Dear all,
I searched on Google but cannot find any similar topics. I am a Akka newbie
and used Akka to start some workers to process time consuming tasks.
I used system.AwaitTermination() and system.shutdown() to shutdown Akka.
My Akka used RoundRobinRouter and schedules 10 workers.
But, the JVM does not exit. Then I print all running threads.
Map<Thread, StackTraceElement[]> threads = Thread.getAllStackTraces();
for(Thread t:threads.keySet()){
System.out.println("--------------------------------------------------------");
System.out.println(t.getId()+":"+t.getName()+" is
daemon:"+t.isDaemon());
for(StackTraceElement stackTrace: threads.get(t)){
System.out.println(stackTrace.getFileName());
System.out.println(stackTrace.getClassName());
System.out.println(stackTrace.getMethodName());
System.out.println(stackTrace.isNativeMethod());
}
System.out.println("--------------------------------------------------------");
}
The following is the output.
Can anyone give me any hint whether is Akka prevent the JVM from exiting
and if it is, how to prevent that?
Thanks!
George
--------------------------------------------------------
2:Reference Handler is daemon:true
Object.java
java.lang.Object
wait
true
Object.java
java.lang.Object
wait
false
Reference.java
java.lang.ref.Reference$ReferenceHandler
run
false
--------------------------------------------------------
--------------------------------------------------------
27:CreationSystem-akka.actor.default-dispatcher-6 is daemon:false
Unsafe.java
sun.misc.Unsafe
park
true
ForkJoinPool.java
scala.concurrent.forkjoin.ForkJoinPool
idleAwaitWork
false
ForkJoinPool.java
scala.concurrent.forkjoin.ForkJoinPool
scan
false
ForkJoinPool.java
scala.concurrent.forkjoin.ForkJoinPool
runWorker
false
ForkJoinWorkerThread.java
scala.concurrent.forkjoin.ForkJoinWorkerThread
run
false
--------------------------------------------------------
--------------------------------------------------------
20:pool-3-thread-1 is daemon:false
Unsafe.java
sun.misc.Unsafe
park
true
LockSupport.java
java.util.concurrent.locks.LockSupport
park
false
AbstractQueuedSynchronizer.java
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject
await
false
ScheduledThreadPoolExecutor.java
java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue
take
false
ScheduledThreadPoolExecutor.java
java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue
take
false
ThreadPoolExecutor.java
java.util.concurrent.ThreadPoolExecutor
getTask
false
ThreadPoolExecutor.java
java.util.concurrent.ThreadPoolExecutor
runWorker
false
ThreadPoolExecutor.java
java.util.concurrent.ThreadPoolExecutor$Worker
run
false
Thread.java
java.lang.Thread
run
false
--------------------------------------------------------
--------------------------------------------------------
18:CreationSystem-akka.actor.default-dispatcher-4 is daemon:false
Unsafe.java
sun.misc.Unsafe
park
true
ForkJoinPool.java
scala.concurrent.forkjoin.ForkJoinPool
scan
false
ForkJoinPool.java
scala.concurrent.forkjoin.ForkJoinPool
runWorker
false
ForkJoinWorkerThread.java
scala.concurrent.forkjoin.ForkJoinWorkerThread
run
false
--------------------------------------------------------
--------------------------------------------------------
12:C3P0PooledConnectionPoolManager[identityToken->1hge24797149gw291ezhx58|6badc6a5]-HelperThread-#0
is daemon:true
Object.java
java.lang.Object
wait
true
ThreadPoolAsynchronousRunner.java
com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread
run
false
--------------------------------------------------------
--------------------------------------------------------
22:pool-3-thread-3 is daemon:false
Unsafe.java
sun.misc.Unsafe
park
true
LockSupport.java
java.util.concurrent.locks.LockSupport
park
false
AbstractQueuedSynchronizer.java
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject
await
false
ScheduledThreadPoolExecutor.java
java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue
take
false
ScheduledThreadPoolExecutor.java
java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue
take
false
ThreadPoolExecutor.java
java.util.concurrent.ThreadPoolExecutor
getTask
false
ThreadPoolExecutor.java
java.util.concurrent.ThreadPoolExecutor
runWorker
false
ThreadPoolExecutor.java
java.util.concurrent.ThreadPoolExecutor$Worker
run
false
Thread.java
java.lang.Thread
run
false
--------------------------------------------------------
--------------------------------------------------------
28:Keep-Alive-Timer is daemon:true
Thread.java
java.lang.Thread
sleep
true
KeepAliveCache.java
sun.net.www.http.KeepAliveCache
run
false
Thread.java
java.lang.Thread
run
false
--------------------------------------------------------
--------------------------------------------------------
4:Signal Dispatcher is daemon:true
--------------------------------------------------------
--------------------------------------------------------
29:CreationSystem-akka.actor.default-dispatcher-7 is daemon:false
Unsafe.java
sun.misc.Unsafe
park
true
ForkJoinPool.java
scala.concurrent.forkjoin.ForkJoinPool
scan
false
ForkJoinPool.java
scala.concurrent.forkjoin.ForkJoinPool
runWorker
false
ForkJoinWorkerThread.java
scala.concurrent.forkjoin.ForkJoinWorkerThread
run
false
--------------------------------------------------------
--------------------------------------------------------
1:main is daemon:false
Thread.java
java.lang.Thread
dumpThreads
true
Thread.java
java.lang.Thread
getAllStackTraces
false
TestAkka.java
com.toucha.platform.common.akka.TestAkka
main
false
--------------------------------------------------------
--------------------------------------------------------
19:pool-2-thread-1 is daemon:false
Unsafe.java
sun.misc.Unsafe
park
true
LockSupport.java
java.util.concurrent.locks.LockSupport
parkNanos
false
AbstractQueuedSynchronizer.java
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject
awaitNanos
false
ScheduledThreadPoolExecutor.java
java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue
take
false
ScheduledThreadPoolExecutor.java
java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue
take
false
ThreadPoolExecutor.java
java.util.concurrent.ThreadPoolExecutor
getTask
false
ThreadPoolExecutor.java
java.util.concurrent.ThreadPoolExecutor
runWorker
false
ThreadPoolExecutor.java
java.util.concurrent.ThreadPoolExecutor$Worker
run
false
Thread.java
java.lang.Thread
run
false
--------------------------------------------------------
--------------------------------------------------------
24:pool-3-thread-5 is daemon:false
Unsafe.java
sun.misc.Unsafe
park
true
LockSupport.java
java.util.concurrent.locks.LockSupport
park
false
AbstractQueuedSynchronizer.java
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject
await
false
ScheduledThreadPoolExecutor.java
java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue
take
false
ScheduledThreadPoolExecutor.java
java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue
take
false
ThreadPoolExecutor.java
java.util.concurrent.ThreadPoolExecutor
getTask
false
ThreadPoolExecutor.java
java.util.concurrent.ThreadPoolExecutor
runWorker
false
ThreadPoolExecutor.java
java.util.concurrent.ThreadPoolExecutor$Worker
run
false
Thread.java
java.lang.Thread
run
false
--------------------------------------------------------
--------------------------------------------------------
16:CreationSystem-akka.actor.default-dispatcher-2 is daemon:false
Unsafe.java
sun.misc.Unsafe
park
true
ForkJoinPool.java
scala.concurrent.forkjoin.ForkJoinPool
scan
false
ForkJoinPool.java
scala.concurrent.forkjoin.ForkJoinPool
runWorker
false
ForkJoinWorkerThread.java
scala.concurrent.forkjoin.ForkJoinWorkerThread
run
false
--------------------------------------------------------
--------------------------------------------------------
21:pool-3-thread-2 is daemon:false
Unsafe.java
sun.misc.Unsafe
park
true
LockSupport.java
java.util.concurrent.locks.LockSupport
park
false
AbstractQueuedSynchronizer.java
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject
await
false
ScheduledThreadPoolExecutor.java
java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue
take
false
ScheduledThreadPoolExecutor.java
java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue
take
false
ThreadPoolExecutor.java
java.util.concurrent.ThreadPoolExecutor
getTask
false
ThreadPoolExecutor.java
java.util.concurrent.ThreadPoolExecutor
runWorker
false
ThreadPoolExecutor.java
java.util.concurrent.ThreadPoolExecutor$Worker
run
false
Thread.java
java.lang.Thread
run
false
--------------------------------------------------------
--------------------------------------------------------
11:C3P0PooledConnectionPoolManager[identityToken->1hge24797149gw291ezhx58|6badc6a5]-AdminTaskTimer
is daemon:true
Object.java
java.lang.Object
wait
true
Timer.java
java.util.TimerThread
mainLoop
false
Timer.java
java.util.TimerThread
run
false
--------------------------------------------------------
--------------------------------------------------------
3:Finalizer is daemon:true
Object.java
java.lang.Object
wait
true
ReferenceQueue.java
java.lang.ref.ReferenceQueue
remove
false
ReferenceQueue.java
java.lang.ref.ReferenceQueue
remove
false
Finalizer.java
java.lang.ref.Finalizer$FinalizerThread
run
false
--------------------------------------------------------
--------------------------------------------------------
14:C3P0PooledConnectionPoolManager[identityToken->1hge24797149gw291ezhx58|6badc6a5]-HelperThread-#2
is daemon:true
Object.java
java.lang.Object
wait
true
ThreadPoolAsynchronousRunner.java
com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread
run
false
--------------------------------------------------------
--------------------------------------------------------
23:pool-3-thread-4 is daemon:false
Unsafe.java
sun.misc.Unsafe
park
true
LockSupport.java
java.util.concurrent.locks.LockSupport
parkNanos
false
AbstractQueuedSynchronizer.java
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject
awaitNanos
false
ScheduledThreadPoolExecutor.java
java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue
take
false
ScheduledThreadPoolExecutor.java
java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue
take
false
ThreadPoolExecutor.java
java.util.concurrent.ThreadPoolExecutor
getTask
false
ThreadPoolExecutor.java
java.util.concurrent.ThreadPoolExecutor
runWorker
false
ThreadPoolExecutor.java
java.util.concurrent.ThreadPoolExecutor$Worker
run
false
Thread.java
java.lang.Thread
run
false
--------------------------------------------------------
--------------------------------------------------------
13:C3P0PooledConnectionPoolManager[identityToken->1hge24797149gw291ezhx58|6badc6a5]-HelperThread-#1
is daemon:true
Object.java
java.lang.Object
wait
true
ThreadPoolAsynchronousRunner.java
com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread
run
false
--------------------------------------------------------
--------------------------------------------------------
25:pool-3-thread-6 is daemon:false
Unsafe.java
sun.misc.Unsafe
park
true
LockSupport.java
java.util.concurrent.locks.LockSupport
parkNanos
false
AbstractQueuedSynchronizer.java
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject
awaitNanos
false
ScheduledThreadPoolExecutor.java
java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue
take
false
ScheduledThreadPoolExecutor.java
java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue
take
false
ThreadPoolExecutor.java
java.util.concurrent.ThreadPoolExecutor
getTask
false
ThreadPoolExecutor.java
java.util.concurrent.ThreadPoolExecutor
runWorker
false
ThreadPoolExecutor.java
java.util.concurrent.ThreadPoolExecutor$Worker
run
false
Thread.java
java.lang.Thread
run
false
--------------------------------------------------------
--------------------------------------------------------
26:CreationSystem-akka.actor.default-dispatcher-5 is daemon:false
Unsafe.java
sun.misc.Unsafe
compareAndSwapLong
true
ForkJoinPool.java
scala.concurrent.forkjoin.ForkJoinPool
tryTerminate
false
ForkJoinPool.java
scala.concurrent.forkjoin.ForkJoinPool
idleAwaitWork
false
ForkJoinPool.java
scala.concurrent.forkjoin.ForkJoinPool
scan
false
ForkJoinPool.java
scala.concurrent.forkjoin.ForkJoinPool
runWorker
false
ForkJoinWorkerThread.java
scala.concurrent.forkjoin.ForkJoinWorkerThread
run
false
--------------------------------------------------------
--------------------------------------------------------
5:Attach Listener is daemon:true
--------------------------------------------------------
--------------------------------------------------------
17:CreationSystem-akka.actor.default-dispatcher-3 is daemon:false
Unsafe.java
sun.misc.Unsafe
park
true
ForkJoinPool.java
scala.concurrent.forkjoin.ForkJoinPool
scan
false
ForkJoinPool.java
scala.concurrent.forkjoin.ForkJoinPool
runWorker
false
ForkJoinWorkerThread.java
scala.concurrent.forkjoin.ForkJoinWorkerThread
run
false
--------------------------------------------------------
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