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Groups > comp.lang.java.programmer > #29886

Re: refusal to quit

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On Fri, 29 Aug 2014 09:56:45 -0700, Roedy Green
<see_website@mindprod.com.invalid> wrote, quoted or indirectly quoted
someone who said :

>Sometimes programs simply refuse to quit after main has terminated. 

I sprinkled a call to this code in every main.

    /**
     * call just before System.exit( 0 ) to find out if there was more
than one thread.
     */
    public static void trackLastThread()
        {
        final int activeCount = Thread.activeCount();
        if ( activeCount == 1 )
            {
            return;
            }
        else
            {
            out.println( activeCount + " threads " );
            }
        final Thread[] ta = new Thread[ activeCount ];
        Thread.enumerate( ta );
        for ( Thread t : ta )
            {
            out.println( "T H R E A D" );
            out.println( t.toString() );
            final StackTraceElement[] s = t.getStackTrace();
            for ( StackTraceElement e : s )
                {
                out.println( e.toString() );
                }
            out.println();
            }
        }  // /method

In one case it said that a Timer was still running.  I thought
Timer.cancel would be sufficient to kill it, but apparently not.
I gather it just stops the periodic calls to run, but leaves the
thread alive.

-- 
Roedy Green Canadian Mind Products http://mindprod.com
Errors using inadequate data are much less than those using no data at all. 
~ Charles Babbage (born: 1791-12-26 died: 1871-10-18 at age: 79)

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refusal to quit Roedy Green <see_website@mindprod.com.invalid> - 2014-08-29 09:56 -0700
  Re: refusal to quit Mike Amling <mamling@chaff.us> - 2014-08-29 12:50 -0500
    Re: refusal to quit Roedy Green <see_website@mindprod.com.invalid> - 2014-08-31 11:31 -0700
      Re: refusal to quit Josip Almasi <joe@vrspace.org> - 2014-09-01 17:14 +0200
        Re: refusal to quit Roedy Green <see_website@mindprod.com.invalid> - 2014-09-01 16:37 -0700
  Re: refusal to quit Josip Almasi <joe@vrspace.org> - 2014-08-29 22:16 +0200
    Re: refusal to quit Roedy Green <see_website@mindprod.com.invalid> - 2014-08-31 11:32 -0700
      Re: refusal to quit Josip Almasi <joe@vrspace.org> - 2014-09-01 17:20 +0200
  Re: refusal to quit Knute Johnson <eternal@knutejohnson.com> - 2014-08-29 17:25 -0700
  Re: refusal to quit Roedy Green <see_website@mindprod.com.invalid> - 2014-09-01 14:20 -0700
    Re: refusal to quit Roedy Green <see_website@mindprod.com.invalid> - 2014-09-01 14:34 -0700
    Re: refusal to quit Josip Almasi <joe@vrspace.org> - 2014-09-02 10:49 +0200
    Re: refusal to quit Arne Vajhøj <arne@vajhoej.dk> - 2014-09-07 22:04 -0400
  Re: refusal to quit Jan Burse <janburse@fastmail.fm> - 2014-09-02 12:17 +0200

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