future fails, I can still capture the result of the others and prevent the application from hanging. This is part of a larger web app I'm building. Any help would be greatly appreciated! For context: I'm using Java on Ubuntu. How would you solve this? Could this be a known issue? What's the best practice here?