Spring webapp - shutting down threads on Application stop

I am instantiating a ScheduledExecutorService using Spring's ApplicationListener interface as follows:

@Component
public class ExecutorsStart implements ApplicationListener<ContextRefreshedEvent> { private ScheduledExecutorService executor;@Autowired
Scheduler scheduler;@Override
public void onApplicationEvent(final ContextRefreshedEvent event) {
executor = Executors.newSingleThreadScheduledExecutor();
scheduler.init();
int delay = 10;
int period = 60;// repeat every 1 minutes.
executor.scheduleAtFixedRate(scheduler, delay, period, TimeUnit.SECONDS);
}

At the moment, Tomcat won't shut down cleanly when I run, ./shutdown.sh, with message:

The web application [/foo] appears to have started a thread named [pool-1-thread-1] but has failed to stop it

and this seems to be because I have not yet written code to stop the ScheduledExecutorService.

My question is: how should this be done properly in this environment?

I noticed that there exists a ContextStoppedEvent, so, I implemented a listener for it:

@Component
public class ExecutorsStop implements ApplicationListener<ContextStoppedEvent> {@Autowired
ExecutorsStart executorsStart;@Override
public void onApplicationEvent(final ContextStoppedEvent event) {
executorsStart.executor.shutdownNow();
}

But it seems that this event handler doesn't get called when Tomcat is shutdown.

Have I implemented this incorrectly, or am I going about this completely the wong way?