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Bug
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Resolution: Fixed
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P3
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6u10
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b138
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x86
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windows_xp
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Verified
FULL PRODUCT VERSION :
Java Plug-in 1.6.0_20
Using JRE version 1.6.0_20-b02 Java HotSpot(TM) Client VM
ADDITIONAL OS VERSION INFORMATION :
Tested on Windows XP and Vista:
Vista: Microsoft Windows [Version 6.0.6002]
XP: Microsoft Windows XP [Version 5.1.2600]
EXTRA RELEVANT SYSTEM CONFIGURATION :
Internet Explorer version: 8.0.6001.18928
A DESCRIPTION OF THE PROBLEM :
When an applet obtains a reference to a JavaScript object (specifically using getMember() on the window object, the Javascript object is leaked ( not garbage collected)
STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Compile the applet and open the HTML page included below, and click the 'START' button.
EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Internet Explorer memory consumption should remain more or less constant
ACTUAL -
Internet Exploerer memory consumption expands by ~2.5 MB/Sec
REPRODUCIBILITY :
This bug can be reproduced always.
---------- BEGIN SOURCE ----------
HTML Page:
--------------------------------------
<html>
<body>
<p>In IE8, with Java Plug-in 1.6.0_20 (Using JRE version 1.6.0_20-b02), after clicking start IE memory consumption expands by ~2.5MB/Sec</p>
<button onclick="this.disabled=true;this.innerHTML='RUNNING';start()">START</button>
<div><applet width="1" height="1" id="TestApplet" code="TestApplet"></applet></div>
<script language="javascript">
function start()
{
setInterval(runOnce, 1000);
}
function runOnce()
{
var applet = document.applets['TestApplet'];
window.leakObject = {};
leakObject.string = generateString();
applet.test();
window.leakObject = null;
};
function generateString() // Generates a long string
{
var s = '';
while (s.length < 1000000)
{
s = s+';'+Math.random()+';'+s;
}
return s;
}
</script>
</body></html>
--------------------------------------
Java Applet:
--------------------------------------
import javax.swing.JApplet;
import netscape.javascript.JSObject;
public class TestApplet extends JApplet {
/**
*
*/
private static final long serialVersionUID = 1L;
/**
*
*/
private JSObject jsWin;
@Override
public void init() {
jsWin = JSObject.getWindow(this);
System.out.println("Applet initialized");
}
public void test()
{
Object leakObject = jsWin.getMember("leakObject");
}
}
--------------------------------------
---------- END SOURCE ----------
CUSTOMER SUBMITTED WORKAROUND :
Avoid sending Javascript Objects to the applet context. If it's a must, explicitly "dispose" these objects by removing all members (the objects will still be leaked, but the leak will be small if there are no referenced objects).
Java Plug-in 1.6.0_20
Using JRE version 1.6.0_20-b02 Java HotSpot(TM) Client VM
ADDITIONAL OS VERSION INFORMATION :
Tested on Windows XP and Vista:
Vista: Microsoft Windows [Version 6.0.6002]
XP: Microsoft Windows XP [Version 5.1.2600]
EXTRA RELEVANT SYSTEM CONFIGURATION :
Internet Explorer version: 8.0.6001.18928
A DESCRIPTION OF THE PROBLEM :
When an applet obtains a reference to a JavaScript object (specifically using getMember() on the window object, the Javascript object is leaked ( not garbage collected)
STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Compile the applet and open the HTML page included below, and click the 'START' button.
EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Internet Explorer memory consumption should remain more or less constant
ACTUAL -
Internet Exploerer memory consumption expands by ~2.5 MB/Sec
REPRODUCIBILITY :
This bug can be reproduced always.
---------- BEGIN SOURCE ----------
HTML Page:
--------------------------------------
<html>
<body>
<p>In IE8, with Java Plug-in 1.6.0_20 (Using JRE version 1.6.0_20-b02), after clicking start IE memory consumption expands by ~2.5MB/Sec</p>
<button onclick="this.disabled=true;this.innerHTML='RUNNING';start()">START</button>
<div><applet width="1" height="1" id="TestApplet" code="TestApplet"></applet></div>
<script language="javascript">
function start()
{
setInterval(runOnce, 1000);
}
function runOnce()
{
var applet = document.applets['TestApplet'];
window.leakObject = {};
leakObject.string = generateString();
applet.test();
window.leakObject = null;
};
function generateString() // Generates a long string
{
var s = '';
while (s.length < 1000000)
{
s = s+';'+Math.random()+';'+s;
}
return s;
}
</script>
</body></html>
--------------------------------------
Java Applet:
--------------------------------------
import javax.swing.JApplet;
import netscape.javascript.JSObject;
public class TestApplet extends JApplet {
/**
*
*/
private static final long serialVersionUID = 1L;
/**
*
*/
private JSObject jsWin;
@Override
public void init() {
jsWin = JSObject.getWindow(this);
System.out.println("Applet initialized");
}
public void test()
{
Object leakObject = jsWin.getMember("leakObject");
}
}
--------------------------------------
---------- END SOURCE ----------
CUSTOMER SUBMITTED WORKAROUND :
Avoid sending Javascript Objects to the applet context. If it's a must, explicitly "dispose" these objects by removing all members (the objects will still be leaked, but the leak will be small if there are no referenced objects).
- relates to
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- Resolved
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