Executor and Daemon in Java

Check out the JavaDoc for newSingleThreadScheduledExecutor(ThreadFactory threadFactory)

It would be implemented something like this:

public class MyClass {     private DaemonThreadFactory dtf = new DaemonThreadFactory();    private ScheduledExecutorService executor =                                  Executors.newSingleThreadScheduledExecutor(dtf);    // ....class stuff.....    // ....Instance the runnable.....    // ....submit() to executor....}class DaemonThreadFactory implements ThreadFactory {    public Thread newThread(Runnable r) {        Thread thread = new Thread(r);        thread.setDaemon(true);        return thread;    }}

If you're using a scheduled executor, you can provide a ThreadFactory. This is used to create new Threads, and you can modify these (e.g. make them daemon) as you require.

EDIT: To answer your update, your ThreadFactory just needs to implement newThread(Runnable r) since your WebRunnable is a Runnable. So no real extra work.

Just to complement with another possible solution for completeness. It may not be as nice though.

final Executor executor = Executors.newSingleThreadExecutor();Runtime.getRuntime().addShutdownHook(new Thread() {    @Override    public void run() {        executor.shutdownNow();    }});