-
Bug
-
Resolution: Fixed
-
P2
-
6u10
If you show a modal JDialog, then call across the JavaScript bridge and that shows anything that is also modal, then IE hangs (haven't tried firefox). So if your applet happens to be interacting with a complex ajax style web app that pops up modal dialogs itself, and you happen to do that while you're showing a modal JDialog, things freeze.
Turning "enable next generation java plug in" in the control panel works around the problem.
Can anyone reproduce this on their machines?
Code that reproduces the error:
FreezeTest.java
//no it's not in a package
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class FreezeTest extends JApplet {
public void init() {
System.out.println("init");
JButton button = new JButton("show dialog");
getContentPane().add(button);
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
Frame frame = (Frame) SwingUtilities.getAncestorOfClass(Frame.class, FreezeTest.this);
DialogTest test = new DialogTest(frame, true, FreezeTest.this);
test.setVisible(true);
}
});
}
public void destroy() {
System.out.println("destroy");
}
public void start() {
System.out.println("start");
}
public void stop() {
System.out.println("stop");
}
public String getAppletInfo() {
return "Dummy";
}
}
DialogTest.java
import netscape.javascript.JSObject;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.applet.Applet;
public class DialogTest extends JDialog {
private Applet applet;
public DialogTest(final Frame owner, boolean modal, final Applet applet) {
super(owner, modal);
setSize(500, 500);
this.applet = applet;
JPanel panel = new JPanel();
add(panel);
JButton button = new JButton("click me");
panel.add(button);
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
JOptionPane.showMessageDialog(DialogTest.this, "Modal?", "Modal?", JOptionPane.QUESTION_MESSAGE);
JSObject js = JSObject.getWindow(applet);
js.eval("freezeTest();");
}
});
}
}
freezetest.html
<html>
<head>
<title>FreezeTest</title>
<script type="text/javascript">
function freezeTest() {
alert("freeze?");
}
</script>
</head>
<body>
<h1>FreezeTest</h1>
<hr>
<object id="FreezeTestApplet" classid="clsid:CAFEEFAC-0016-0000-FFFF-ABCDEFFEDCBA"
width="300" height="200" align="center" valign="center"
codebase="/software/jre/jre-6u10-windows-i586-p.exe#Version=1,6,0,10"
border="0">
<param name="archive"
value="freezetest.jar"/>
<param name="code" value="FreezeTest"/>
</object>
<hr>
</body>
</html>
Steps to reproduce:
install Java 6 update 10
make sure "Enable the next-generation Java Plug-in (requires browser restart)" is checked in the Java Control Panel
build freezetest.jar
Open freezetest.html with Internet Explorer
click the button
a modal dialog is shown, click ok
another modal dialog (JOptionPane) is shown, click ok
a JavaScript call then shows an alert(), you cannot click ok, the jvm is frozen (java console won't respond)
if you click somewhere in the html page, then you can click ok, but IE is still frozen, and must be "end tasked" [edit: on a colleague's machine, IE shuts down ok, but the frozen dialog that can be "clicked out of", still occurs]
System Config:
Windows XP x64 with all the latest updates (except today's emergency security patch).
Internet Explorer 7.0.5730.11 (32-bit)
Vista (32-bit) + IE 7
Turning "enable next generation java plug in" in the control panel works around the problem.
Can anyone reproduce this on their machines?
Code that reproduces the error:
FreezeTest.java
//no it's not in a package
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class FreezeTest extends JApplet {
public void init() {
System.out.println("init");
JButton button = new JButton("show dialog");
getContentPane().add(button);
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
Frame frame = (Frame) SwingUtilities.getAncestorOfClass(Frame.class, FreezeTest.this);
DialogTest test = new DialogTest(frame, true, FreezeTest.this);
test.setVisible(true);
}
});
}
public void destroy() {
System.out.println("destroy");
}
public void start() {
System.out.println("start");
}
public void stop() {
System.out.println("stop");
}
public String getAppletInfo() {
return "Dummy";
}
}
DialogTest.java
import netscape.javascript.JSObject;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.applet.Applet;
public class DialogTest extends JDialog {
private Applet applet;
public DialogTest(final Frame owner, boolean modal, final Applet applet) {
super(owner, modal);
setSize(500, 500);
this.applet = applet;
JPanel panel = new JPanel();
add(panel);
JButton button = new JButton("click me");
panel.add(button);
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
JOptionPane.showMessageDialog(DialogTest.this, "Modal?", "Modal?", JOptionPane.QUESTION_MESSAGE);
JSObject js = JSObject.getWindow(applet);
js.eval("freezeTest();");
}
});
}
}
freezetest.html
<html>
<head>
<title>FreezeTest</title>
<script type="text/javascript">
function freezeTest() {
alert("freeze?");
}
</script>
</head>
<body>
<h1>FreezeTest</h1>
<hr>
<object id="FreezeTestApplet" classid="clsid:CAFEEFAC-0016-0000-FFFF-ABCDEFFEDCBA"
width="300" height="200" align="center" valign="center"
codebase="/software/jre/jre-6u10-windows-i586-p.exe#Version=1,6,0,10"
border="0">
<param name="archive"
value="freezetest.jar"/>
<param name="code" value="FreezeTest"/>
</object>
<hr>
</body>
</html>
Steps to reproduce:
install Java 6 update 10
make sure "Enable the next-generation Java Plug-in (requires browser restart)" is checked in the Java Control Panel
build freezetest.jar
Open freezetest.html with Internet Explorer
click the button
a modal dialog is shown, click ok
another modal dialog (JOptionPane) is shown, click ok
a JavaScript call then shows an alert(), you cannot click ok, the jvm is frozen (java console won't respond)
if you click somewhere in the html page, then you can click ok, but IE is still frozen, and must be "end tasked" [edit: on a colleague's machine, IE shuts down ok, but the frozen dialog that can be "clicked out of", still occurs]
System Config:
Windows XP x64 with all the latest updates (except today's emergency security patch).
Internet Explorer 7.0.5730.11 (32-bit)
Vista (32-bit) + IE 7