# ScheduledThreadPoolExecutor not shutting down completely **URL:** \ **Category:** Elasticsearch\ **Created:** [January 19, 2016, 7:09am UTC](https://discuss.elastic.co/t/scheduledthreadpoolexecutor-not-shutting-down-completely/39504 "2016-01-19T07:09:13Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![ArivazhaganJ](https://avatars.discourse-cdn.com/v4/letter/a/c67d28/32.png) [@ArivazhaganJ](https://discuss.elastic.co/u/ArivazhaganJ)\ **Post date:** [January 19, 2016, 7:09am UTC](https://discuss.elastic.co/t/scheduledthreadpoolexecutor-not-shutting-down-completely/39504/1 "2016-01-19T07:09:14Z")
I am using Elasticsearch 1.5.1 with Java application. I have been monitoring the application with plumbr tool. Whenever JVM stop/redeploy is done, plumbr warns about Perm Gen memory leak issue. Log indicates that , Your application leaks classloaders because the application has not shut down the java.util.concurrent.ScheduledThreadPoolExecutor thread pool before the redeploy. This thread pool has 1 tasks in queue waiting to be executed and 1 threads currently running. pool-11-thread-1 See below to find out, what are threads from this pool doing right now. 1 threads run: sun.misc.Unsafe.park(Native Method) java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:226) java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2082) java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1090) java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:807) java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1043) java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1103) java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) java.lang.Thread.run(Thread.java:722). Can some one help if we can shutdown this ScheduledThreadPoolExecutor completely when JVM stops. ---
**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\ **Post date:** [January 19, 2016, 7:10am UTC](https://discuss.elastic.co/t/scheduledthreadpoolexecutor-not-shutting-down-completely/39504/2 "2016-01-19T07:10:19Z")
Please keep it to the one thread - [[Solved] Classloader Leak in Elasticsearch-ScheduledThreadPoolExecutor not cleared](https://discuss.elastic.co/t/classloader-leak-in-elasticsearch/39454) ---
**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\ **Post date:** [January 19, 2016, 7:10am UTC](https://discuss.elastic.co/t/scheduledthreadpoolexecutor-not-shutting-down-completely/39504/3 "2016-01-19T07:10:22Z")