Name: krT82822 Date: 05/17/99


After some amount of time the JVM crashes with an access violation (c0000005)
when running my code. My programm is a realy simple example that uses
swing-JTextField (source-code attached).

The crash reproduces itself each time it runs, it crashes sometimes after 30
minutes, sometimes after a few hours. With the hotspot engine, it crashes
after 5 or 10 minutes!

Here is my source-code, please try it!

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;

class JavaTest extends JFrame
{
  public JavaTest()
  {
    setTitle(
      "JavaTest");
    setSize(
      1000, 400);
    addWindowListener(new WindowAdapter()
       { public void windowClosing(WindowEvent e)
          { System.exit(0);
          }
       } );

    JPanel loPanel1
      = new JPanel();
    loPanel1.setLayout(
      new GridLayout(5,5,5,5));
    
    inTexts
      = new JTextField[25];
    inThreads
      = new CounterThread[25];
    
    for (int loIdx=0;loIdx<inTexts.length;loIdx++)
    {
      inTexts[loIdx]
        = new JTextField();

      inTexts[loIdx].setEditable(
        false);
      inTexts[loIdx].setHorizontalAlignment(
        JTextField.CENTER);
        
      loPanel1.add(
        inTexts[loIdx]);
  
      inThreads[loIdx]
        = new CounterThread();
      inThreads[loIdx].setAttributes(
        this,inTexts[loIdx],150+loIdx*5);
      inThreads[loIdx].start(
        );
      //inThreads[loIdx].setPriority(
        //Thread.MAX_PRIORITY-2);
    }
    
    getContentPane().add(loPanel1);
  }
 
  public static void main(String[] args)
  {
    JavaTest loFrame
      = new JavaTest();
    loFrame.show(
      );
  }
  
  private JTextField[] inTexts;
  private CounterThread[] inThreads;
}


class CounterThread extends Thread
{
  public CounterThread()
  {
    super(
      );
    inCounter
      = MIN;
  }
  
  public void setAttributes(JavaTest paTest,JTextField paComp,int paDelay)
  {
    inTest
      = paTest;
    inComp
      = paComp;
    inDelay
      = paDelay;
  }

  
  public void run()
  {
    Thread myThread
      = Thread.currentThread();
    try
    {
      sleep(
        3000);
    }
    catch (InterruptedException e)
    {
      // the VM doesn't want us to sleep anymore,
      // so get back to work
    }
    while (this == myThread)
    {
      if ((inUp == true) && (inCounter < MAX))
      {
        inCounter
          +=1;
      }
      else if ((inUp == false) && (inCounter > MIN))
      {
        inCounter
          -=1;
      }
      else if (inCounter == MAX)
      {
        inUp
          = false;
      }
      else
      {
        inUp
          = true;
      }

      inComp.setText(
        "counter: " + inCounter);

      try
      {
        sleep(
          inDelay);
      }
      catch (InterruptedException e)
      {
        // the VM doesn't want us to sleep anymore,
        // so get back to work
      }
    }
  }
  
  private JTextField inComp;
  private JavaTest inTest;
  private int inDelay;
  private int inCounter;
  private boolean inUp
    = true;
  
  private final int MAX
    = 50;
  private final int MIN
    = -50;
}
(Review ID: 83133)
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