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Quick Lists
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Bug ID:
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4674761
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Votes
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15
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Synopsis
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Plug-in and Netscape both freeze after a modal dialog is launched from JavaScrip
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Category
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java_plugin:plugin
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Reported Against
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1.4
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Release Fixed
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1.4.1_05
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State
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10-Fix Delivered,
Verified,
bug
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Priority:
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3-Medium
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Related Bugs
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Submit Date
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25-APR-2002
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Description
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FULL PRODUCT VERSION :
java version "1.3.1_03"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.1_03-b03)
Java HotSpot(TM) Client VM (build 1.3.1_03-b03, mixed mode)
FULL OPERATING SYSTEM VERSION :
Microsoft Windows 2000 [Wersja 5.00.2195]
ADDITIONAL OPERATING SYSTEMS :
Windows 98
Windows 98 SE
EXTRA RELEVANT SYSTEM CONFIGURATION :
Netscape 6, version 6.2
Mozilla, build 2002041711
A DESCRIPTION OF THE PROBLEM :
Basically speaking, bug identical to 4506751 (which regards
Java Plugin for Internet Explorer and was fixed) cause
lock-up problem in Java Plugin for Netscape.
The problem is that the browser and plug-in become locked-up
after a modal dialog is shown when invoked via JavaScript.
I have been able to reproduce this problem with Java Plug-in
1.3.0, 1.3.1, and 1.4.0. As the most simple scenario,
imagine an HTML document with an Applet and a form with a
button that has a JavaScript method that is called when the
button is pressed.
The onPressed event calls a JavaScript method that gets the
Applet and then makes a call into a method that brings up a
modal dialog. This modal dialog can be a Swing Dialog such
as JOptionPane or a custom dialog. It does not matter.
I think bug is in one of npjava*.dll.
STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Identical to ones listed in report for bug 4506751.
EXPECTED VERSUS ACTUAL BEHAVIOR :
Expected: Dialog shown should get input from user.
Actual: Dialog shows and browser freezes.
ERROR MESSAGES/STACK TRACES THAT OCCUR :
None - JVM hangs.
This bug can be reproduced always.
---------- BEGIN SOURCE ----------
HTML page:
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-2">
<title>
HTML Test Page
</title>
</head>
<body>
AppletTest will appear below in a Java enabled browser.<br>
<applet
codebase = "."
code = "AppletTest.class"
name = "TestApplet"
width = "400"
height = "300"
hspace = "0"
vspace = "0"
align = "middle"
scriptable = true
mayscript = true
>
</applet>
<INPUT VALUE="J" TYPE="button"
onClick="document.applets[0].showJOption();alert('after')">
</body>
</html>
Java applet:
import java.awt.*;
import java.io.*;
import javax.swing.*;
public class AppletTest extends JApplet {
public AppletTest() {
}
public void init() {
super.init();
}
public void showJOption() {
System.out.println("showJ enter");
Frame f = (Frame)SwingUtilities.getRoot(this);
JOptionPane.showMessageDialog(f,"Message","Title",JOptionPane.INFORMATION_MESSAGE);
System.out.println("showJ exit");
}
}
---------- END SOURCE ----------
CUSTOMER WORKAROUND :
None found.
(Review ID: 145817)
======================================================================
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Work Around
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N/A
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Evaluation
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When Java method called from JavaScript pops up a modal dialog box, java plug-in wants to disable the browser window, at the same time browser is waiting for the java method to complete and hence we have a deadlock situation. This problem can be fixed by not completely blocking while making the java calls from javascript.
This will be fixed as part of 4516042
xxxxx@xxxxx 2002-04-25
This bug is fixed for IE as part of 4516042, we need to provide similar fix for netscape
xxxxx@xxxxx 2002-05-10
Confirmed in NS 7.
xxxxx@xxxxx 2002-07-31
The solution:
Having javascript to java call executing on new java thread, and having the calling thread continues to dispatch message.
xxxxx@xxxxx 2002-09-11
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Comments
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Submitted On 13-MAY-2002
bbszla
In Linux/Debian with Mozilla there is this bug too.
Submitted On 03-MAY-2003
MichalHobot
Now it's more then a year from submitting the bug and fixed
software is not yet released!!
How can you put "closed, fixed" when in fact this bug still
exist in all Java SDKs I can download?
PLEASE NOTE: JDK6 is formerly known as Project Mustang
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