Memory leak with ThreadStackTrace in libjvm.so (jdk 1.5.0_11)

I posted this initially in "Desktop > Runtime Environment > Java Runtime Environment (JRE)", but am reposting here since this may be a more appropriate place. Here's a link to the original post:
http://forum.java.sun.com/thread.jspa?threadID=5156031&tstart=0
I'm trying to track down the cause of some memory growth in a java application. In my tests, the java heap appears to remain stable, but the overall memory footprint of the jvm process continues to grow (observed with pmap).
I've run my application with libumem and have found what appears to be the culprit, but the memory allocation is in libjvm.so and I'm looking for ideas what might cause it.
uname -a for my host
SunOS thehost 5.10 Generic_118822-18 sun4u sparc SUNW,Netra-440
and I'm using Java 1.5.0_11
Here is the trace from libumem:
1f81c4c0::bufctl_auditADDR BUFADDR TIMESTAMP THREAD
CACHE LASTLOG CONTENTS
1f81c4c0 1f81a470 ac018b4577a0 7
1f43f188 8cda6a4 0
libumem.so.1`umem_cache_alloc+0x210
libumem.so.1`umem_alloc+0x60
libumem.so.1`malloc+0x28
libjvm.so`void*os::malloc+0x28
libjvm.so`void*ResourceObj::operator new+0x38
libjvm.so`ThreadStackTrace::ThreadStackTrace #Nvariant 1+0x34
libjvm.so`void VM_ThreadDump::doit+0xcc
libjvm.so`void VM_Operation::evaluate+0x80
libjvm.so`void VMThread::run+0x6e0
libjvm.so`void*_start+0x208
libc.so.1`_lwp_start
It looks like this leak occurrs when getStackTrace() is called on a Thread.
I've found that the included program will continually allocate memory on the process heap until the JVM cannot allocate memory and it exits with the following exception.
Exception java.lang.OutOfMemoryError: requested 16 bytes for C_Heap: ResourceOBJ. Out of swap space?
import java.lang.StackTraceElement;
import java.lang.Thread;
public class TraceIt {
public static void main(String[] args) {
System.out.println("Starting trace");
int i = 0;
while (true)
if (i%100 == 0) System.out.println(i);
StackTraceElement[] se = Thread.currentThread().getStackTrace();
i++;
} Any ideas what would cause this? Is it a JVM bug?

http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6469701
BTW, when you register to post on this site why isn't Cuba in the list of countries?

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Memory Leak with JPopupMenu

It seems there is a memory leak with JPopupMenu. The following program demonstrates this leak. If you run the program, click on show form, and then close the form, the used memory will be GCd appropriately. If you click on show form, then right click on the table to show the popup (even if you dont do anything else with the popup) then close the form, it never GCs the form. I've tried all kinds of crazy things, but I cant seem to find what is keeping the memory from being GCd.
Peter
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
import java.beans.PropertyChangeListener;
import java.text.DecimalFormat;
import java.util.Timer;
import java.util.TimerTask;
import java.util.Vector;
import javax.swing.AbstractAction;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JPopupMenu;
import javax.swing.JRadioButtonMenuItem;
import javax.swing.JScrollPane;
import javax.swing.JTabbedPane;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
import javax.swing.table.AbstractTableModel;
@SuppressWarnings("serial")
public class TriState extends JPanel {
     private static final long               K               = 1024;
     private static final long               M               = K * K;
     private static final long               G               = M * K;
     private static final long               T               = G * K;
     protected static int ctr = 1;
     private JButton                              btnShow          = new JButton("Show Form");
     private JLabel                              lblMem          = new JLabel();
     private static final DecimalFormat     df               = new DecimalFormat("#,##0.#");
     protected Timer                              updateTimer     = new Timer();
     public TriState() {
          this.setLayout(new GridLayout());
          add(btnShow);
          add(lblMem);
          updateTimer.scheduleAtFixedRate(new UpdateTimerTask(), 1000, 1000);
          btnShow.addActionListener(new ActionListener() {
               @Override
               public void actionPerformed(ActionEvent e) {
                    FrmReferrals fr = new FrmReferrals();
                    fr.setVisible(true);
     class UpdateTimerTask extends TimerTask {
          public void run() {
               SwingUtilities.invokeLater(new Runnable() {
                    @Override
                    public void run() {
                         dumpMemoryUsage();
     protected void dumpMemoryUsage() {
          System.gc();
          Long t = Runtime.getRuntime().totalMemory();
          long f = Runtime.getRuntime().freeMemory();
          String st = convertToStringRepresentation(t);
          String sf = convertToStringRepresentation(f);
          String su = convertToStringRepresentation(t - f);
          System.out.println("Total:" + st + "(" + t + ") Free:" + sf + "(" + f + ") Used:" + su + "(" + (t - f) + ")");
          lblMem.setText(su + "/" + st);
     public static String convertToStringRepresentation(final long value) {
          final long[] dividers = new long[]{T, G, M, K, 1};
          final String[] units = new String[]{"TB", "GB", "MB", "KB", "B"};
          if (value < 1)
               throw new IllegalArgumentException("Invalid file size: " + value);
          String result = null;
          for (int i = 0; i < dividers.length; i++) {
               final long divider = dividers;
               if (value >= divider) {
                    final double dr = divider > 1 ? (double) value / (double) divider : (double) value;
                    result = df.format(dr) + units[i];
                    break;
          return result;
     private static void createAndShowGUI() {
          JFrame frame = new JFrame("SimpleTableDemo");
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          // Create and set up the content pane.
          TriState newContentPane = new TriState();
          newContentPane.setOpaque(true); // content panes must be opaque
          frame.setContentPane(newContentPane);
          // Display the window.
          frame.pack();
          frame.setVisible(true);
     public static void main(String[] args) {
          javax.swing.SwingUtilities.invokeLater(new Runnable() {
               public void run() {
                    createAndShowGUI();
     protected class PopupMenu extends JPopupMenu {
          public PopupMenu() {
               JRadioButtonMenuItem item1 = new JRadioButtonMenuItem(new AbstractAction("Insert Item") {
                    @Override
                    public void actionPerformed(ActionEvent e) {
                         System.out.println(e.getActionCommand());
               item1.setActionCommand("Insert");
               add(item1);
               JRadioButtonMenuItem item2 = new JRadioButtonMenuItem(new AbstractAction("Delete Item") {
                    @Override
                    public void actionPerformed(ActionEvent e) {
                         System.out.println(e.getActionCommand());
               item2.setActionCommand("Delete");
               add(item2);
     public class FrmReferrals extends JFrame {
          public FrmReferrals() {
               super();
               init();
          protected void init() {
               jbInit();
          protected void closeIt() {
               uninit();
          // variables here
          protected Dimension          dimPreferred     = new Dimension(1270, 995);
          protected JTabbedPane     tabbedPane          = new JTabbedPane();
          protected JTable          tblReferrals     = null;
          protected PopupMenu          popMenu           = new PopupMenu();
          protected void jbInit() {
               setPreferredSize(dimPreferred);
               setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
               setTitle("Referrals");
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               add(pnl);
               pack();
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               ReferralsTableModel ctm = new ReferralsTableModel(buildDummyVector());
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               tblReferrals.setComponentPopupMenu(popMenu);
               tblReferrals.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
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                    @Override
                    public void windowActivated(WindowEvent e) {}
                    @Override
                    public void windowClosed(WindowEvent e) {}
                    @Override
                    public void windowClosing(WindowEvent e) {
                         closeIt();
                    @Override
                    public void windowDeactivated(WindowEvent e) {}
                    @Override
                    public void windowDeiconified(WindowEvent e) {}
                    @Override
                    public void windowIconified(WindowEvent e) {}
                    @Override
                    public void windowOpened(WindowEvent e) {}
          protected Vector<DBO_Referrals> buildDummyVector() {
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               for (int x = 0; x < 5000; x++) {
                    DBO_Referrals r = new DBO_Referrals(x+(5000*ctr));
                    vr.add(r);
               return vr;
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               tblReferrals.setComponentPopupMenu(null);
               for (Component c : popMenu.getComponents()) {
                    PropertyChangeListener[] pl = c.getPropertyChangeListeners();
                    for (PropertyChangeListener l : pl)
                         c.removePropertyChangeListener(l);
                    if (c instanceof JMenuItem) {
                         ActionListener [] al = ((JMenuItem)c).getActionListeners();
                         for (ActionListener l : al) {
                              ((JMenuItem)c).removeActionListener(l);
               popMenu = null;
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               protected long          id;
               protected String     Employee;
               protected String     Rep;
               protected String     Asst;
               protected String     Client;
               protected String     Dates;
               protected String     Status;
               protected String     Home;
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                    this.id = id;
                    Employee = "Employee" + id;
                    Rep = "Rep" + id;
                    Asst = "Asst" + id;
                    Client = "Client" + id;
                    Dates = "Dates" + id;
                    Status = "Status" + id;
                    Home = "Home" + id;
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                    return id;
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                    return Employee;
               public String getRep() {
                    return Rep;
               public String getAsst() {
                    return Asst;
               public String getClient() {
                    return Client;
               public String getDates() {
                    return Dates;
               public String getStatus() {
                    return Status;
               public String getHome() {
                    return Home;
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                    super();
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                    this();
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               @Override
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                    switch (col) {
                         case 0 :
                              return Long.class;
                         default :
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               @Override
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                    return sColumns.length;
               @Override
               public int getRowCount() {
                    return data.size();
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                    if (row > data.size())
                         return null;
                    DBO_Referrals a = data.get(row);
                    switch (col) {
                         case 0 :
                              return a.getId();
                         case 1 :
                              return a.getEmployee();
                         case 2 :
                              return a.getRep();
                         case 3 :
                              return a.getAsst();
                         case 4 :
                              return a.getClient();
                         case 5 :
                              return a.getDates();
                         case 6 :
                              return a.getStatus();
                         case 7 :
                              return a.getHome();
                         case 8 :
                              return "+";
                         default :
                              return null;

BTW instead of continually printing out the memory use a profiler (jvisualvm in the jdk/bin directory -> heapdump -> search on your class -> view in instances -> find nearest GC root).
Looks like BasicPopupMenuUI doesn't remove a reference to the JRootPane immediately. As far as I can see it will be removed when another menu shows.
As a hackish workaround you can try this in you FrmReferrals#uninit():
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                if (listener.getClass().getName().contains("MenuKeyboardHelper")) {
                    try {
                        Field field = listener.getClass().getDeclaredField("menuInputMap");
                        field.setAccessible(true);
                        field.set(listener, null);
                    } catch (Exception e) {
                        // ignored
                    break;
            }Funnily enough though it isn't there when I reduce your code to a SSCCE:
import java.awt.*;
import javax.swing.*;
public class TestBasicPopupMenuUILeak extends JFrame {
    public TestBasicPopupMenuUILeak() {
        super("Not collected right away");
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                JFrame frame = new JFrame("Test");
                frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
                frame.getContentPane().add(
                        new JButton(new AbstractAction("Show frame") {
                            @Override
                            public void actionPerformed(ActionEvent e) {
                                EventQueue.invokeLater(new Runnable() {
                                    public void run() {
                                        JLabel label = new JLabel(
"Right click to show popup, then close this frame."
+ "The frame with not be GCed until another (popup) menu is shown.");
                                        JPopupMenu popup = new JPopupMenu(
                                                "Popup");
                                        popup.add("Item");
                                        label.setComponentPopupMenu(popup);
                                        // named differently so you can find it
                                        // easily in your favorite profiler
                                        JFrame frame = new TestBasicPopupMenuUILeak();
                                        frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
                                        frame.getContentPane().add(label);
                                        frame.pack();
                                        frame.setLocationRelativeTo(null);
                                        frame.setVisible(true);
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
}

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#log information
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>
Is there any other way we can detect memory leak?
>
You have to profile your Application Server like you did with your own code.
regards
slowfly

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I was refering to powersoft.datawindow.DataStore class. Does any body here has worked on these?
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try increasing your virtual memory on your NT system...
"Parasher K. Joshi" <[email protected]> wrote:
>
Hi,
I observed the same confusing stuff in my tests. But I run weblogic 4.5.1 on Windows NT with JDK 1.2.2-w
Usually, I would get a "Low virtual memory" message from windows
and if I click ok & shuffle thourgh my windows I would be ok.
But since last 2 days, I would keep the server running overnight.
When I return in morning,
I would find a "Low virtual memory" message and
on clicking OK. I would find another message tell me that java.exe (which was running weblogic) crashed!!
Now today I tried to watch the memory usage in Task Manager. And I found the most wierd thing.
I saw that even when the system was doing virtually nothing,
except print a string at intervals, the memory usage would go
up steadyly.
Even doing a forced finalization and gc did not seem to stop it.
BUT, BY CHANCE I HAPPEN TO MINIMISE AND MAXIMISE THE WEBLOGIC
CONSOLE OUTPUT WINDOW.
WHAT I SAW IN THE TASK MANAGER AMAZED ME!
THE MEMORY USAGE IN TASK MANAGER HAD GONE DOWN TO 24XXKB, WHILE
IT WAS ABOUT 20000K OR EVEN MORE.
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get the "low virtual memory" message and if OKed it and shuffled
though application windows (maybe minimise, maximise the weblogic
console output window in process), I would be able to complete
my application. But when the message appears during night runs,
nothing is done and by morning, when I reach to work,
I would see that weblogic had crashed!!
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Parasher
Mark Evans <[email protected]> wrote:
Hi,
We are currently running a Java Application using RMI/Weblogic 4.5.1/Solaris 5.7/Java 1.22.
Behavior that has been observered during the day is that memory usage reaches a stage in which it begins increasing and GC doesn't recover any memory, until the heap reaches an extremly large size, then recovers a significant amount of memory.
We have even seen the java process grab more memory than specified in the -Xmx parameter and experience a java.lang.OutOfMemory error.
I have seen postings that describe similar issues in this newsgroup, but none that define a solution.
This problem is intermittent, and our application can run an entire day without experiencing this memory leak. On the other hand there are days when the memory leak occurrs even when the system is idle overnight.
Please let me know any information you have gathered on this subject.
Regards,
Mark Evans

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Hello all,
Not sure if this is the right place to post this but here goes. I have a program that needs to change the font of at least 250,000 letters, however after doing this the program runs slow and laggy as if changing the fonts of each letter took up memory and never released it? Here is a compilable example, Click the button at the bottom of the window and watch the letter it is currently working on. You will notice that around 200,000 it will begin to not smoothly count up anymore but count in kind of a skipping pattern. This seems to get worse the more you do it and seems to indicate to me that something is using memory and not releasing it. I'm not sure why replacing a letter's font with a new font would cause more memory to be taken up I would think if I was doing it properly it would simply replace the old font with the new one not taking anymore memory then it did before. Here is the example: This program sometimes locks up so be prepared. If someone could maybe point out what is causing this to take up more memory after changing the fonts that would be great and hopefully find a solution :) Thanks in advance.
-neptune692
* To change this template, choose Tools | Templates
* and open the template in the editor.
package paintsurface;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
import java.util.List;
public class PaintSurface implements Runnable, ActionListener {
public static void main(String[] args) {
        SwingUtilities.invokeLater(new PaintSurface());
List<StringState> states = new ArrayList<StringState>();
Tableaux tableaux;
Random random = new Random();
Font font = new Font("Arial",Font.PLAIN,15);
//        Point mouselocation = new Point(0,0);
static final int WIDTH = 1000;
static final int HEIGHT = 1000;
JFrame frame = new JFrame();
JButton add;
public void run() {
        tableaux = new Tableaux();
        for (int i=250000; --i>=0;)
                addRandom();
        frame.add(tableaux, BorderLayout.CENTER);
        add = new JButton("Change Font of letters - memory leak?");
        add.addActionListener(this);
        frame.add(add, BorderLayout.SOUTH);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(WIDTH, HEIGHT);
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
public void actionPerformed(ActionEvent e) {
    new Thread(new ChangeFonts()).start();
void addRandom() {
        tableaux.add(
                        Character.toString((char)('a'+random.nextInt(26))),
                        UIManager.getFont("Button.font"),
                        random.nextInt(WIDTH), random.nextInt(HEIGHT));
//THIS CLASS SEEMS TO HAVE SOME KIND OF MEMORY LEAK I'M NOT SURE?
class ChangeFonts implements Runnable {
    public void run() {
    Random rand = new Random();
        for(int i = 0; i<states.size(); i++) {
            font = new Font("Arial",Font.PLAIN,rand.nextInt(50));
            states.get(i).font = font;
            add.setText("Working on letter - "+i);
class StringState extends Rectangle {
        StringState(String str, Font font, int x, int y, int w, int h) {
                super(x, y, w, h);
                string = str;
                this.font = font;
        String string;
        Font font;
class Tableaux extends JComponent {
        Tableaux() {
                this.enableEvents(MouseEvent.MOUSE_MOTION_EVENT_MASK);
                lagState = createState("Lag", new Font("Arial",Font.BOLD,20), 0, 0);
        protected void processMouseMotionEvent(MouseEvent e) {
                repaint(lagState);
                lagState.setLocation(e.getX(), e.getY());
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                super.processMouseMotionEvent(e);
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        StringState createState(String str, Font font, int x, int y) {
            FontMetrics metrics = getFontMetrics(font);
            int w = metrics.stringWidth(str);
            int h = metrics.getHeight();
            return new StringState(str, font, x, y-metrics.getAscent(), w, h);
        public void add(String str, Font font, int x, int y) {
                StringState state = createState(str, font, x, y);
                states.add(state);
                repaint(state);
        protected void paintComponent(Graphics g) {
                Rectangle clip = g.getClipBounds();
                FontMetrics metrics = g.getFontMetrics();
                for (StringState state : states) {
                        if (state.intersects(clip)) {
                                if (!state.font.equals(g.getFont())) {
                                        g.setFont(state.font);
                                        metrics = g.getFontMetrics();
                                g.drawString(state.string, state.x, state.y+metrics.getAscent());
                if (lagState.intersects(clip)) {
                g.setColor(Color.red);
                if (!lagState.font.equals(g.getFont())) {
                    g.setFont(lagState.font);
                    metrics = g.getFontMetrics();
                g.drawString("Lag", lagState.x, lagState.y+metrics.getAscent());
}Here is the block of code that I think is causing the problem:
//THIS CLASS SEEMS TO HAVE SOME KIND OF MEMORY LEAK I'M NOT SURE?
class ChangeFonts implements Runnable {
    public void run() {
    Random rand = new Random();
        for(int i = 0; i<states.size(); i++) {
            font = new Font("Arial",Font.PLAIN,rand.nextInt(50));
            states.get(i).font = font; // this line seems to cause the problem?
            add.setText("Working on letter - "+i);
}

neptune692 wrote:
jverd wrote:
You're creating a quarter million distinct Font objects, and obviously you must be hanging on to all of them because each character is having its font set to the newly created object. So if you have 250k chars, you're forcing it to have 250k Font objects.
Since the only difference is that rand.nextInt(50) parameter, just pre-create 50 Font objects with 0..49, stick 'em in the corresponding elements in an array, and use rand.nextInt to select the Font object to use.That does make sense but it does that when the the program is first launched and doesn't lag. But the second and third time you change the letters font it seems to lag so if it wasn't taking up more memory the second time it should perform like it did when it first launched. I don't care to investigate any further. The real problem is almost certainly the quarter million Font objects. It could be that 250k is fine, but by the time you get to 500k, it has to do a lot of GC, and that's where the slow down is coming. You might even be able to make it work better with the code you have just by tweaking the GC parameters at startup, but I wouldn't bother. Fix the code first, and then see if you have issues.
Does creating a new font for each of those letters not replace the old font object? If it didn't use more memory the second and third time I don't think you would see the skipping in the counter and the slowing down of the iterations. So it must be remembering some of the old font objects or am I wrong?Using new always creates a new object. When you do it the second time around, and call letter.setFont(newFont), the old Font object is eligible for GC. That doesn't mean it will be GCed right away though. The JVM can leave them all laying around until it runs out of memory, and then GC some or all of them.

Memory leak with CGImageSourceCreateThumbnailAtIndex

After creating a thumbnail with CGImageSourceCreateThumbnailAtIndex, CGImageRelease doesn't seem to work!? I am rendering full-size thumbnails of PDF pages, and this just leaks memory:
void memLeakTest(CFStringRef sourcePath) {
printf("Running memLeakTest...
CFURLRef url = CFURLCreateWithString(NULL, sourcePath, NULL);
CGImageSourceRef imageSource = CGImageSourceCreateWithURL(url, NULL);
CFStringRef keys[3];
CFTypeRef values[3];
int n=0;
keys[n] = kCGImageSourceCreateThumbnailFromImageAlways;
values[n++] = kCFBooleanTrue; //If I set this to false, there is no leak, but I need the thumbnails
keys[n] = kCGImageSourceCreateThumbnailWithTransform;
values[n++] = kCFBooleanTrue;
keys[n] = kCGImageSourceShouldCache;
values[n++] = kCFBooleanFalse;
CFDictionaryRef options;
options = CFDictionaryCreate(kCFAllocatorDefault, (const void **)keys, values, n, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
CGImageRef image = CGImageSourceCreateThumbnailAtIndex(imageSource, 0, options);
CFRelease( imageSource );
CGImageRelease( image ); //Doesn't seem to have any effect. Memory continues to balloon.
CFRelease( url );
int main (int argc, const char * argv[]) {
CFStringRef pathUrl = CFSTR("file:/path/to/a/big.pdf");
while( true ) {
memLeakTest( pathUrl );
if( n < maxPages ) sleep(5); //Wait 5 seconds
return 0;

I was able to fix the memory leak using the following code:
void memLeakTest(CFStringRef sourcePath) {
printf("Running memLeakTest...
CFURLRef url = CFURLCreateWithString(NULL, sourcePath, NULL);
CFStringRef keys[10];
CFTypeRef values[10];
int n=0;
//keys[n] = kCGImageSourceCreateThumbnailFromImageIfAbsent;
//values[n++] = kCFBooleanTrue;
keys[n] = kCGImageSourceCreateThumbnailFromImageAlways;
values[n++] = kCFBooleanTrue;
keys[n] = kCGImageSourceCreateThumbnailWithTransform;
values[n++] = kCFBooleanTrue;
keys[n] = kCGImageSourceShouldCache;
values[n++] = kCFBooleanFalse;
CFDictionaryRef options;
options = CFDictionaryCreate(kCFAllocatorDefault, (const void **)keys, values, n,
&kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);
//CGImageSourceRef imageSource = CGImageSourceCreateWithURL(url, options);
NSImage* imageFile = [[NSImage alloc] initByReferencingURL: (NSURL *)url];
NSData * data = [imageFile TIFFRepresentation];
CGImageSourceRef imageSource = CGImageSourceCreateWithData((CFDataRef)data, options);
CGImageRef image = CGImageSourceCreateThumbnailAtIndex(imageSource, 0, options);
CFRelease( image );
CFRelease( imageSource );
[imageFile release];
CFRelease( options );
CFRelease( url );
There are a number of different graphics APIs you could use. I'm no expert in any of them, so I used the simple ones. The above code requires both Objective-C and an autorelease pool, but I'm sure you could use different functions to remove those requirements.

Memory Leak with 10.6.4

This is very unusual for my Mab Desktops to do, but all I can figure is that there is a memory leak in the latest update 10.6.4 and that it is effecting everything.
I ran a few apps on Friday night, closed then down but left the computer running. This morning, I tried the same apps and they would'nt load. I had to restart the computer to get them to work. The same thing happened on Thursday. I've fixed permissions so I can rule that out, unless of course it's the RAM it's self but I've ran tests on that and the software says that it's ok.
Any suggestions would be appreciated on this subject.

Can you open them, close them, and then immediately reopen them?
Are they crashing or just bouncing in the Dock and never opening?
Open Console and scroll down the log list and look for Diagnostic Reports. See if there are any logs related to the apps or the times the programs didn't open. There are a few sections with Diagnostic Reports. If they full up crash, there should be something under CrashReporter.

Memory leak with CursoredStream

I want, first, to write a large collection of data in a file, and second, remove all these data.
I use CursoredStream to manage them.
I first use mark() method before iterate throw values with
while (hasMoreElements()) { nextElement(); }
loop, and second use reset() method to move back to first row before iterate again.
I can only use releasePrevious() method in the second iteration to avoid memory leak. But the first iteration creates objects that are not released.
If I use this method in the first iteration, I can't iterate the second times.
Is it a bug?
Is there a way to destroy all the created objects?

Once you call releasePrevious() those objects are released and can only be accessed from a new query.
What is the IdentityMap type you have set in your project for the class you are reading and the related classes, if the class has no reference to it (from other classes) you will want to use no-identity map. If there are references then you will want to use WeakIdentityMap.
The second time you iterate through the Cursor you will be retrieving the same instance of objects as the first time, no extra memory will be used.
--Gordon

Memory leak with variant/OCX

I'm trying to get images from an IP webcam thanks to an ActiveX and process them with IMAQ.
This ActiveX needs a variant to put chars from the image. It seems to work fine, (nearly 'in real-time') when I convert a string into a variant. Nevertheless, I have memory leak, if I put this sub-VI into a while loop.
So, rather than using a string conversion, I've tried to use a Uchar array conversion. It also seems to work but it is really slow and in this case I don't have any leak of memory !
I'm likely misunderstand the memory managment of Labview.
Thank you very much for your help.

Sorry for the VIs I've sent.
Here are simplified VIs, with comments that illustrate the problem.
I hope this will bring you clearer informations.
Olivier M.
Attachments:
test_snap.vi ‏57 KB
InitAxis.vi ‏36 KB
SnapAxis.vi ‏38 KB

Memory Leak with Weblogic 6.1

Hello everyone.
I need some help with a problem we are having with our application. It consists on Servlets, JMS with MDBs, Xml parsing...
Our application dequeues messages from an Oracle Queue and sends xml-text message to a servlet. It also receives xml-text and enqueues objects in an Oracle Queue.
And it also has access to Oracle Database (context tables, etc).
We are doing everything on Tru64 Unix (and our tests on Win 2000) and we are using WebLogic 6.1.
Our problem is that we have found that it seems that the garbage collector is not running well. I mean, with the time our system is degrading. The memory use increases. It seems to be a memory leak.
We have used a testing tool, OptimizeIt, and we have found that there are
objects that are increasing the use of memory. If we use the option 'java -verbose' we find that it seems to be Hash objects (HashMap, Hashtable) which are increasing the use of memory. In our code we are not using any hashtable nor any class that extends from it (we have deleted everyone).
Can it be due to a problem with WebLogic? A problem with JMS, queues, etc? A problem with JNDI?
Could anybody please help us?
Thanks in advanced.

Yes, we see that there are some entries of the type:
java/util/Hahstable$Entry
java/util/Hahstable
weblogic/jndi/Environment
This entries keep growing and growing with the time.
We have deleted all the Hashtable, Properties and all the kind of Collection objects. I guess WebLogic is using this objects in order to arrange our application runs.
Am I right? Do you know if we can do anything?
Thank you.

Memory leak with ThreadStackTrace in libjvm.so (jdk 1.5.0_11)

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