Here are the steps to reproduce this:
1. Set your system locale to Japanese.
win2k: Control Panel > Regional Options > General Tab.
 set your locale to Japanese.
 push "Set default..." button, set system locale to Japan.
You may be asked to reboot your pc.

start c:\WINNT\system32\eudcedit.exe

Make sure "Character Set" is "ShiftJIS"
Edit -> select code.
Create glyphs for 0xf040, f041, f045.
Save the UDC file as "Link with all Fonts".

2. Make sure your windows has MingLiU_HKSCS. You may need to download the drivers, fonts, etc. package from Microsoft. For more details see:
http://www.microsoft.com/hk/hkscs/

3. Start testcase with JDK 1.4.x.

UDC is displayed with glyphs created per step 1.

4. Start testcase with JDK5.0.

UDC are displayed as HKSCS characters.

Here is the test case:
import java.io.*;
import javax.swing.*;
import java.awt.*;


public class TestUDC extends JApplet
{
  public void init() {
  

    MyPanel panel = new MyPanel();
    Container cont = this.getContentPane();
    cont.add(panel);
   }
}
class MyPanel extends JPanel {
    JTextField fld01;
    String string1 = "\ue000\ue001\ue005\u65e5\u672c\u8a9eUDC";

    MyPanel() {
    
    int width = 50;
    int size = 12;

    fld01 = new JTextField(width);


    fld01.setText(string1);

    fld01.setFont(new Font("Dialog", Font.PLAIN,20));
    this.setLayout(new BorderLayout());
    this.add(fld01, BorderLayout.CENTER);

  }
}
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