FULL PRODUCT VERSION :
java version "1.5.0_06"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_06-b05)
Java HotSpot(TM) Client VM (build 1.5.0_06-b05, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [Version 5.1.2600]

A DESCRIPTION OF THE PROBLEM :
I have a program that updates the mouse cursor very often. With Java 1.5 after a while the whole system freezes. Task Manager shows that the number of GDI objects increases dramatically until the limit of 9999. Then the system nearly freezes until command prompt tells a OutOfMemory error.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
start the attached test program with
java cursor_update
(using for example java -Xmx256M cursor_update has the same problem, but it takes longer until it happens)

A frame with 800x600 pixels size will be created. Move the mouse in that area. The mouse cursor will be updated every 100 millisecons.
Wait a little bit and watch task manager showing the number of used GDI objects of the Java process

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Thought the Garbage collector would clear the native resources (GDI objects)
ACTUAL -
GDI objects increase, System nearly freezes

ERROR MESSAGES/STACK TRACES THAT OCCUR :
C:\arbeit\testprog\cursorbug>java cursor_update
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.util.*;

public class cursor_update implements WindowListener
{
  Frame ds_frame;
  Cursor ds_cursor;
  MemoryImageSource ds_mis;
  Image ds_img;
  Point ds_hotspot=new Point(0,0);
  int[] imr_rawdata=new int[1024];
  int im_color=0;
  boolean bo_changecursor=true;

  public static void main (String[] args)
  {
    cursor_update ds_cu = new cursor_update();
    ds_cu.go();
  }

  void go()
  {
    ds_frame = new Frame("Cursor Problem");
    ds_frame.addWindowListener(this);
    ds_frame.pack();
    ds_frame.setSize(800,600);
    ds_frame.show();
    while (bo_changecursor)
    {
      Arrays.fill(imr_rawdata,(0xFF000000 | im_color << 16) | im_color);
      ds_mis=new MemoryImageSource(32, 32, imr_rawdata, 0,32);
      ds_img=ds_frame.createImage(ds_mis);
      ds_cursor=ds_frame.getToolkit().createCustomCursor(ds_img,ds_hotspot,"CURSOR");
      ds_frame.setCursor(ds_cursor);

      im_color++;
      if (im_color>255)
      {
        im_color=0;
        try
        {
          Thread.sleep(100);
        }
        catch(InterruptedException ie)
        {}
      }

    }
  }

/**************************************************************/
/* Implementation of WindowListener */
/**************************************************************/

   public void windowActivated( WindowEvent wev )
   {
   }

   public void windowClosed( WindowEvent wev )
   {
   }

   public void windowClosing( WindowEvent wev )
   {
      System.out.println("windowClosing");
      bo_changecursor=false;
      ds_frame.dispose();
   }

   public void windowDeactivated( WindowEvent wev )
   {
   }

   public void windowDeiconified( WindowEvent wev )
   {
   }

   public void windowIconified( WindowEvent wev )
   {
   }

   public void windowOpened( WindowEvent wev )
   {
   }
}

---------- END SOURCE ----------