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From: Jeff Higgins <jeff@invalid.invalid>
Newsgroups: comp.lang.java.programmer
Subject: Re: javax.swing.Timer blocking program termination
Date: Mon, 13 Jul 2015 21:35:55 -0400
Organization: A noiseless patient Spider
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On 07/13/2015 08:46 PM, Knute Johnson wrote:
> On 7/13/2015 17:27, Jeff Higgins wrote:
>> On 07/13/2015 07:03 PM, Knute Johnson wrote:
>>> So I have this program that uses a couple of javax.swing.Timers.  I
>>> forgot to put in code to stop one of the timers yet the program would
>>> still terminate.  I have set the default close operation for the frame
>>> to be DISPOSE_ON_CLOSE.
>>>
>>> What I found was that a timer of less the 1000ms would prevent an
>>> application based on a JFrame from stopping but 1000ms or more and it
>>> would stop just fine.
>>>
>>> I know that javax.swing.Timer uses a common thread for all timers but I
>>> don't see anywhere that describes the stopping behavior.
>>>
>>> The program below will stop if the JFrame is closed and the timer is
>>> 1000ms or greater but hang if it is less.  I would be really curious to
>>> know if somebody else can duplicate this.
>>>
>>> import java.awt.*;
>>> import java.awt.event.*;
>>> import javax.swing.*;
>>>
>>> public class test extends JFrame {
>>>      public test() {
>>>          Timer timer = new Timer(1000,event -> {});
>>>          setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
>>>          setSize(400,300);
>>>          setVisible(true);
>>>          timer.start();
>>>      }
>>>
>>>      public static void main(String... args) {
>>>          EventQueue.invokeLater(() -> new test());
>>>      }
>>> }
>>>
>>
>>
>> import java.awt.EventQueue;
>> import javax.swing.JFrame;
>> import javax.swing.Timer;
>>
>> public class test extends JFrame {
>>    public test() {
>>      Timer timer = new Timer(900, event -> {
>>        System.out.println("-"); });
>>      addWindowListener(new java.awt.event.WindowAdapter() {
>>        @Override
>>        public void windowClosing(java.awt.event.WindowEvent
>> windowEvent) {
>>          System.out.println("Close"); }});
>>      setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
>>      setSize(400, 300);
>>      setVisible(true);
>>      timer.start();
>>    }
>>
>>    public static void main(String... args) {
>>      EventQueue.invokeLater(() -> new test());
>>    }
>> }
>>
>>
>> jeff@debian:~$ javac test.java
>> jeff@debian:~$ java -showversion test
>> java version "1.8.0_40"
>> Java(TM) SE Runtime Environment (build 1.8.0_40-b25)
>> Java HotSpot(TM) 64-Bit Server VM (build 25.40-b25, mixed mode)
>>
>> -
>> -
>> Close
>> -
>> -
>> -
>> -
>> ^Z
>> [1]+  Stopped                 java -showversion test
>> jeff@debian:~$ jobs
>> [1]+  Stopped                 java -showversion test
>> jeff@debian:~$ fg
>> java -showversion test
>> -
>> -
>> -
>> -
>> ^Cjeff@debian:~$
>>
>>
>
> and does it stop on your Linux (I assume) system if the delay is 1000ms
> or more?
>
Very consistantly
With 1000 it continues as long as I can stand.
With 1001 I get
-
Close
-
-
-
-
jeff@debian:~$

With 1002 I get
-
Close
-
-
-
jeff@debian:~$

With 1003 I get
-
Close
-
jeff@debian:~$

With 1500 I get
-
Close
-
jeff@debian:~$