Name: rlT66838 Date: 03/27/2000


java -version is N/A; this is with the 1.3rc1 version of the plugin

Source code would not be illustrative, as it is *any* use of JSObject;
the first time the browser starts everything works fine. Here is an excerpt
from some email where I initially described the problem:

 > The problem I'm seeing with IE has to do with using the JSObject class;
> > the first time I run an applet (Win98, IE 4.0, version 4.72.3110) with
> > the 1.3rc1 plugin, scripting seems to work fine, and JSObject works
> > (at least to the extent to which I've tried to use it!) However, after
> > exiting and restarting the browser, subsequent use of JSObject hangs
> > the thread which tries the call; I've seen this happen with both
> > JSObject.getWindow() and JSObject.getMember(), so it seems to be
> > something pretty fundamental (and it's quite repeatable - happens
> > every time).

Also, the plugin's Java console would fail to close.

This bug might be related to a problem I was having on my machine, due
to the following Microsoft bug:

http://support.microsoft.com/support/kb/articles/Q192/0/15.ASP

aka "Q192015"

which caused rpcss to croak on boot on occasion (and perhaps more often
than reported).

Whether this bug is related or not I have no idea; but since a person at
Sun who graciously tried to help me was unable to reproduce the problem,
I thought it deserved mention. (In any event, it would seem that JSObject
and applet scriptability ought not to be too dependent on whether rpcss
has wedged or not).

Also, this has some interesting side-effects - after killing the browser
via Win98's pseudo-task-manager, the desktop seems to have been hosed in
strange and interesting ways; apparently this has farther-reaching consequences
than just hanging a thread in an applet (when I was struggling with this,
I always rebooted immediately, rather than risk finding out what, exactly).

  Tom Anderson
###@###.###
(Review ID: 101960)
======================================================================

Name: rlT66838 Date: 04/10/2000


C:\WINDOWS>java -version
java version "1.3.0rc2"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.0rc2-Y)
Java HotSpot(TM) Client VM (build 1.3.0rc2-Y, mixed mode)

I have also foung a Bug Id 4325387 in the Bug Database that appers to be similar.


If i try to load a Applet more than one time the "Applet loadind dialog" hangs
in a loop.
The Applet has a JSObject. If I dont use the JSObject everything works fine.
This Problem only occurs in MS IE 4.01 SP1 and SP2. MS IE 5 works fine but i
need to use 4.01.
I have had this problem also with JRE 1.22 and JRE 1.3RC1


**********************************************
Source
**********************************************

package unbenannt1;

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import com.borland.jbcl.layout.*;
import com.borland.jbcl.control.*;
import javax.swing.*;
import netscape.javascript.*;

public class Applet2 extends Applet {
public String HTMLUrl=""; // Variable f?r die ?bergebene URL
public static JSObject win;
public static JSObject doc;



  XYLayout xYLayout1 = new XYLayout();
  boolean isStandalone = false;
  JButton jButton1 = new JButton();

  //Parameterwert holen
  public String getParameter(String key, String def) {
    return isStandalone ? System.getProperty(key, def) :
      (getParameter(key) != null ? getParameter(key) : def);
  }

  //Das Applet konstruieren
  public Applet2() {
  }

  //Das Applet initialisieren
  public void init() {
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }

  //Initialisierung der Komponente
  private void jbInit() throws Exception {
  String URL ;
  int ParPos1,ParPos2,ParPos3;
  String Par1="",Par2="",Par3="";
  boolean test;

    jButton1.setText("Stammdatenverwaltung");
    jButton1.addActionListener(new java.awt.event.ActionListener() {

      public void actionPerformed(ActionEvent e) {
        jButton1_actionPerformed(e);
      }
    });
    xYLayout1.setWidth(419);
    xYLayout1.setHeight(129);
    this.setLayout(xYLayout1);
    this.add(jButton1, new XYConstraints(110, 35, 179, 46));

    // die URL mit Parametern aus dem aufrufenden HTML lesen

    win = JSObject.getWindow(this);
    doc = (JSObject) win.getMember("document");
    HTMLUrl = (String) doc.getMember("URL");

    // Die Parameterstrings aus aus der URL filtern
    // Leerzeichen trennen die Parameter
    ParPos1 = 0;
    ParPos2 = 0;
    ParPos3 = 0;
    for (int i = 0; i < HTMLUrl.length() ; ++i) {
      System.err.println("Schleife : "+ HTMLUrl.substring(i,i+1));
      if (HTMLUrl.substring(i,i+1).equals("#")) {
         if (ParPos1 == 0) {
           ParPos1 = i;
         }
         else if (ParPos2 == 0) {
           ParPos2 = i;
         }
         else if (ParPos3 == 0) {
           ParPos3 = i;
         }

      }
    }
    if (ParPos1 != 0)Par1 = HTMLUrl.substring(ParPos1+1,ParPos2);
    if (ParPos2 != 0)Par2 = HTMLUrl.substring(ParPos2+1,ParPos3);
    if (ParPos3 != 0)Par3 = HTMLUrl.substring(ParPos3+1,HTMLUrl.length());

    System.out.println("Parameterposition 1 : "+ParPos1);
    System.out.println("Parameterposition 2 : "+ParPos2);
    System.out.println("Parameterposition 3 : "+ParPos3);
    System.out.println("Parameter 1 : "+Par1);
    System.out.println("Parameter 2 : "+Par2);
    System.out.println("Parameter 3 : "+Par3);

    // entsprechend der URL den passenden Frame und Datensatz anzeigen
    if (Par1.equals("Hydranten")) {
      //StammdatenHydranten dlg = new StammdatenHydranten(Par3);
      //dlg.show();
    }

    else if (Par1.equals("Raum")) {

      //StammdatenRaum dlg = new StammdatenRaum(Par3); // erstmal nur die
Objekt ID ?bergeben
      //dlg.show();
    }

    else if (Par1.equals("test")) {
      System.out.println("verzweigen zu Testframe");
    }
    //doc.clean();
    //win.close();


  }

  //Applet-Information holen
  public String getAppletInfo() {
    return "Applet-Information";
  }

  //Parameter-Infos holen
  public String[][] getParameterInfo() {
    return null;
  }

  void jButton1_actionPerformed(ActionEvent e) {
    //Frame1 dlg = new Frame1();
    //dlg.show();

  }
}
(Review ID: 103475)
======================================================================

Name: skT45625 Date: 07/26/2000


java version "1.3.0"

The bug is reported on J2SE 1.3.0 with the Internet Explorer 5.0 on Window NT
4.0 (SP5). The problem is that the static variables in a applet will not get
initialized at the 2nd time when the applet page is re-opened or re-loaded.
We believe this should be paid high attention because it breaks down the
integraty of the Java Language.

Procedure to reproduce the bug

A. The source StaticBug.java:

import netscape.javascript.*;
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;

public final class StaticBug extends JApplet implements ActionListener {
    static final String SHOW_VARIABLES = "Show Variables";
    static final String HELP = "Help";
    static final String CLOSE = "Close";
    // static variables to test
    static boolean staticBoolean = true;
    static String staticString = "Initialized";
    static JSObject staticWindow = null;
    // instance variable to test
    boolean instanceBoolean = true;
    String instanceString = "Initialized";
    
    JButton showButton, helpButton, closeButton;
    
    public void init() {
        showButton = new JButton(SHOW_VARIABLES);
        helpButton = new JButton(HELP);
        closeButton = new JButton(CLOSE);
        Container contentPane = getContentPane();
        contentPane.setBackground(new Color(255, 253, 208));
        contentPane.setLayout(new BoxLayout(contentPane, BoxLayout.X_AXIS));
        contentPane.add(Box.createHorizontalStrut(6));
        contentPane.add(showButton);
        contentPane.add(Box.createHorizontalStrut(6));
        contentPane.add(helpButton);
        contentPane.add(Box.createHorizontalStrut(6));
        contentPane.add(closeButton);
        contentPane.add(Box.createHorizontalStrut(6));
        showButton.addActionListener(this);
        helpButton.addActionListener(this);
        closeButton.addActionListener(this);
        System.err.println("\ninit() called.");
        showVariables();
    }
    
    public void destroy() {
        System.err.println("\ndestroy() called.");
    }
    
    private void showVariables() {
        System.err.println("Interesting Variables:");
        System.err.println("Static boolean = " + staticBoolean);
        System.err.println("Static string = " + staticString);
        if(staticWindow != null) {
            System.err.println("Static window = " + staticWindow.hashCode());
        } else {
            System.err.println("Static window = null");
        }
        System.err.println("Instance boolean = " + instanceBoolean);
        System.err.println("Instance string = " + instanceString);
        System.err.println("Instance applet = " + hashCode());
    }
    
    public void actionPerformed(ActionEvent e) {
        String command = e.getActionCommand();
        System.err.println("\nCommand issued: " + command);
        if(command.equals(SHOW_VARIABLES)) {
            showVariables();
        } else if(command.equals(HELP)) {
            staticBoolean = false;
            staticString = "changed";
            instanceBoolean = false;
            instanceString = "changed";
            try {
                staticWindow = JSObject.getWindow(this);
                staticWindow.eval("showHelpPage()");
            } catch(JSException jse) {
                System.err.println(jse.toString());
            }
            showVariables();
        } else if(command.equals(CLOSE)) {
            try {
                staticWindow = JSObject.getWindow(this);
                staticWindow.eval("window.close()");
            } catch(JSException jse) {
                System.err.println(jse.toString());
            }
        }
    }
}

B. The Testing Page

The page is located at http://netspread.com/bug/test.html. The page will lead
you to the Applet page. Use the following the procedure to observe the bug.
1. Close all IE windows
2. Open IE with url http://netspread.com/bug/test.html
3. Press "Start To Test" button.
4. Observe all variables:
    The static boolean is true. The static string is "initialized".
    The instance boolean is true. The instance string is "initialized".
5. Press "Help" button.
6. Observe all variables:
   The static boolean is false. The static string is "changed".
   The instance boolean is false. The instance string is "changed".
7. Press "Close" button.
8. Press "Start To Test" button.
9. Observe all variables:
    The static boolean is false. The static string is "changed".
    The instance boolean is true. The instance string is "initialized".
    The static variables are not get initialized as the instance variables!
10. If you click the "Help" or "Close" button, the Java Plugin hangs!
11. To repeat, go to step 1.

C. The Applet Page
The applet page is located at http://netspread.com/bug/StaticBug.html.
The contents is as follows:

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
<html>

<head>
<title>Static Bug</title>
</head>
<script language="JavaScript">
function showHelpPage() {
    window.open
("help.html", "helpwindow", "status=no,toolbar=yes,menubar=no,scrollbars=yes,res
izable=yes,width=500,height=400");
}
</script>
<body bgcolor="#FFFDD0">

<p><big><font face="Times New Roman">Open the Java Console and watch it when
pressing "Show Variables" button. The Help button will reset all booleans to
false and strings to "initialized".</font></big></p>

<p align="center">
<object classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93" width="270"
height="34"
codebase="http://java.sun.com/products/plugin/1.3/jinstall-13-
win32.cab#Version=1,3,0,0">
  <param name="code" value="StaticBug.class">
  <param name="type" value="application/x-java-applet;version=1.3">
  <param name="mayscript" value="true">
  <comment>
  <embed type="application/x-java-applet;version=1.3"
java_code="StaticBug.class"
   width="270" height="34" mayscript="true"
   pluginspage="http://java.sun.com/j2se/1.3/jre/download-windows.html">
  </comment>
  </embed>
</object>
</p>
</body>
</html>

D. The help.html can be anything.
(Review ID: 107590)
======================================================================