Graceful shutdown of threads and executor

Question

The following piece of code tries to accompolish this.

The code loops forever and checks if there are any pending requests to be processed. If there is any, it creat

Answer 1

I had similar issue, i use to get error like

o.a.c.loader.WebappClassLoaderBase :: The web application [ROOT] appears to have started a thread named [pool-2-thread-1] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread: sun.misc.Unsafe.park(Native Method) java.util.concurrent.locks.LockSupport.park(LockSupport.java:175) java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)

Bellow code fixed it

private ThreadPoolExecutor executorPool;

@PostConstruct
public void init() {
    log.debug("Initializing ThreadPoolExecutor");
    executorPool = new ThreadPoolExecutor(1, 3, 1, TimeUnit.SECONDS, new ArrayBlockingQueue(1));
}

@PreDestroy
public void destroy() {
    log.debug("Shuting down ThreadPoolExecutor");
    executorPool.shutdown();
}