Handling Concurrent Modifications in Java Collections with ExecutorService
I've been struggling with this for a few days now and could really use some help... I've looked through the documentation and I'm still confused about After trying multiple solutions online, I still can't figure this out. I'm facing a problem with concurrent modifications in a shared `ArrayList` when using `ExecutorService`. I have multiple threads adding elements to the list, but I'm encountering a `ConcurrentModificationException`. I'm running Java 11 and using the following code: ```java import java.util.ArrayList; import java.util.List; import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; public class ConcurrentModificationExample { private static final List<String> sharedList = new ArrayList<>(); public static void main(String[] args) { ExecutorService executorService = Executors.newFixedThreadPool(5); for (int i = 0; i < 10; i++) { final int index = i; executorService.submit(() -> { sharedList.add("Element " + index); System.out.println("Added: Element " + index); }); } executorService.shutdown(); } } ``` When I run this code, I get the exception: ``` Exception in thread "pool-1-thread-1" java.util.ConcurrentModificationException ``` I've read that using a `CopyOnWriteArrayList` could be a solution, but I'm unsure how to implement that in my scenario. Here's what I tried: ```java import java.util.concurrent.CopyOnWriteArrayList; private static final List<String> sharedList = new CopyOnWriteArrayList<>(); ``` However, I am concerned about the performance implications of using `CopyOnWriteArrayList`, especially when there will be frequent writes. Should I go ahead with this approach, or is there a better alternative? Any insights on best practices for handling concurrent modifications in Java collections would be greatly appreciated! For context: I'm using Java on Windows. Any help would be greatly appreciated! This is part of a larger microservice I'm building. How would you solve this? How would you solve this?