Applet calling javascript function causing memory leak

Hi,
I'm troubleshooting one memory leak issue in my application and to do that I created one simple Java applet and HTML + javascript function to locate the problem.
Basically it's an applet calling a javascript function using a timer. The javascript function simply does nothing.
I tested in IE 8.0 and JRE 1.6.0_23-b05 and memory of IE keeps increasing.
I saw this bug http://bugs.sun.com/view_bug.do?bug_id=6857340 which seems related with my issue, but if I understand correctly from the page, the issue should have been fixed.
I posted this message to find out if others also find same issue and if there's a solution for this. If I comment out window.call("dummy", null); , memory will not climb up.
Java code
+public class Main extends Applet implements Runnable {+
public Applet currentApplet= this ;
+     public JSObject window = null;+
+public void run(){+
+          System.out.println("run..");+
+     }+
+public void start(){+
window = JSObject.getWindow(this);
int delay = 300; //milliseconds
+ActionListener taskPerformer = new ActionListener() {+
+public void actionPerformed(ActionEvent evt) {+
window.call("dummy", null);
+}+
+};+
new Timer(delay, taskPerformer).start();
+     }+
+public static void main(String[] args) {+
+          System.out.println("start...");+
+          Main main = new Main();+
+     main.start();+
+     }+
+}+
Javascript source code
+<html>+
+<head>+
+<script>+
+function dummy() {+
+     +
+}+
+</script>+
+</head>+
+<body>+
+<applet .... >+
+...+
+</html>+

Try this url:
http://www.inquiry.com/techtips/java_pro/10MinuteSolutions/callingJavaScript.asp
It also provides some examples.

Similar Messages

Does call to ptsname() cause memory leak?

Purify signalled that the call to ptsname() is a memory leak. ptsname() returns a char* and
apparently is doing this on the heap even though the man page says it is a static data area. My
question is whether we need to do a free() on the return from ptsname()?

I believe that there was a memory leak problem with DataSocket 3.0 which came with LabVIEW 5.1. Try upgrading DataSocket to 4.0.
http://digital.ni.com/softlib.nsf/web%2Fall%20software?OpenView&Start=1&Count=500&Expand=6#6
If that does not work, the problem may not have been resolved until LabVIEW 6. Also, if you happened to be using the French version of LabVIEW, contact tech support, there was a specific problem there which does have a work around.

Calling SetLocalTime in C# causes Memory Leak (WEC7)

Hello,
I use SetLocalTime() in C#. Everything works well if I start explorer.exe and my application. But if I don't start explorer.exe at system start. SetLocalTime() causes memory leak in my application. I call the function frequently every hour.
public static bool SetzeLokalZeit(SYSTEMDATETIME lpSystemTime)
#if DEADLOCKDETECT
using (DdMonitor.Lock(MyTimeLock, "MyTimeLock#1"))
#else
lock (MyTimeLock)
#endif
bool ret = false; // no Success
try
GLB.LogFile.MyWrite("SetLocalTime");
SYSTEMDATETIME loc = new SYSTEMDATETIME();
loc.wYear = lpSystemTime.wYear;
loc.wMonth = lpSystemTime.wMonth;
loc.wDayOfWeek = lpSystemTime.wDayOfWeek;
loc.wDay = lpSystemTime.wDay;
loc.wHour = lpSystemTime.wHour;
loc.wMinute = lpSystemTime.wMinute;
loc.wSecond = lpSystemTime.wSecond;
loc.wMilliseconds = lpSystemTime.wMilliseconds;
ret = SetLocalTime(ref loc);
if (!ret) // no Success
int err = Marshal.GetLastWin32Error();
if (err > 0)
GLB.LogFile.MyWrite("ERROR CODE:" + err.ToString());
else ret = true;
catch (Exception ex)
GLB.LogFile.MyWrite("000023 Exception" + ex.Message);
finally
GLB.LogFile.MyWrite("SetLocalTime Ende");
return ret;
Has someone an idea what's the problem?
Best regards,
Andreas

Hello,
Here the answers to the questions:
1. Does the SetLocalTime function succeed?
Calling SetLocalTime doesn't cause an exception an the local time is set correctly.
2. Do you still get the memory leak if you remove all other calls?
Yes. I have removed any other code, but I also get the memory leak.
3. Does the memory leak also occur when you do this from native code?
I have not tried it yet. But I will still make it...
[DllImport("coredll.dll")]
private static extern void GetLocalTime(ref SYSTEMDATETIME lpSystemTime);
[DllImport("coredll.dll", SetLastError = true)]
private static extern bool SetLocalTime(ref SYSTEMDATETIME lpSystemTime);
[StructLayout(LayoutKind.Sequential)]
public struct SYSTEMDATETIME
public ushort wYear;
public ushort wMonth;
public ushort wDayOfWeek;
public ushort wDay;
public ushort wHour;
public ushort wMinute;
public ushort wSecond;
public ushort wMilliseconds;
public static bool Pub_SetLocalTime(SYSTEMDATETIME lpSystemTime)
lock (MyTimeLock)
bool ret = false; // no Success
try
loc_set.wYear = lpSystemTime.wYear;
loc_set.wMonth = lpSystemTime.wMonth;
loc_set.wDayOfWeek = lpSystemTime.wDayOfWeek;
loc_set.wDay = lpSystemTime.wDay;
loc_set.wHour = lpSystemTime.wHour;
loc_set.wMinute = lpSystemTime.wMinute;
loc_set.wSecond = lpSystemTime.wSecond;
loc_set.wMilliseconds = lpSystemTime.wMilliseconds;
ret = SetLocalTime(ref loc_set);
if (!ret) // no Success
int err = Marshal.GetLastWin32Error();
if (err > 0)
MessageBox.Show("Win32 Error:", err.ToString());
else ret = true;
catch (Exception ex)
MessageBox.Show("SetLocalTime,Exception:", ex.ToString());
finally
return ret;
Best regards,
Andreas

Java Applet call javascript problem

Hi I have a web page as follow and embedded a applet. The applet call the java script, and instead of showing an alarm, the browser show the javascript code. Is that strange ? Any suggestion for this problem.
HTML:
================================================================
<HTML>
     <HEAD>
     function ShowEmbd()
          alert("Test Applet call Javascript");
     </SCRIPT>
     </HEAD>
     <BODY>
     <FORM NAME="AppletEmbdStart">
          <OBJECT classid="clsid:48B2DD7B-6B52-4DB0-97C9-ECB940113B47" id="CIVON_DEmbdObj" width="0" height="0"></OBJECT>
          <APPLET code="MyApplet.class" width="0" height="0"></APPLET>
     </FORM>
     </BODY>
</HTML>MyApplet.java
=========================================================================
import netscape.javascript.*;
public class MyApplet extends javax.swing.JApplet
     private JSObject m_win = null;
     private JSObject m_doc = null;
     public void init()
          getJSWin().call("ShowEmbd", null);
     private getJSDoc()
          if(m_doc == bull)
               m_doc = (JSObject) getJSWin().getMember("document");
          return m_doc;
     private JSObject getJSWin()
          if (m_win == null)
               m_win = netscape.javascript.JSObject.getWindow(this);
          return m_win;
}The page was load and it should call the applet MyApplet. The MyApplet should do the init() method and call the Javascript "ShowEmbd()", BUT, instead of show alert from ShowEmbd(), the browser show the code of ShowEmbd() itself ...... It did not run the javascript and shows the alert ??
The browser shows a message from status bar "The applet not initial" ???? why ???
Can anyone help ?!

On first look:
I am not sure about the Object Tag, but the Applet Tag requires the MAYSCRIPT attribute before Java can call Javascript.

SetObjectArrayElement causes memory leak

Hello There,
I have got a little problem that I'm not able to solve for myself. Look at this piece of
JNI code:
double** result = calculator->getResult();
jobjectArray table = env->NewObjectArray(height, env->FindClass("[D"), 0);
for (int i = 0;i < height;i++) {
     jdoubleArray row = env->NewDoubleArray(width);
     env->SetDoubleArrayRegion(row, 0, width, (jdouble*)result);
     env->SetObjectArrayElement(table, i, row);
     env->DeleteLocalRef(row);
This fragment causes a memory leak , but if I omit the env->SetObjectArrayElement(table, i, row);
call, there is no memory leak. I don't really know what exactly causes this memory leak and how
to fix it. Any help would be greatly appreciated ;-)
Michael

Ok I think the code snippet I posted was not complete...
double** result = calculator->getResult();
jobjectArray table = env->NewObjectArray(height, env->FindClass("[D"), 0);
for (int i = 0;i < height;i++) {
     jdoubleArray row = env->NewDoubleArray(width);
     env->SetDoubleArrayRegion(row, 0, width, (jdouble*)result);
     env->SetObjectArrayElement(table, i, row);
     env->DeleteLocalRef(row);
jobject rawData = env->NewObject(classreg["data/rawdata1d"], methodIDreg["data/rawdata1d/init"], width, height);
env->SetObjectField(rawData, fieldIDreg["data/rawdata1d/data"], table);
return rawData;
The array I create is set as a member of a Java object which
is then returned by the native method. As long as this object
is in use by my program it's clear that the memory I allocated
for the array never gets released. But when the Java object is
no longer used by my program and the garbage collector releases
the memory occupied by this object, shouldn't it release the memory
occupied by the array I created in my native method too? Apparently
this is not the case, do I have to release the Java array for myself?
Michael
Edited by: Michael_JavaAddict on Aug 25, 2010 3:03 AM

How to call javascript function in back bean of jsf

hi,
i am trying to call java script function in back bean but not done. Is there any code for call javascript function in bean file.

Java runs at server side.
JSF produces HTML output.
Server sends HTML output to client.
Java stops running.
HTML runs at client side.
JS starts to run in HTML.
Clear? Java is a server side language. JS is a client side language. To run JS using JSF, simply print it out to the HTML so that it get invoked when the HTML runs.

How to call javascript function from PL/SQL procedure

Can anybody advice me how to call javascript function from PL/SQL procedure in APEX?

Hi,
I have a requirement to call Javascript function inside a After Submit Process.
clear requirement below:
1. User selects set of check boxes [ say user want to save 10 files and ticks 10 checkboxes]
2. user clicks on "save files" button
3. Inside a After submit process, in a loop, i want to call a javascript function for each of the file user want to save with the filename as a parameter.
Hope this clarify U.
Krishna.

JSF: partial page rendering is causing memory leak leading to outofmemory

JDeveloper 10.1.3.2.0
JDK: 1.6.0_06
Operating System: Windows XP.
I test my application for memory leaks. For that purpose, I use jconsole to monitor java heap space. I have an edit page that has two dependent list components. One displays all countries and the other displays cities of the selected country.
I noticed java heap space keeps growing as I change country from country list.
I run garbage collection and memory usage does not go down. If I keep changing the province for 5 minutes, then I hit a java heap space outofmemory exception.
To narrow down the problem, I removed the second city component and the problem still exists.
To narrow it down further, I removed autosubmit attribute from the country component and then memory usage stopped increasing as I change country.
country/city partial page rendering is just an example. I am able to reproduce the same problem on every page where i use partial page rendering. My conclusion is PPR is causing memory leak or at least the autosubmit attribute.
This is really bad. Anyone out there experienced same issue. Any help/advice is highly appreciated !!
Thanks
<af:panelLabelAndMessage
inlineStyle="font-weight:bold;"
label="Country:"
tip=" "
showRequired="true"
for="CountryId">
<af:selectOneChoice id="CountryId"
               valuePassThru="true"
               value="#{bindings.CountryId.inputValue}"
               autoSubmit="true"
               inlineStyle="width:221px"
               simple="true">
     <af:forEach var="item"
          items="#{bindings.CountriesListIterator.allRowsInRange}">
     <af:selectItem value="#{item.countryId}"
               label="#{item.countryName}"/>
     </af:forEach>
</af:selectOneChoice>
</af:panelLabelAndMessage>
<af:panelLabelAndMessage
inlineStyle="font-weight:bold;"
label="City:"
tip=" "
showRequired="true"
for="CityId">
<af:selectOneChoice id="CityId"
               valuePassThru="true"
               value="#{bindings.CityId.inputValue}"
               partialTriggers="CountryId"
               autoSubmit="true"
               inlineStyle="width:221px"
               unselectedLabel="--Select City--"
               simple="true">
     <f:selectItems value="#{backing_CountryCityBean.citiesSelectItems}"/>
</af:selectOneChoice>
</af:panelLabelAndMessage>

Samsam,
I haven't seen this problem myself, no.
To clarify - are you seeing this behaviour when running your app in JDeveloper, or when running in an application server? If in JDeveloper, a copuple of suggestions:
* (may not matter, but...) It's not supported to run JDev 10g with JDK 6
* have you tried the [url http://www.oracle.com/technology/pub/articles/masterj2ee/j2ee_wk11.html]memory profiler
Best,
John

How to call javascript function in Flash

Please help...
I have a site that run multiple of domain for example
Domain (A): raymond.com
Domain (B): raymond.ca
The problem is this.. when (B) html page load the flash file
that locate at (A) it load but non of the buttons work which call
javascript function using getURL("javascript:showpopup()"); But it
work fine if all reside on the same domain,eg( (A) html page load
flash file form (A)). Anyone know how to solve this other than
create a set of flash files on (B).
Regards,
Raymond

http://livedocs.adobe.com/flash/mx2004/main_7_2/wwhelp/wwhimpl/common/html/wwhelp.htm?cont ext=Flash_MX_2004&file=00001750.html

Call javascript function dynamically

Can this be done to call Javascript function dynamically? What I mean is suppose I use Javascript to submit form and target the reply to a popup window:
function cForm() {
     win=window.open('','myWin','toolbars=0');
     document.aForm.q.value='12345';
     document.aForm.target='myWin';
     document.aForm.submit();
}I target the form reply to popup window myWin. Suppose the reply body contains some Javascript function doX(). Is it possible to call doX() automatically, after the submit and the reply is loaded on myWin, maybe using some onload event in the popup window?

On the PopUo Windows BODY onLoad, call the method doX()

Call javascript function after submit process

Hi,
How can I call javascript function after my submit process ?
Thanks.

Hi Carl,
You say that I must have an Item or region that contains my js with conditionnal display. With this method I can execute my js with specific request value.
My problem is that I tried to integrate the "save large value workaround" in my application with the APEX wysiwyg (fckeditor). To do that I have to call the javascript function clob_submit on the save button. This function save the value of my field but if I want to save other item value, how can I do that ?
If I use your method, I will submit the page, save the other field and after that, I will branch on the same page. At this moment, I will execute my javascript file.
Is it what did you said ?
Sylvain Michaud
Homepage : http://www.insum.ca
InSum Solutions' blog : http://insum-apex.blogspot.com

How can i call javascript function with out internet connection?

I have trying to call javascript function through ExternalInterface. But flash player recomonding to have internet connectivity. i have allredy used allowscript="always" .

first, allow the folder that contains your flash files to connect to the internet by adjusting your security settings:
http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_manager04a.ht ml
then try the following in a swf and open the published html in your browser to test:
import flash.external.ExternalInterface
ExternalInterface.call("function(){alert('test');}")

Call JavaScript function from Acrobat Plugin

Hi All,
I want to call JavaScript function from Acrobat Plugin? Where is to write JavaScript function in Acrobat SDK? Please reply..
Thanks in advance..

Hi Malkyt,
Thanks.. where is to write JavaScript code in the application..
function GetWelcome()
alert("Welcome");
this above code. how to use this javascript code to plugin application.
static ACCB1 ASBool ACCB2 AVPageViewMouseClick (AVPageView pageView, AVDevCoord xhit, AVDevCoord yhit, AVFlagBits16 flags, AVTCount clickNo, void *data)
char jsscript[200];
AFExecuteThisScript (pddoc, jsscript, NULL);
i want to display welcome message of JS file.. give me step to perform above task.. Please reply...

IPad = webStageView = HTML = call javascript function thru Flash

Has anyone loaded a HTML file thru webStageView, and then been able to call javascript functions embeded in the HTML through flash.
I've seen references to using webStageViewBRIDGE but I think that has been depreciated.
Below is a link to a Adobe tutorial doing this with the htmlLoader class and FLEX.
Cross-scripting PDF content in an Adobe AIR application
http://www.adobe.com/devnet/air/flex/quickstart/articles/scripting_pdf.html
If anyone has successfully been able to do this on the iPad, could you explain how it's done or provide a link to some documentation.
Thanks...

Stagewebviewbridge is a 3rd party library (not an official Adobe product). It looks like it is still supported. The technique described should work even if the library isn't being actively developed.
http://code.google.com/p/stagewebviewbridge/wiki/Communication
Also, note that most techniques which use the HTMLLoader class will not work with the StageWebView class -- they are entirely different beasts. (Well, to be precise, on desktop computers, StageWebView uses the same Webkit code, but the interface to it is still very different.)

Can Java program cause memory leak?

Can Java program cause memory leak or memory crash? I don't mean any memory overflow related exceptions. I mean something like core dump in UNIX or error reports in Windows XP.
If it can really happen, in what circumstances? I raise such a question because our J2EE based system had really caused memory leak in Windows XP systems, but so far we still fail to troubleshoot the problem.

Your code may leak memory. There are many, many, many reasons this could be. All of them represent bugs in your code.
You should get a profiler to identify the problem spots of your code.
You spoke of a memory crash as well. The VM may crash with some bug in the VM, or a bug in native code but that is not relevent to your problem. A memory leak is a problem in your code.

Applet calling javascript function causing memory leak

Similar Messages

Maybe you are looking for