This bug is related to bug 4326296 submitted for Solaris platform.
Problems identified with this bug are:
1. During a KEY_PRESSED Event, the keyCode=0 when the Caps Lock is set.
2. During KEY_TYPED Events, the modifiers section is not being set.

Code sample:
import java.awt.*;
import java.awt.event.*;

public class Test_Event extends Frame implements KeyListener{

  Test_Event() {
        super("Test_Event");
        setSize(250, 100);
        show();
        this.addKeyListener(this);
  }

  public static void main(String[] args) {
        Frame f = new Test_Event();
  }

  public void keyPressed(KeyEvent ke) {
        printEvent(ke);
  }

  public void keyReleased(KeyEvent ke) {
        printEvent(ke);
  }

  public void keyTyped(KeyEvent ke) {
        printEvent(ke);
  }

  private void printEvent(KeyEvent e) {
        System.out.println("KeyEvent = " + e);
  }
}


Output that demonstrates the problem:
C:\WINDOWS\Desktop>java Test_Event
KeyEvent = java.awt.event.KeyEvent[KEY_PRESSED,keyCode=18,keyChar='?',modifiers=Alt] on frame0
KeyEvent = java.awt.event.KeyEvent[KEY_PRESSED,keyCode=65,keyChar='a',modifiers=Alt] on frame0
KeyEvent = java.awt.event.KeyEvent[KEY_TYPED,keyCode=0,keyChar='a',modifiers=Alt] on frame0
KeyEvent = java.awt.event.KeyEvent[KEY_RELEASED,keyCode=18,keyChar='?'] on frame0
KeyEvent = java.awt.event.KeyEvent[KEY_RELEASED,keyCode=65,keyChar='a'] on frame0


KeyEvent = java.awt.event.KeyEvent[KEY_PRESSED,keyCode=20,Caps Lock] on frame0
KeyEvent = java.awt.event.KeyEvent[KEY_RELEASED,keyCode=20,Caps Lock] on frame0


KeyEvent = java.awt.event.KeyEvent[KEY_PRESSED,keyCode=18,keyChar='?',modifiers=Alt] on frame0
KeyEvent = java.awt.event.KeyEvent[KEY_PRESSED,keyCode=65,keyChar='A',modifiers=Alt] on frame0
KeyEvent = java.awt.event.KeyEvent[KEY_TYPED,keyCode=0,keyChar='A',modifiers=Alt] on frame0
KeyEvent = java.awt.event.KeyEvent[KEY_RELEASED,keyCode=18,keyChar='?'] on frame0
KeyEvent = java.awt.event.KeyEvent[KEY_RELEASED,keyCode=65,keyChar='A'] on frame0


C:\WINDOWS\Desktop>