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From: Jeff Higgins <jeff@invalid.invalid>
Newsgroups: comp.lang.java.programmer
Subject: Re: javax.swing.Timer blocking program termination
Date: Tue, 14 Jul 2015 20:31:56 -0400
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Defined in AbstractQueuedSynchronizer:
/**
  * The number of nanoseconds for which it is faster to spin
  * rather than to use timed park. A rough estimate suffices
  * to improve responsiveness with very short timeouts.
  */
static final long spinForTimeoutThreshold = 1000L;



 From the method:
AbstractQueuedSynchronizer.awaitNanos

if (nanosTimeout >= spinForTimeoutThreshold)
   LockSupport.parkNanos(this, nanosTimeout);



 From thread dump after close:
Timer ringing: javax.swing.Timer@b52ebbf
Timer ringing: javax.swing.Timer@7a50dc07
Close
"TimerQueue"
    java.lang.Thread.State: TIMED_WAITING
         at sun.misc.Unsafe.park(Native Method)
         at 
java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
         at 
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
         at java.util.concurrent.DelayQueue.take(DelayQueue.java:223)
         at javax.swing.TimerQueue.run(TimerQueue.java:171)
         at java.lang.Thread.run(Thread.java:745)