P4
FULL PRODUCT VERSION :
java version "1.6.0_25"
Java(TM) SE Runtime Environment (build 1.6.0_25-b06)
Java HotSpot(TM) Client VM (build 20.0-b11, mixed mode, sharing)
ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [Version 5.1.2600]
EXTRA RELEVANT SYSTEM CONFIGURATION :
Internet Explorer 8
8.0.6001.18702
A DESCRIPTION OF THE PROBLEM :
An applet in the main page is called from javascript included in an iframe. The javascript object passed as argument in the call is leaked.
In the attached test case, the main page is TstApplet.html, including the Applet defined in TstApplet1.java
The main page contains an iframe showing page1.html and page2.html. Both pages include test.js creating a large javascript object (theJSobject) and passint it as argument in the call to the empty applet method.
Each page change triggers an applet call and makes the IE process grow by about 3 MBy.
Killing the Java Virtual Machine process where the applet is running smakes the IE process shrink.
STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Using the included or a similar test case, navigate from page1 to page2 and back, triggering the JavaScript to Applet calls.
EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Javascript object garbage collected and IE memory not growing. This is the behaviour in Firefox 4.
ACTUAL -
Each call leaks memory (probably the object passed as argument to the call). With the included test case, the IE process grows by 3 MBy on each call.
REPRODUCIBILITY :
This bug can be reproduced always.
---------- BEGIN SOURCE ----------
The test case is a mix of HTML, Javascript and Java.
---------------------------------------
TstApplet.html
---------------------------------------
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-15">
<title>Test</title>
</head>
<body>
<script language="Javascript">
var _app = navigator.appName;
if (_app == 'Netscape') {
document.write('<embed id="TSTApplet" type = "application/x-java-applet;version=1.6"',
' CODE = "tst.TstApplet1" JAVA_CODEBASE = "./classes"',
' WIDTH = "10px" HEIGHT = "10px" MAYSCRIPT = true scriptable = false',
' pluginspage = "http://java.sun.com/products/plugin/index.html#download">',
'</embed>');
} else if (_app == 'Microsoft Internet Explorer') {
document.write('<object id="TSTApplet" classid = "clsid:8AD9C840-044E-11D1-B3E9-00805F499D93"',
'codebase = "http://java.sun.com/update/1.6.0/jinstall-6u25-windows-i586.cab#Version=6,0,0,6"',
' WIDTH = "10px" HEIGHT = "10px" >',
'<PARAM NAME = CODE VALUE = "tst.TstApplet1" >',
'<PARAM NAME = CODEBASE VALUE = "./classes" >',
'<PARAM NAME = MAYSCRIPT VALUE = true >',
'<PARAM NAME = "type" value = "application/x-java-applet;version=1.6">',
'<PARAM NAME = "scriptable" value = "false">',
'</object>');
}
</script>
<iframe id="intFrame" scrolling="no" width="1024px" height="769px"
frameborder="0" marginheight="0" marginwidth="0" src="page1.html">
</iframe>
</body>
</html>
---------------------------------------
page1.html
---------------------------------------
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-15">
<script type="text/javascript" src="test.js"></script>
</head>
<body onload="INIT_DISPLAY();" onunload="END_DISPLAY();">
<p>Page 1</p>
<a href="page2.html">go to page 2</a>
</body>
</html>
---------------------------------------
page2.html
---------------------------------------
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-15">
<script type="text/javascript" src="test.js"></script>
</head>
<body onload="INIT_DISPLAY();" onunload="END_DISPLAY();">
<p>Page 2</p>
<a href="page1.html">go to page 1</a>
</body>
</html>
---------------------------------------
test.js
---------------------------------------
var TSTApplet = null;
var theJSobject = null;
function INIT_DISPLAY() {
theJSobject = new MyJSobjectDef();
theJSobject.startUpdate();
}
function END_DISPLAY() {
theJSobject.destroy();
}
MyJSobjectDef=function() {
var v = new Array();
for (i = 0; i < 20000; i++) {
v[i] = "1234567890" + i;
}
this.fd = v;
}
MyJSobjectDef.prototype.startUpdate=function() {
if (window.parent.parent) {
TSTApplet = window.parent.parent.document.getElementById("TSTApplet");
} else {
TSTApplet = window.parent.document.getElementById("TSTApplet");
}
if (TSTApplet) {
if (TSTApplet.isActive()) {
TSTApplet.tstMethod1(theJSobject);
}
}
}
MyJSobjectDef.prototype.destroy=function() {
theJSobject = null;
}
---------------------------------------
TstApplet1.java
---------------------------------------
package tst;
import javax.swing.JApplet;
import netscape.javascript.JSObject;
public class TstApplet1 extends JApplet {
private static final long serialVersionUID = 4329161461406592864L;
public void tstMethod1(JSObject arg1) {
System.out.println("TstApplet1.tstmethod1");
}
}
---------- END SOURCE ----------
CUSTOMER SUBMITTED WORKAROUND :
Explicitly emptying the JS object passed as argument before unloading the page seams to minimize the amount of memory leaked.
java version "1.6.0_25"
Java(TM) SE Runtime Environment (build 1.6.0_25-b06)
Java HotSpot(TM) Client VM (build 20.0-b11, mixed mode, sharing)
ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [Version 5.1.2600]
EXTRA RELEVANT SYSTEM CONFIGURATION :
Internet Explorer 8
8.0.6001.18702
A DESCRIPTION OF THE PROBLEM :
An applet in the main page is called from javascript included in an iframe. The javascript object passed as argument in the call is leaked.
In the attached test case, the main page is TstApplet.html, including the Applet defined in TstApplet1.java
The main page contains an iframe showing page1.html and page2.html. Both pages include test.js creating a large javascript object (theJSobject) and passint it as argument in the call to the empty applet method.
Each page change triggers an applet call and makes the IE process grow by about 3 MBy.
Killing the Java Virtual Machine process where the applet is running smakes the IE process shrink.
STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Using the included or a similar test case, navigate from page1 to page2 and back, triggering the JavaScript to Applet calls.
EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Javascript object garbage collected and IE memory not growing. This is the behaviour in Firefox 4.
ACTUAL -
Each call leaks memory (probably the object passed as argument to the call). With the included test case, the IE process grows by 3 MBy on each call.
REPRODUCIBILITY :
This bug can be reproduced always.
---------- BEGIN SOURCE ----------
The test case is a mix of HTML, Javascript and Java.
---------------------------------------
TstApplet.html
---------------------------------------
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-15">
<title>Test</title>
</head>
<body>
<script language="Javascript">
var _app = navigator.appName;
if (_app == 'Netscape') {
document.write('<embed id="TSTApplet" type = "application/x-java-applet;version=1.6"',
' CODE = "tst.TstApplet1" JAVA_CODEBASE = "./classes"',
' WIDTH = "10px" HEIGHT = "10px" MAYSCRIPT = true scriptable = false',
' pluginspage = "http://java.sun.com/products/plugin/index.html#download">',
'</embed>');
} else if (_app == 'Microsoft Internet Explorer') {
document.write('<object id="TSTApplet" classid = "clsid:8AD9C840-044E-11D1-B3E9-00805F499D93"',
'codebase = "http://java.sun.com/update/1.6.0/jinstall-6u25-windows-i586.cab#Version=6,0,0,6"',
' WIDTH = "10px" HEIGHT = "10px" >',
'<PARAM NAME = CODE VALUE = "tst.TstApplet1" >',
'<PARAM NAME = CODEBASE VALUE = "./classes" >',
'<PARAM NAME = MAYSCRIPT VALUE = true >',
'<PARAM NAME = "type" value = "application/x-java-applet;version=1.6">',
'<PARAM NAME = "scriptable" value = "false">',
'</object>');
}
</script>
<iframe id="intFrame" scrolling="no" width="1024px" height="769px"
frameborder="0" marginheight="0" marginwidth="0" src="page1.html">
</iframe>
</body>
</html>
---------------------------------------
page1.html
---------------------------------------
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-15">
<script type="text/javascript" src="test.js"></script>
</head>
<body onload="INIT_DISPLAY();" onunload="END_DISPLAY();">
<p>Page 1</p>
<a href="page2.html">go to page 2</a>
</body>
</html>
---------------------------------------
page2.html
---------------------------------------
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-15">
<script type="text/javascript" src="test.js"></script>
</head>
<body onload="INIT_DISPLAY();" onunload="END_DISPLAY();">
<p>Page 2</p>
<a href="page1.html">go to page 1</a>
</body>
</html>
---------------------------------------
test.js
---------------------------------------
var TSTApplet = null;
var theJSobject = null;
function INIT_DISPLAY() {
theJSobject = new MyJSobjectDef();
theJSobject.startUpdate();
}
function END_DISPLAY() {
theJSobject.destroy();
}
MyJSobjectDef=function() {
var v = new Array();
for (i = 0; i < 20000; i++) {
v[i] = "1234567890" + i;
}
this.fd = v;
}
MyJSobjectDef.prototype.startUpdate=function() {
if (window.parent.parent) {
TSTApplet = window.parent.parent.document.getElementById("TSTApplet");
} else {
TSTApplet = window.parent.document.getElementById("TSTApplet");
}
if (TSTApplet) {
if (TSTApplet.isActive()) {
TSTApplet.tstMethod1(theJSobject);
}
}
}
MyJSobjectDef.prototype.destroy=function() {
theJSobject = null;
}
---------------------------------------
TstApplet1.java
---------------------------------------
package tst;
import javax.swing.JApplet;
import netscape.javascript.JSObject;
public class TstApplet1 extends JApplet {
private static final long serialVersionUID = 4329161461406592864L;
public void tstMethod1(JSObject arg1) {
System.out.println("TstApplet1.tstmethod1");
}
}
---------- END SOURCE ----------
CUSTOMER SUBMITTED WORKAROUND :
Explicitly emptying the JS object passed as argument before unloading the page seams to minimize the amount of memory leaked.