Jvm unnamed windows events handle leak 1.3.1_08-b03 - 1.4.2-b28

Hello,
I have an server application that leaks windows unnamed event handles on small loads. (200 network connections) I've used the process explorer from www.sysinternals.com to find the type of handles that where leaking. I've run my application through jprobe several times and i'm not leaking any java objects. it doesn't happen on every run. It can run about 5 to 10 times with no leak but as i continue running a request that has 200 network connnections it will leak one handle. Over time they add up memory increases and eventually we get a out of memory error and the server has to be restarted
My application uses the following
java version "1.3.1_08"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.1_08-b03)
Java HotSpot(TM) Client VM (build 1.3.1_08-b03, mixed mode)
windows server 2000 service pack 3 (I've tried sp1 and sp2 same issue)
starting and stopping threads
inet jdbc driver una2000
zlib compression libraries
encryption DES
sockets
no jni code
My network code uses input.available() and Socket.setSoTimeout() I don't think the setSoTimeOut time is timing anything out on these small runs.
I've also have run it with
java version "1.4.2"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2-b28)
Java HotSpot(TM) Client VM (build 1.4.2-b28, mixed mode)
I've tried not stopping any threads from my thread pool and it made no change. It still leaks! :-(
Does anyone know what creates the unamed event handles? Are they created by synchronization? Since my applications uses so many different api's it's like looking for a needle in a hay stack.
p.s. I've been working on this problem on and off for about 1 month. I've search the java forums and google.
Thanks
Alexander Anguiano

My message has been here for a while and is off the first page. :-( Oh, well. I thought I would update this just incase anyone was following it. (can I award my self those duke dollars?)
I think i've found the problem of why we are leaking handles. In the first 10 minutes it leaked 3 handles.(they may not have leaked but are resource that our application needed because of all the lazy initialization that we do) I've been runing a 200 task request every 5 minutes for the last 6 hours and have not leak any handles. The problem appears to be with calls to socket.setSoTimeout. I set it to 0. This effectively tells the socket to never time out. This is not an acceptable solution to the problem. I will be working on that next.
Has any one had problems with the socket.setSoTimeout?
If not then it may have to do with our simulated select. We have one thread that handles connection. Once the connection is established it's put on a list that get's polled [input.available()] that is handled by thread 2 if there is data then it gets handled by a worker thread [thread n-12]. Once the worker thread has read up to 4K of data it is put back on thread 2. I'm thinking that it has to do with so many thread doing a little work on it.

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Hi,
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Event handling operation on other software windows

Hi friends
I am able to execute another external program through java code using
Runtime.getRuntime().exec();
But now I want to perform Event Handling operation on such a opened external program(software) window.
Is it possible in Java to perform Event Handling operation on other software windows.
Thanks

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Opening a new window from an event handler in IC WebUI

Hello ,
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Hi,
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pass your dynamic URL here to lv_url. Dont Pass anything to ls_button-on_click.
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Window: close event handler

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Sleutel Bind, fancy key events handler for standalone window managers

I began using Openbox in my laptop a while ago, and I was amazed by the speed, customization and simplicity it provides. After I started customizing my desktop I noticed that some of the special keys (TouchpadToggle, Volume, PrintScreen, etc) didn't worked at all. There are some applications for the Volume keys to work, but not for keys like touchpad-toggle and print-screen. Of course, there's a workaround for each case using simple scripts, but I wanted something a little more fancy, so I made:
Sleutel Bind
It's made in C and provides key events handling for:
XF86TouchpadToggle
Print (prtsc key)
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Feel free to post your thoughts about Sleutel Bind, it's my first contribution to the community.
How to use
Once installed just run the command as a normal user.
If using openbox, place the following command in the "~/.config/openbox/autostart" file:
sleutelb &
Links
AUR
github
Last edited by DanielRS (2013-03-01 21:58:35)

mgmillani wrote:
I believe it must have been a bug and it was fixed, since print screen now works as expected. I'm using xmonad version 0.11-9, with ghc version 7.8.3.
davama wrote:
Note: for my print key to be recognized by xev i had to hold the ctrl key. that way it was not registered by xmonad. Also for xev command i use
xev | grep -A2 --line-buffered '^KeyRelease' | sed -n '/keycode /s/^.*keycode $[0-9]*$.* (.*, $.*$).*$/\1 \2/p'
Nice, that seems to be useful. Thanks!
@LQYMGT
Do you still have issues with the latest version? Otherwise I will mark this thread as solved.
well, still do not work... But I do not want to try it any more...So you can mark.

RMI, event handling, and Winow.dispose()

Hi all,
If you combine RMI with an event handler and java.awt.Window.dispose(), the JVM hangs. The only way to solve this problem is by disposing of the frame from within SwingUtilities.invokeLater.
Please check the following code:
ServerInterface.java:_
import java.rmi.Remote;
import java.rmi.RemoteException;
public interface ServerInterface extends Remote {
    void Send(ClientInterface CI) throws RemoteException;
ClientInterface.java:_
import java.rmi.Remote;
import java.rmi.RemoteException;
public interface ClientInterface extends Remote {
    void Send() throws RemoteException;
Server.java:_
import java.rmi.RemoteException;
import java.rmi.server.UnicastRemoteObject;
import java.rmi.Naming;
public class Server extends UnicastRemoteObject implements ServerInterface {
public Server() throws RemoteException {}
public void Send (ClientInterface CI)
try { CI.Send(); } catch (Throwable t){System.out.println(t);}
public static void main(String args[])
try {
      Naming.rebind      ( "rmi://localhost:1099/Testing",new Server() );
      System.err.println ("Server ready");
catch ( Throwable t )
        System.out.println ( t );
Client.java:_
import java.rmi.RemoteException;
import java.rmi.server.UnicastRemoteObject;
import java.rmi.Naming;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.SwingUtilities;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JButton;
public class Client extends UnicastRemoteObject implements ClientInterface,ActionListener {
static JFrame A=null;
static ServerInterface ServerSide;
private Client() throws RemoteException {}
public void Send()
if ( A == null )
     A = Display("Remove");                   // display frame
else                                // remove frame
     SwingUtilities.invokeLater ( new Runnable(){public void run(){A.dispose();A=null;}} );
public static void main(String[] args)
try {
      ServerSide = (ServerInterface) Naming.lookup ( "rmi://localhost:1099/Testing" );
      ServerSide.Send(new Client());
catch ( Throwable t )
        System.out.println ( t );
public void actionPerformed(ActionEvent e)
try { ServerSide.Send(new Client()); } catch (Throwable t){System.out.println(t);}
private JFrame Display (String label)
JButton b = new JButton (label);
b.addActionListener(this);
JPanel p = new JPanel ();
p.add (b);
JFrame frame = new JFrame ();
frame.getContentPane().add(p);
frame.pack();
frame.setVisible(true);
return frame;
}You can do any GUI work from within an event handler, only when you try to dispose of a frame, the system hangs !!!

Thank you for responding to my problem.
unless their documentation says otherwise (eg: repaint). I checked the API for "repaint()", but it didn't mention anything about the EDT. What documentation you are referring to ?
What I don't understand is that why "dispose()" works well on non-RMI systems and hangs the machine on RMI systems ? It even works fine on RMI system providing that you are not disposing of the frame from within an event handler. So the problem occurs only if you are combining the three elements: RMI, event handler, and dispose().
Conversely, you should avoid doing anything that may take a long time on the EDT. Perhaps remote methods fall into that category.It is true that we should avoid doing anything that may take a long time on the EDT; however, in this particular example, dispose() is not done through a remote call, it is done on the client where the frame should be removed.
I also tried disposing of the frame from within a normal Thread (instead of the EDT), and it worked just fine.

Registry handles leaked from

+
System
Provider
[ Name]
Microsoft-Windows-User Profiles Service
[ Guid]
{89B1E9F0-5AFF-44A6-9B44-0A07A7CE5845}
[ EventSourceName]
profsvc
EventID
1530
[ Qualifiers]
32768
Version
0
Level
3
Task
0
Opcode
0
Keywords
0x80000000000000
TimeCreated
[ SystemTime]
2011-06-11T07:37:12.000Z
EventRecordID
127007
Correlation
Execution
[ ProcessID]
0
[ ThreadID]
0
Channel
Application
Computer
Panther-PC
Security
[ UserID]
S-1-5-18
EventData
Detail
16 user registry handles leaked from \Registry\User\S-1-5-21-1082989139-2594333343-3947924465-1001: Process 2384 (\Device\HarddiskVolume1\Program Files\Common Files\microsoft shared\Windows Live\WLIDSVC.EXE) has opened key \REGISTRY\USER\S-1-5-21-1082989139-2594333343-3947924465-1001
Process 2384 (\Device\HarddiskVolume1\Program Files\Common Files\microsoft shared\Windows Live\WLIDSVC.EXE) has opened key \REGISTRY\USER\S-1-5-21-1082989139-2594333343-3947924465-1001 Process 2384 (\Device\HarddiskVolume1\Program Files\Common Files\microsoft
shared\Windows Live\WLIDSVC.EXE) has opened key \REGISTRY\USER\S-1-5-21-1082989139-2594333343-3947924465-1001 Process 2384 (\Device\HarddiskVolume1\Program Files\Common Files\microsoft shared\Windows Live\WLIDSVC.EXE) has opened key \REGISTRY\USER\S-1-5-21-1082989139-2594333343-3947924465-1001
Process 828 (\Device\HarddiskVolume1\Program Files\NVIDIA Corporation\nTune\nTuneService.exe) has opened key \REGISTRY\USER\S-1-5-21-1082989139-2594333343-3947924465-1001 Process 2384 (\Device\HarddiskVolume1\Program Files\Common Files\microsoft shared\Windows
Live\WLIDSVC.EXE) has opened key \REGISTRY\USER\S-1-5-21-1082989139-2594333343-3947924465-1001\Software\Microsoft\SystemCertificates\My Process 2384 (\Device\HarddiskVolume1\Program Files\Common Files\microsoft shared\Windows Live\WLIDSVC.EXE) has opened key
\REGISTRY\USER\S-1-5-21-1082989139-2594333343-3947924465-1001\Software\Microsoft\SystemCertificates\CA Process 2384 (\Device\HarddiskVolume1\Program Files\Common Files\microsoft shared\Windows Live\WLIDSVC.EXE) has opened key \REGISTRY\USER\S-1-5-21-1082989139-2594333343-3947924465-1001\Software\Microsoft\SystemCertificates\Root
Process 2384 (\Device\HarddiskVolume1\Program Files\Common Files\microsoft shared\Windows Live\WLIDSVC.EXE) has opened key \REGISTRY\USER\S-1-5-21-1082989139-2594333343-3947924465-1001\Software\Microsoft\SystemCertificates\SmartCardRoot Process 2384 (\Device\HarddiskVolume1\Program
Files\Common Files\microsoft shared\Windows Live\WLIDSVC.EXE) has opened key \REGISTRY\USER\S-1-5-21-1082989139-2594333343-3947924465-1001\Software\Microsoft\SystemCertificates\TrustedPeople Process 2384 (\Device\HarddiskVolume1\Program Files\Common Files\microsoft
shared\Windows Live\WLIDSVC.EXE) has opened key \REGISTRY\USER\S-1-5-21-1082989139-2594333343-3947924465-1001\Software\Microsoft\SystemCertificates\trust Process 2384 (\Device\HarddiskVolume1\Program Files\Common Files\microsoft shared\Windows Live\WLIDSVC.EXE)
has opened key \REGISTRY\USER\S-1-5-21-1082989139-2594333343-3947924465-1001\Software\Policies\Microsoft\SystemCertificates Process 2384 (\Device\HarddiskVolume1\Program Files\Common Files\microsoft shared\Windows Live\WLIDSVC.EXE) has opened key \REGISTRY\USER\S-1-5-21-1082989139-2594333343-3947924465-1001\Software\Policies\Microsoft\SystemCertificates
Process 2384 (\Device\HarddiskVolume1\Program Files\Common Files\microsoft shared\Windows Live\WLIDSVC.EXE) has opened key \REGISTRY\USER\S-1-5-21-1082989139-2594333343-3947924465-1001\Software\Policies\Microsoft\SystemCertificates Process 2384 (\Device\HarddiskVolume1\Program
Files\Common Files\microsoft shared\Windows Live\WLIDSVC.EXE) has opened key \REGISTRY\USER\S-1-5-21-1082989139-2594333343-3947924465-1001\Software\Policies\Microsoft\SystemCertificates Process 2384 (\Device\HarddiskVolume1\Program Files\Common Files\microsoft
shared\Windows Live\WLIDSVC.EXE) has opened key \REGISTRY\USER\S-1-5-21-1082989139-2594333343-3947924465-1001\Software\Microsoft\SystemCertificates\Disallowed
should i be worried or can i get some help with this ?

I'm having the same problem on one of work's Server 2008 R2 machines, but the software causing the leaks are the Microsoft Windows programs
cmd.exe
robocopy.exe
conhost.exe
Microsoft can you please stop your software from leaking, thank you.
From the event viewer
Windows detected your registry file is still in use by other applications or services. The file will be unloaded now. The applications or services that hold your registry file may not function properly afterwards.
DETAIL -
6 user registry handles leaked from \Registry\User\S-1-5-21-3799963273-679199981-738785089-500:
Process 2348 (\Device\HarddiskVolume2\Windows\System32\cmd.exe) has opened key \REGISTRY\USER\S-1-5-21-3799963273-679199981-738785089-500
Process 6532 (\Device\HarddiskVolume2\Windows\System32\Robocopy.exe) has opened key \REGISTRY\USER\S-1-5-21-3799963273-679199981-738785089-500
Process 2348 (\Device\HarddiskVolume2\Windows\System32\cmd.exe) has opened key \REGISTRY\USER\S-1-5-21-3799963273-679199981-738785089-500\Software\Microsoft\Windows NT\CurrentVersion
Process 2348 (\Device\HarddiskVolume2\Windows\System32\cmd.exe) has opened key \REGISTRY\USER\S-1-5-21-3799963273-679199981-738785089-500\Control Panel\International
Process 6700 (\Device\HarddiskVolume2\Windows\System32\conhost.exe) has opened key \REGISTRY\USER\S-1-5-21-3799963273-679199981-738785089-500\Control Panel\International
Process 6532 (\Device\HarddiskVolume2\Windows\System32\Robocopy.exe) has opened key \REGISTRY\USER\S-1-5-21-3799963273-679199981-738785089-500\Control Panel\International

Handle leak

Why does each iteration of this code leak 4 handles? Is there some other statement that must be issued to cleanup the Oracle connection completely?
The program was run from Jdeveloper 9.0.3.10.35 using Oracle Client 9.2.0.1.0.
package mypackage3;
import sqlj.runtime.*;
import sqlj.runtime.ref.*;
import java.sql.*;
import oracle.sqlj.runtime.*;
import sqlj.runtime.ref.DefaultContext;
public class connTest
public connTest()
public static void main(String[] args) throws InterruptedException
Date currentDateTime;
while (true) {
try {
Oracle.connect("jdbc:oracle:oci8:@dbname", "user", "passwd", false);
#sql {select sysdate into :currentDateTime from dual};
catch (SQLException se) {
System.out.println(se);
try {
Oracle.close(DefaultContext.CLOSE_CONNECTION);
Oracle.connect("jdbc:oracle:oci8:@dbname", "user", "passwd", false);
catch (SQLException se) {
System.out.println(se);
Thread.sleep(5000);
}

I'm checking the handle count for the jvm running the program in Task Manager.
I expect the Oracle.close to clean up so that all resources used by the connection being closed are made available for garbage collection. Also there's no memory leaking I can see - just the handles. I've also tried a code variation that allocates a new defaultContext then after the close sets it to null. That doesn't seem to make any difference. I'll try running that in a 1.4 jvm and see if I can force garbage collection. I suspect that the handle's allocated on the connect aren't being closed in windows land on the Oracle.close. I wouldn't expect the garbage collecter to actually know that the contents of memory are a window's handle and that when that memory is garbage collected a windows call must be made to close the handle.

Camera Eventually stops connecting possibly caused by a handle leak

Can somebody tell me how to write an app that display a picture of the webcam on screen, change the size of video shown and remove it from the screen without the camera eventually not displaying and the created handles being left behind.
From my investigation any camera with the usbvideo.sys driver is affected, which will be at least 50% of webcams out there.
Sometimes air locks up and becomes unresponsive / sometimes it just stops displaying the camera, it depends upon the camera.
Tested with lots of different cameras on Windows 7 and 8 with lots of versions of the Air/Flex Frameworks.
Heres a simple app to test it.
<?xml version="1.0" encoding="utf-8"?>
<s:WindowedApplication xmlns:fx="http://ns.adobe.com/mxml/2009"
    xmlns:s="library://ns.adobe.com/flex/spark"
    xmlns:mx="library://ns.adobe.com/flex/mx"
    creationComplete="windowedapplication1_creationCompleteHandler(event)">
<fx:Script>
<![CDATA[
import mx.collections.ArrayList;
import mx.events.FlexEvent;
import spark.events.IndexChangeEvent;
private var camera:Camera;
[Bindable]
private var cams:ArrayList;
private var video:Video;
[Bindable]
private var autoInProgress:Boolean;
[Bindable]
private var totalAttempts:int = 0;
private var currentAttempts:int = 0;
protected function windowedapplication1_creationCompleteHandler(event:FlexEvent):void
cams = new ArrayList(Camera.names);
protected function selectedCamera_changeHandler(event:IndexChangeEvent):void
camera = Camera.getCamera(selectedCamera.selectedIndex.toString());
if (camera)
camera.setMode(640, 480, 30);
private function start() : void {
currentAttempts = 0;
autoInProgress = true;
if (resizeTest.selected) {
addVideoAndAttachCamera();
resize();
else {
attachDetach();
private function addVideoAndAttachCamera() : void {
if (camera) {
video = new Video(camera.width, camera.height);
videoContainer.addChild(video);
video.attachCamera(camera);
private function detachCameraAndRemoveVideo() : void {
video.attachCamera(null);
video.clear();
videoContainer.removeChild(video);
video = null;
private function attachDetach() : void {
++ currentAttempts;
++ totalAttempts;
if (camera) {
addVideoAndAttachCamera();
memoryUsage.text = "System Memory Usage: " + (System.totalMemory).toString() + "bytes";
setTimeout(function():void {
detachCameraAndRemoveVideo();
if (currentAttempts < int(attempts.selectedItem)) {
attachDetach();
else {
autoInProgress = false;
}, int(delay.selectedItem));
private function resize() : void {
++ currentAttempts;
++ totalAttempts;
if (camera) {
camera.setMode(640, 480, 30);
memoryUsage.text = "System Memory Usage: " + (System.totalMemory).toString() + "bytes";
setTimeout(function():void {
if (currentAttempts < int(attempts.selectedItem)) {
resize();
else {
detachCameraAndRemoveVideo();
autoInProgress = false;
}, int(delay.selectedItem));
]]>
</fx:Script>
<s:VGroup>
<s:HGroup>
<s:Label enabled="{!autoInProgress}" text="Camera" />
<s:ComboBox enabled="{!autoInProgress}"
id="selectedCamera"
dataProvider="{cams}"
change="selectedCamera_changeHandler(event)"/>
<s:Label id="memoryUsage" />
<s:Label text="{totalAttempts}" />
</s:HGroup>
<s:HGroup>
<s:Label text="Auto Connect/Disconnect" enabled="{!autoInProgress}" />
<s:ComboBox id="attempts" enabled="{!autoInProgress}" selectedIndex="1">
<mx:ArrayCollection>
<fx:String>1</fx:String>
<fx:String>5</fx:String>
<fx:String>10</fx:String>
<fx:String>50</fx:String>
<fx:String>75</fx:String>
<fx:String>100</fx:String>
<fx:String>500</fx:String>
<fx:String>1000</fx:String>
<fx:String>5000</fx:String>
<fx:String>10000</fx:String>
</mx:ArrayCollection>
</s:ComboBox>
<s:Label text="times" enabled="{!autoInProgress}" />
<s:CheckBox id="resizeTest" label="Resize Test?" />
<s:Button enabled="{!autoInProgress}" click="start()" label="Start" />
</s:HGroup>
<s:HGroup>
<s:Label text="Delay" enabled="{!autoInProgress}" />
<s:ComboBox id="delay" enabled="{!autoInProgress}" selectedIndex="1">
<mx:ArrayCollection>
<fx:String>1000</fx:String>
<fx:String>1500</fx:String>
<fx:String>2000</fx:String>
<fx:String>3000</fx:String>
</mx:ArrayCollection>
</s:ComboBox>
</s:HGroup>
<mx:UIComponent id="videoContainer" width="640" height="480" />
</s:VGroup>
</s:WindowedApplication>
The resizeTest checkbox shows that you can make the camera lockup just by repetitively calling cam.setMode().
I have submitted a bug into the bugbase. Bug#3850401 - Handle leak with video.attachCamera leading to inoperable camera

Avrom,
I have never seeb this error before.
It certainly looks like an OC4J issue. Please try to get an answer on this in the OC4J forum.
Steven Davelaar,
JHeadstart Team.

Overriding windowClosing(Window Event e)???

Hello,
I have a similar question to some already posted regarding closing frames and panels. I am currently writing an application using Java as the interface an Access as the backend. I have the option to exit through a Jmenu. This allows me to prompt the user to save their changes before closing.
My problem is I want the user to have the same option when using the X button in the top right hand corner.
At the minute I am using the code below, which ends the application immediately, without allowing me time to save any changes first.
fl.addWindowListener(new WindowAdapter()
public void windowClosing(WindowEvent e)
System.exit(0);
Can anyone offer me a better solution; I would ideally like to be able to load a JoptionPane with a YES_NO_OPTION to confirm if to save, followed by a second to confirm Exit, which is how the Jmenu option works.
Thanks for any help in advance.
Kris Dowse

What your code actually does: it intercepts the window is closing event, and as soon as it arrives, it kills the Java Virtual Machine (that's what System.exit() does).
Instead of the System.exit() call, you should let your option pane to appear. If it's modal (what I think it is), then I'd say you should run it in another thread, because you're supposed to return from an event handling method as soon as possible. The best is if you have a method which is invoked both from the action listener of the File/Exit menu item, and the window closing listener of the JFrame. This method should create a new thread, doing the work inside, and return immediatelly. If the user (inside the new thread) chooses to cancel the exit, then the thread simply stops, and your application runs. If the user chooses to really exit, then just call the System.exit(), that will kill all the active threads and stop the JVM. This is the behaviour you're seeking for, aren't you?
However, I'd think you also should set the JFrame's setDefaultCloseOperation to DO_NOTHING_ON_CLOSE.

Jvm unnamed windows events handle leak 1.3.1_08-b03 - 1.4.2-b28

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