Hi Devs,
I recently migrated an application from http-core to http-core-nio. When I try
to gracefully shutdown my server, I noticed that it does not terminate cleanly.
It seems to hang. A thread dump taken during this state revealed that the
following thread is not getting killed:
"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)
A close look at the source of HttpServer revealed that the
listenerExecutorService used by this class is never shut down. Incidentally,
the classic blocking implementation of HttpServer does call shutdown on the
listenerExecutorService, and therefore the problem only occurs in the nio
version of the library.
Is this a bug, or am I missing something? I'm using http-core-nio 4.4.3.
Thanks,
Hiranya
--
Hiranya Jayathilaka
Mayhem Lab/RACE Lab;
Dept. of Computer Science, UCSB; http://cs.ucsb.edu
E-mail: [email protected]; Mobile: +1 (805) 895-7443
Blog: http://techfeast-hiranya.blogspot.com
