Java 17: Issue with ScheduledExecutorService and Thread Interruption During Long-Running Tasks
I'm stuck on something that should probably be simple. I'm facing an issue with `ScheduledExecutorService` in Java 17 where my scheduled tasks are not responding to thread interruptions as expected. I have a task that runs every 10 seconds, but I need to be able to stop it gracefully when needed. The task is performing a long-running operation, and even after calling `shutdownNow()`, it doesn’t seem to stop immediately. Here’s a simplified version of my code: ```java import java.util.concurrent.*; public class SchedulerExample { private final ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1); private volatile boolean running = true; public void start() { scheduler.scheduleAtFixedRate(() -> { try { while (running) { System.out.println("Task is running..."); // Simulate long-running task Thread.sleep(10000); } } catch (InterruptedException e) { System.out.println("Task interrupted!"); Thread.currentThread().interrupt(); // Preserve interrupt status } }, 0, 10, TimeUnit.SECONDS); } public void stop() { running = false; scheduler.shutdownNow(); } public static void main(String[] args) throws InterruptedException { SchedulerExample example = new SchedulerExample(); example.start(); Thread.sleep(30000); // Let it run for a while example.stop(); } } ``` When I call `stop()`, I see the message from the `catch` block, but the task still doesn’t stop immediately; it waits for the 10 seconds of the `Thread.sleep(10000)`. How can I make it respond to interruptions faster? Should I be using a different approach to manage the long-running task? Is there a recommended pattern for handling interruptions in a scheduled task? Any advice would be appreciated! For context: I'm using Java on Ubuntu.