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POMy program will not stop after run() method in main thread finishes
 

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  1. POMy program will not stop after run() method in main thread finishes
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    <p>I am using Java. The main thread sends data, while a worker thread listens to responses. I also have Timer in case timeout occurs. In main(), I am calling run(), which can finish, according to the output. Here is what it looks like:</p> <pre><code>class Send { Worker w; run() { // w was initialized in constructor w.start(); .... w.join(); } main(args) { Send s = new Send(); s.run(); } private class Worker extend Thread { public void run() { .... } } } </code></pre> <p>In s.run(), every time I need to cancel the Timer or restart the Timer, I would do </p> <pre><code>timer.cancel(); timer.purge(); timer = new Timer(); timer.schdule(...); </code></pre> <p>The TimerTask is simply calling a static method in Send to handle the timeout. So what did I do wrong to cause my program hanging after the main thread finishes? Thank you. </p> <hr> <p>EDIT: the out put of <code>kill -3 process-id</code>:</p> <pre><code>Full thread dump OpenJDK 64-Bit Server VM (19.0-b09 mixed mode): "DestroyJavaVM" prio=10 tid=0x00007f9f20035000 nid=0x73f1 waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE "Timer-10" prio=10 tid=0x0000000001a7d800 nid=0x740f in Object.wait() [0x00007f9f1e39c000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on &lt;0x000000075833fe78&gt; (a java.util.TaskQueue) at java.lang.Object.wait(Object.java:502) at java.util.TimerThread.mainLoop(Timer.java:505) - locked &lt;0x000000075833fe78&gt; (a java.util.TaskQueue) at java.util.TimerThread.run(Timer.java:484) "Low Memory Detector" daemon prio=10 tid=0x00007f9f20004800 nid=0x7402 runnable [0x0000000000000000] java.lang.Thread.State: RUNNABLE "CompilerThread1" daemon prio=10 tid=0x0000000001a70000 nid=0x7401 waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE "CompilerThread0" daemon prio=10 tid=0x00007f9f20001000 nid=0x7400 waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE "Signal Dispatcher" daemon prio=10 tid=0x0000000001a6e800 nid=0x73ff waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE "Finalizer" daemon prio=10 tid=0x0000000001a49000 nid=0x73fe in Object.wait() [0x00007f9f1f3f2000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on &lt;0x00000007580b1310&gt; (a java.lang.ref.ReferenceQueue$Lock) at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:133) - locked &lt;0x00000007580b1310&gt; (a java.lang.ref.ReferenceQueue$Lock) at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:149) at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:177) "Reference Handler" daemon prio=10 tid=0x0000000001a47000 nid=0x73fd in Object.wait() [0x00007f9f1f4f3000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on &lt;0x00000007580b11e8&gt; (a java.lang.ref.Reference$Lock) at java.lang.Object.wait(Object.java:502) at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:133) - locked &lt;0x00000007580b11e8&gt; (a java.lang.ref.Reference$Lock) "VM Thread" prio=10 tid=0x0000000001a40000 nid=0x73fc runnable "GC task thread#0 (ParallelGC)" prio=10 tid=0x00000000019d7000 nid=0x73f2 runnable "GC task thread#1 (ParallelGC)" prio=10 tid=0x00000000019d9000 nid=0x73f3 runnable "GC task thread#2 (ParallelGC)" prio=10 tid=0x00000000019da800 nid=0x73f4 runnable "GC task thread#3 (ParallelGC)" prio=10 tid=0x00000000019dc800 nid=0x73f5 runnable "GC task thread#4 (ParallelGC)" prio=10 tid=0x00000000019de800 nid=0x73f6 runnable "GC task thread#5 (ParallelGC)" prio=10 tid=0x00000000019e0000 nid=0x73f7 runnable "GC task thread#6 (ParallelGC)" prio=10 tid=0x00000000019e2000 nid=0x73f8 runnable "GC task thread#7 (ParallelGC)" prio=10 tid=0x00000000019e4000 nid=0x73f9 runnable "GC task thread#8 (ParallelGC)" prio=10 tid=0x00000000019e5800 nid=0x73fa runnable "GC task thread#9 (ParallelGC)" prio=10 tid=0x00000000019e7800 nid=0x73fb runnable "VM Periodic Task Thread" prio=10 tid=0x00007f9f20007800 nid=0x7403 waiting on condition JNI global references: 886 Heap PSYoungGen total 150528K, used 7745K [0x00000007580b0000, 0x00000007628a0000, 0x0000000800000000) eden space 129088K, 6% used [0x00000007580b0000,0x00000007588405b8,0x000000075fec0000) from space 21440K, 0% used [0x00000007613b0000,0x00000007613b0000,0x00000007628a0000) to space 21440K, 0% used [0x000000075fec0000,0x000000075fec0000,0x00000007613b0000) PSOldGen total 343936K, used 0K [0x0000000608200000, 0x000000061d1e0000, 0x00000007580b0000) object space 343936K, 0% used [0x0000000608200000,0x0000000608200000,0x000000061d1e0000) PSPermGen total 21248K, used 3130K [0x00000005fdc00000, 0x00000005ff0c0000, 0x0000000608200000) object space 21248K, 14% used [0x00000005fdc00000,0x00000005fdf0ea30,0x00000005ff0c0000) </code></pre>
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    1. COis your worker's run() method logically ending?
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    2. COYou have to create a non-daemon thread and run it to have the application running. If you have only daemon threads, the process exits.
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    3. COLooks like you have a Timer thread still running - Timer-10 thread is in WAIT state. You are probably not invoking cancel() on one of your Timer objects.
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