[HTTPCORE-409] NIO HttpServer Does Not Shutdown Listener ExecutorService

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 4.4.3
• Fix Version/s: 4.4.4, 5.0-alpha1
• Component/s: HttpCore NIO
• Assignee: Unassigned
• Reporter: Hiranya Kasub Jayathilaka
• Created: 25/Sep/15 19:07
• Updated: 28/Sep/15 08:12
• Resolved: 28/Sep/15 08:12

Description

org.apache.http.impl.nio.bootstrap.HttpServer does not shutdown its listenerExecutorService. This causes the following thread to stay alive even after calling shutdown on HttpServer:

"HTTP-listener-8080-1" #11 prio=5 os_prio=31 tid=0x00007fc934887000 nid=0x6c03 waiting on condition [0x0000000120c8d000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)

• parking to wait for <0x000000076c0697e0> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
  at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
  at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
  at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
  at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1067)
  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127)
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
  at java.lang.Thread.run(Thread.java:745)

As a result the applications that use this HttpServer do not exit gracefully.

Note: The blocking HttpServer does shutdown this ExecutorService, and hence the problem only occurs in the NIO HttpServer.