JDK: 1.4.1-rc
OS: Windows 2000, Windows 98

In a swing text component with "Intelligent KuangPin IME", keep typing at random to input Chinese at an "extremely fast" speed, an exception will be thrown as blow after a while.

java.lang.IllegalArgumentException: TextHitInfo is out of range
        at java.awt.font.TextLayout.checkTextHit(Compiled Code)
        at java.awt.font.TextLayout.getCaretInfo(Compiled Code)
        at java.awt.font.TextLayout.getCaretInfo(Compiled Code)
        at sun.awt.im.CompositionArea.getCaretRectangle(Compiled Code)
        at sun.awt.im.CompositionArea.getTextLocation(Compiled Code)
        at sun.awt.im.InputMethodContext.getTextLocation(Compiled Code)
        at sun.awt.im.iiimp.IIIMPAdapter$Lookup.lookupDraw(Compiled Code)
        at sun.awt.im.iiimp.InputContext.processLookupEvent(Compiled Code)
        at sun.awt.im.iiimp.InputContext.processEvent(Compiled Code)
        at sun.awt.im.iiimp.IIIMPDispatchEvent.processProtocol(Compiled Code)
        at sun.awt.im.iiimp.IIIMPClient.getReply(Compiled Code)
        at sun.awt.im.iiimp.IIIMPClient.request(Compiled Code)
        at sun.awt.im.iiimp.IIIMPClient.processKeyEvent(Compiled Code)
        at sun.awt.im.iiimp.InputContext.deliverKeyEvent(Compiled Code)
        at sun.awt.im.iiimp.InputContext.dispatchKeyEventImpl(Compiled Code)
        at sun.awt.im.iiimp.InputContext.dispatchKeyEvent(Compiled Code)
        at sun.awt.im.iiimp.IIIMPAdapter.dispatchEvent(Compiled Code)
        at sun.awt.im.InputContext.dispatchEvent(Compiled Code)
        at sun.awt.im.InputMethodContext.dispatchEvent(Compiled Code)
        at java.awt.Component.dispatchEventImpl(Compiled Code)
        at java.awt.Component.dispatchEvent(Compiled Code)
        at java.awt.LightweightDispatcher.processKeyEvent(Compiled Code)
        at java.awt.LightweightDispatcher.dispatchEvent(Compiled Code)
        at java.awt.Container.dispatchEventImpl(Compiled Code)
        at java.awt.Component.dispatchEvent(Compiled Code)
        at java.awt.EventQueue.dispatchEvent(Compiled Code)
        at java.awt.EventDispatchThread.run(Compiled Code)

--- Begin of Test code ---
import java.awt.event.*;
import javax.swing.*;
import java.awt.*;

public class InputDemo extends JFrame {
    public InputDemo()
    {
       JTextPane p = new JTextPane();
       p.setBounds(20,20,200,200);
       getContentPane().add(p);

       addWindowListener(new WindowAdapter ()
       {
           public void windowClosing(WindowEvent e)
           {
               System.exit(0);
           }
       });
    }
   
    public static void main(String[] args)
    {
        InputDemo d = new InputDemo();
        d.setBounds(200,200,400,400);
        d.show();
    }
}
--- End of Test code ---