Calling an applet method from a Html file in the IE Java plug-in

FULL PRODUCT VERSION :
java version "1.5.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-b64)
Java HotSpot(TM) Client VM (build 1.5.0-b64, mixed mode, sharing)
and
java version "1.4.2_06"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_06-b03)
Java HotSpot(TM) Client VM (build 1.4.2_06-b03, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP
Version 2002
Service pack 1
IE 6.0.2800

EXTRA RELEVANT SYSTEM CONFIGURATION :
Pentium P4m 1.9Ghz
512 Ram

A DESCRIPTION OF THE PROBLEM :
I'm working on some Sun API (XMLEncoder) to obtain a Swing applet, and add some code for understanding the XMLEncoder.
The calling method works fine when I call the method getDocument() direct from the applet, from the getDocument() applet button.
But something goes wrong with writeObject when I call the method getDocument() from the html file?
I think that this must be some bug with the Java Plug-in in IE because with Nescape or with Mozilla using 1.4.2_04 there is no problem...

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Some people and me write a simple applet to show the problem...to see step-by-step the bug process.
1) Work great in IE:
key pressed the applet's button "GET", calling the applet method:

2) works for the html button: "String 22", calling the method
--> public String getDocument(String obj)

3) bug for the html button: "Integer 22 passed by script", calling the method:
--> public String getDocument(Integer obj) (this is the same method that works great from an direct calling from the applet button "GET")

3) bug for the html button: "Integer 22 hardcoded in applet", calling the method:
--> public String getDocument()


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
I would like the same result for all calling situations:
A right Object xml encoding:

<?xml version="1.0" encoding="UTF-8"?>
<java version="1.4.2_03" class="java.beans.XMLDecoder">
 <string>22</string>
</java>
ACTUAL -
Results for case:
1) String getDocument(Integer obj)
<?xml version="1.0" encoding="UTF-8"?>
<java version="1.4.2_03" class="java.beans.XMLDecoder">
 <int>22</int>
</java>

2) <?xml version="1.0" encoding="UTF-8"?>
<java version="1.4.2_03" class="java.beans.XMLDecoder">
 <string>22</string>
</java>

3) ERROR BUG!!!!!!!!! Nothing is encode
String getDocument(Integer obj)
java.lang.NullPointerException
Continuing ...
java.lang.Exception: discarding statement XMLEncoder0.writeObject(Integer0);
Continuing ...
<?xml version="1.0" encoding="UTF-8"?>
<java version="1.4.2_03" class="java.beans.XMLDecoder">
</java>

4) ERROR BUG!!!!!!!!! Nothing is encode
ava.lang.NullPointerException
Continuing ...
java.lang.Exception: discarding statement XMLEncoder0.writeObject(Integer0);
Continuing ...
<?xml version="1.0" encoding="UTF-8"?>
<java version="1.4.2_03" class="java.beans.XMLDecoder">
</java>

ERROR MESSAGES/STACK TRACES THAT OCCUR :
Results for case:
I would like the same result as the 1) & 2) but:

3) ERROR BUG!!!!!!!!! Nothing is encode
String getDocument(Integer obj)
java.lang.NullPointerException
Continuing ...
java.lang.Exception: discarding statement XMLEncoder0.writeObject(Integer0);
Continuing ...
<?xml version="1.0" encoding="UTF-8"?>
<java version="1.4.2_03" class="java.beans.XMLDecoder">
</java>

4) ERROR BUG!!!!!!!!! Nothing is encode
ava.lang.NullPointerException
Continuing ...
java.lang.Exception: discarding statement XMLEncoder0.writeObject(Integer0);
Continuing ...
<?xml version="1.0" encoding="UTF-8"?>
<java version="1.4.2_03" class="java.beans.XMLDecoder">
</java>

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
the applet code:

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import javax.swing.*;
import java.io.ByteArrayOutputStream;
import java.io.BufferedOutputStream;

public class Applethtml
    extends Applet {
  private boolean isStandalone = false;
  JPanel jPanel1 = new JPanel();
  BorderLayout borderLayout1 = new BorderLayout();
  JTextPane jTextPane1 = new JTextPane();
  JButton jButton = new JButton();
  public String getParameter(String key, String def) {
    return isStandalone ? System.getProperty(key, def) :
        (getParameter(key) != null ? getParameter(key) : def);
  }

  public Applethtml() {}

  public void init() {
    try {
      jbInit();
    }
    catch (Exception e) {
      e.printStackTrace();
    }
  }

  private void jbInit() throws Exception {
    jPanel1.setLayout(borderLayout1);
    jTextPane1.setText("Exemple");
    jButton.setText("Get");
    jButton.addKeyListener(new Applethtml_jButton_keyAdapter(this));
    this.addMouseListener(new Applethtml_this_mouseAdapter(this));
    this.addMouseListener(new Applethtml_this_mouseAdapter
                          (this));
    this.add(jPanel1, null);
    this.add(jTextPane1, null);
    this.add(jButton, null);
  }

  public void start() {}

  public void stop() {}

  public void destroy() {}

  public String getAppletInfo() {
    return "Information applet";
  }

  public String[][] getParameterInfo() {
    return null;
  }

  public String getDocument(String obj) {
    String enc = encode( (Object) obj);
    System.out.println(enc);
    return enc;
  }

  public String getDocument(Integer obj) {
    System.out.println("String getDocument(Integer obj)");
    String enc = encode( (Object) obj);
    System.out.println(enc);
    return enc;
  }

  public String getDocument() {
    Integer obj = new Integer(22);
    System.out.println( (Object) obj);
    String enc = encode( (Object) obj);
    System.out.println(enc);
    return enc;
  }

  private String encode(Object obj) {
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    baos.reset();
    java.beans.XMLEncoder xmlencoder = new java.beans.XMLEncoder(new
        BufferedOutputStream(baos));
    xmlencoder.writeObject(obj);
    xmlencoder.close();
    return
        baos.toString();
  }

  String jButton_keyPressed(KeyEvent e) {
    String codeRetour = (String) getDocument(new Integer(22));
    System.out.println("RESULT: " + codeRetour);
    return codeRetour;
  }

  String this_mouseClicked(MouseEvent e) {
    String codeRetour = (String) getDocument(new Integer(33));
    System.out.println("RESULT: " + codeRetour);
    return codeRetour;
  }
}

class Applethtml_jButton_keyAdapter
    extends java.awt.event.KeyAdapter {
  Applethtml adaptee;
  Applethtml_jButton_keyAdapter(Applethtml adaptee) {
    this.adaptee = adaptee;
  }

  public void keyPressed(KeyEvent e) {
    adaptee.jButton_keyPressed(e);
  }
}

class Applethtml_this_mouseAdapter
    extends java.awt.event.MouseAdapter {
  Applethtml adaptee;
  Applethtml_this_mouseAdapter(Applethtml adaptee) {
    this.adaptee = adaptee;
  }

  public void mouseClicked(MouseEvent e) {
    adaptee.this_mouseClicked(e);
  }
}

----------------------------------------------------------------------------------------------------
htmlfile:

<html>
  <head>
    <title> test_HTML</title>
    </head>
    <body>Exemple test<br>
      <applet codebase = "."
        code = "Applethtml.class"
archive="Applethtml.jar"
        name = "AppletTest"
        width = "400"
        height = "300"
        hspace = "0"
        vspace = "0"
        align = "middle">
        </applet>
        <BR>
          <input type="button"
            value="String 22"
            onClick="alert(AppletTest.getDocument('22'))">
            <input type="button"
              value="Integer 22 passed by script"
              onClick="alert(AppletTest.getDocument(22))">
              <input type="button"
                value="Integer 22 hardcoded in applet"
                onClick="alert(AppletTest.getDocument())">
                </body>
                </html>



---------- END SOURCE ----------
###@###.### 2004-12-06 21:12:47 GMT