Memory Leak with 4.5.1/Java/Solaris

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

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.
This seems to support the fact that during my test, I would
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!!
You may try that and see if it helps you.
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

Similar Messages

  • Memory leak in WLS6.1 sp3 on Solaris?

    We are running WLS 6.1 sp3 on Solaris 8 using Sun's 1.3.1 JVM with BEA's
    JDriver to connect to Oracle (8.1.7). We have set the JVM to a maximum heap
    of 512M (-Xms256m -Xmx512m).
    The issue is that we are now seeing (via pmap) the resident memory growing
    to ~1GB. Yet, the WLS management console is reporting memory usage of ~200M.
    So, if we are to believe WLS, then the JVM (or some native library) is
    chewing up the extra memory.
    Having examined the results of "pmap -x <pid>", I see the heap (and some
    anon) mem/file are quite large.
    Address Kbytes Resident Shared Private Permissions Mapped File
    00026000 418912 416096 - 416096 read/write/exec [ heap ]
    D8C00000 524288 447928 - 447928 read/write/exec [ anon ]
    total Kb 1083832 981136 37960 943176
    Questions:
    - Are there any known memory leaks with 6.1 sp3 on Solaris?
    - Should it be possible for pmap's value of "heap" to grow larger than the
    "Xms" setting? We have observed this recently, but the numbers above don't
    reflect this.
    - Any idea what the "anon" is or how to determine what it is?
    - Do you know of any tools that might help me determine what is using that
    memory or what is in it?
    Any suggestions will be greatly appreciated...
    Thanks in advance,
    Erik

    If you set -Xmx512m then the java heap will grow no larger than 512MB.
    WLS is reporting the size of the java heap. (It is a java program after
    all and doesn't know a lot about what native code might be doing.)
    My first thought is try running with Oracle's thin (type-4) driver.
    Since this is java code, it will use the java heap. If the memory usage
    drastically changes, then you can point the finger at the jDriver.
    Are you using any other native code / libraries?
    -- Rob
    Erik Westland wrote:
    We are running WLS 6.1 sp3 on Solaris 8 using Sun's 1.3.1 JVM with BEA's
    JDriver to connect to Oracle (8.1.7). We have set the JVM to a maximum
    heap
    of 512M (-Xms256m -Xmx512m).
    The issue is that we are now seeing (via pmap) the resident memory growing
    to ~1GB. Yet, the WLS management console is reporting memory usage of
    ~200M.
    So, if we are to believe WLS, then the JVM (or some native library) is
    chewing up the extra memory.
    Having examined the results of "pmap -x ", I see the heap (and some
    anon) mem/file are quite large.
    Address Kbytes Resident Shared Private Permissions Mapped File
    00026000 418912 416096 - 416096 read/write/exec [ heap ]
    D8C00000 524288 447928 - 447928 read/write/exec [ anon ]
    total Kb 1083832 981136 37960 943176
    Questions:
    - Are there any known memory leaks with 6.1 sp3 on Solaris?
    - Should it be possible for pmap's value of "heap" to grow larger than the
    "Xms" setting? We have observed this recently, but the numbers above don't
    reflect this.
    - Any idea what the "anon" is or how to determine what it is?
    - Do you know of any tools that might help me determine what is using that
    memory or what is in it?
    Any suggestions will be greatly appreciated...
    Thanks in advance,
    Erik

  • Memory leak with 1.6.0_07 in applet using Swing

    Java Plug-in 1.6.0_07
    Using JRE version 1.6.0_07 Java HotSpot(TM) Client VM
    Windows XP - SP2
    I have a commercial application that has developed a memory leak with the introduction of the latest plugin. The applets chew up memory and eventually freeze. They did not before. Using jvisualm I see a build up of native arrays, primarily int[][] and char[]. I'm still investigating. Anyone have a similar experience?
    The Applet uses a swing interface, uses buffered images and swing timers, and regularly performs http connections to the server which result in actions via the SwingUtil.invokeLater() method.

    I am Using Internet Explorer Browser Version 6.0.Huge security hole.
    Its not throwing Error / Exception Wrap a try/catch at the highest level possible.
    Catch 'Throwable'. And log/display it somewhere.

  • 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");
                   JPanel pnl = new JPanel();
                   pnl.setOpaque(false);
                   pnl.setLayout(new BorderLayout());
                   pnl.add(tabbedPane, BorderLayout.CENTER);
                   // put it all in the frame
                   add(pnl);
                   pack();
                   setLocationRelativeTo(null);
                   // init the table and model
                   ReferralsTableModel ctm = new ReferralsTableModel(buildDummyVector());
                   tblReferrals = new JTable(ctm);
                   tblReferrals.setComponentPopupMenu(popMenu);
                   tblReferrals.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
                   tabbedPane.add(new JScrollPane(tblReferrals, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED, JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED));
                   addWindowListener(new WindowListener() {
                        @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() {
                   Vector<DBO_Referrals> vr = new Vector<DBO_Referrals>();
                   for (int x = 0; x < 5000; x++) {
                        DBO_Referrals r = new DBO_Referrals(x+(5000*ctr));
                        vr.add(r);
                   return vr;
              protected void uninit() {
                   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;
              protected class DBO_Referrals {
                   protected long          id;
                   protected String     Employee;
                   protected String     Rep;
                   protected String     Asst;
                   protected String     Client;
                   protected String     Dates;
                   protected String     Status;
                   protected String     Home;
                   public DBO_Referrals(long id) {
                        this.id = id;
                        Employee = "Employee" + id;
                        Rep = "Rep" + id;
                        Asst = "Asst" + id;
                        Client = "Client" + id;
                        Dates = "Dates" + id;
                        Status = "Status" + id;
                        Home = "Home" + id;
                   public long getId() {
                        return id;
                   public String getEmployee() {
                        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;
              public class ReferralsTableModel extends AbstractTableModel {
                   protected Vector<DBO_Referrals>          data          = new Vector<DBO_Referrals>();
                   protected String[]                         sColumns     = {"id", "Employee", "Rep", "Assistant", "Client", "Date", "Status", "Home", "R"};
                   public ReferralsTableModel() {
                        super();
                   public ReferralsTableModel(Vector<DBO_Referrals> data) {
                        this();
                        this.data = data;
                   @SuppressWarnings("unchecked")
                   @Override
                   public Class getColumnClass(int col) {
                        switch (col) {
                             case 0 :
                                  return Long.class;
                             default :
                                  return String.class;
                   @Override
                   public int getColumnCount() {
                        return sColumns.length;
                   @Override
                   public int getRowCount() {
                        return data.size();
                   @Override
                   public Object getValueAt(int row, int col) {
                        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():
                for(ChangeListener listener : MenuSelectionManager.defaultManager().getChangeListeners()) {
                    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);
    }

  • Memory leaks with Third party classes

    Hello all,
    This is fairly known problem. But I guess, my problem gives a new dimention to the problem.
    I have an application which is developed by me. This application ideally needed to use third party classes ( obviously no source code is supplied ). These third party classes provide extra functionality required.
    The problem is, when I don't use third party classes in my application, every thing is fine. When I include third party classes, I am having memory leaks.
    Then I tried to investigate memory leaks with Optimizeit tool. It is new to me. As of now, I understood, we can identify where the memory leaks are occuring.
    finally the problem is, in order to solve this, I need some patches in the code. But I don't have source code for those classes. How to solve this problem?
    For example,
    I use a third party classes in my code like this,
    ThirdPartyMemoryLeakClass obj = new ThirdPartyMemoryLeakClass();
    This 'obj' is made static, as it takes lot of time to create this object. Obviously this object contains several references to other objects, which I can't control.
    In the process of reusing this object, I am getting memory leaks.
    Any ideas regarding, how one has to deal this type of situations? What are the issues involved with this case? Are there any similar problems, which have been solved? are most welcome.
    many thanks for your time.
    Madhav

    Decompile it using jad. Find leak.Yes, I too got the idea and tried to decompile those classes and recompile. I had some problems while recompiling. Is this is the only way to get rid of this problem?
    I was refering to powersoft.datawindow.DataStore class. Does any body here has worked on these?
    Can you suggest me how to find the memory leak causes? if you were needed to find out memory leak causes, what would be your approach?
    Madhav

  • Memory leak with UI automation

    Hi, 
    I noticed there is memory leak with UI automation in my window 8.1.
    I noticed there is solution for window 8
    http://support.microsoft.com/kb/2885482
    Is there any solution for window 8.1?
    I really appreciate for any help.

    Hi,
    I'm sorry for didn't hear anything about this issue. I'll try to connect the writer of this KB, hope we can find some suggestion. If there is any progress about this problem, I would come back.
    Roger Lu
    TechNet Community Support

  • How to root out memory leak with  Java JNI & Native BDB 11g ?

    We are testing a web application using the 32-bit compiled native 11g version of BDB (with replication) under 32-bit IBM 1.5 JVM via JNI under 64-bit RedHat Linux. We are experiencing what appears to be a memory leak without a commensurate increase in Java heap size. Basically the process size continues to grow until the max 32-process size is reached (4Gb) and eventually stops running (no core). Java heap is set to 2Gb min/max. GCs are nominal, so the leak appears to be native and outside Java bytecode.
    We need to determine whether there is a memory leak in BDB, or the IBM JVM or simply a mis-use of BDB in the Java code. What tools/instrumentation/db statistic should be used to help get to root cause? Do you recommend using System Tap (with some particular text command script)? What DB stats should we capture to get to the bottom of this memory leak? What troubleshooting steps can you recommend?
    Thanks ahead of time.
    JE.
    Edited by: 787930 on Aug 12, 2010 5:42 PM

    That's troublesome... DB itself doesn't have stats that track VM in any useful way. I am not familiar with SystemTap but a quick look at it seems to imply that it's better for kernel monitoring than user space. It's pretty hard to get DB to leak significant amounts of memory. The reason is that it mostly uses shared memory carved from the environment. Also if you are neglecting to close or delete some object DB generally complains about it somewhere.
    I don't see how pmap would help if it's a heap leak but maybe I'm missing something.
    One way to rule DB out is to replace its internal memory allocation functions with your own that are instrumented to track how much VM has been allocated (and freed). This is very easy to do using the interfaces:
    db_env_set_func_malloc()
    db_env_set_func_free()
    These are global to your process and your functions will be used where DB would otherwise call malloc() and free(). How you get usage information out of the system is an exercise left to the reader :-) If it turns out DB is the culprit then there is more thinking to do to isolate the problem.
    Other ideas that can provide information if not actual smoking guns:
    -- accelerate reproduction of the problem by allocating nearly all of the VM to the JVM and the DB cache (or otherwise limit the allowable VM in your process)
    -- change the VM allocated to the JVM in various ways
    Regards,
    George

  • Memory Leak with JDialog in Java 1.4.2_07

    Hello!
    All books I have read say to close a JDialog, it is enough to call the Method "dispose". Now I have written my first applikation an with every Dialog I open, the Software needs more RAM. With every Dialog I open, my software needs 1,5 MB RAM.
    I can`t reuse the Dialogs, because the user needs to look at view at the same time
    The Question is, how to close a JDialog correct that the GC can clean all Objects in RAM.
    Here are my Example Programm where you can view the differences. I tryed a view things out. With every Dialog the software needs xxx kb of RAM (its only a little example).
    Look at the Task Manager to look the real RAM needage.
    Thanks for Help
    Rainer
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
    import javax.swing.JButton;
    import javax.swing.JFrame;
    import javax.swing.JMenu;
    import javax.swing.JMenuBar;
    import javax.swing.JMenuItem;
    import javax.swing.JPanel;
    public class TestRAMUsage extends JFrame {
         private JPanel jContentPane = null;
         private JMenuBar jJMenuBar = null;
         private JMenu fileMenu = null;
         private JMenuItem exitMenuItem = null;
         private JButton jB_showandclose_normal = null;
         private JButton jB_showandclose_advanced = null;
          * This method initializes jB_showandclose_normal     
          * @return javax.swing.JButton     
         private JButton getJB_showandclose_normal() {
              if (jB_showandclose_normal == null) {
                   jB_showandclose_normal = new JButton();
                   jB_showandclose_normal.setBounds(new java.awt.Rectangle(43,30,214,18));
                   jB_showandclose_normal.setText("open/close Dialog normal x 50");
                   jB_showandclose_normal.addActionListener(new java.awt.event.ActionListener() {
                        public void actionPerformed(java.awt.event.ActionEvent e) {
                             for (int i = 0; i < 50; i++) {
                                  TestDialog td = new TestDialog();
                                  td.show();
                                  td.close_normal();
                             System.gc();
              return jB_showandclose_normal;
          * This method initializes jB_showandclose_advanced     
          * @return javax.swing.JButton     
         private JButton getJB_showandclose_advanced() {
              if (jB_showandclose_advanced == null) {
                   jB_showandclose_advanced = new JButton();
                   jB_showandclose_advanced.setBounds(new java.awt.Rectangle(16,76,260,18));
                   jB_showandclose_advanced.setText("open/close Dialog advanced x 50");
                   jB_showandclose_advanced.addActionListener(new java.awt.event.ActionListener() {
                        public void actionPerformed(java.awt.event.ActionEvent e) {
                             for (int i = 0; i < 50; i++) {
                                  TestDialog td = new TestDialog();
                                  td.show();
                                  td.close_advanced();
                             System.gc();
              return jB_showandclose_advanced;
          * @param args
         public static void main(String[] args) {
              // TODO Auto-generated method stub
              TestRAMUsage application = new TestRAMUsage();
              application.show();
          * This is the default constructor
         public TestRAMUsage() {
              super();
              initialize();
          * This method initializes this
          * @return void
         private void initialize() {
              this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
              this.setJMenuBar(getJJMenuBar());
              this.setSize(300, 200);
              this.setContentPane(getJContentPane());
              this.setTitle("Application");
          * This method initializes jContentPane
          * @return javax.swing.JPanel
         private JPanel getJContentPane() {
              if (jContentPane == null) {
                   jContentPane = new JPanel();
                   jContentPane.setLayout(null);
                   jContentPane.add(getJB_showandclose_normal(), null);
                   jContentPane.add(getJB_showandclose_advanced(), null);
              return jContentPane;
          * This method initializes jJMenuBar     
          * @return javax.swing.JMenuBar     
         private JMenuBar getJJMenuBar() {
              if (jJMenuBar == null) {
                   jJMenuBar = new JMenuBar();
                   jJMenuBar.add(getFileMenu());
              return jJMenuBar;
          * This method initializes jMenu     
          * @return javax.swing.JMenu     
         private JMenu getFileMenu() {
              if (fileMenu == null) {
                   fileMenu = new JMenu();
                   fileMenu.setText("File");
                   fileMenu.add(getExitMenuItem());
              return fileMenu;
          * This method initializes jMenuItem     
          * @return javax.swing.JMenuItem     
         private JMenuItem getExitMenuItem() {
              if (exitMenuItem == null) {
                   exitMenuItem = new JMenuItem();
                   exitMenuItem.setText("Exit");
                   exitMenuItem.addActionListener(new ActionListener() {
                        public void actionPerformed(ActionEvent e) {
                             System.exit(0);
              return exitMenuItem;
    import javax.swing.JButton;
    import javax.swing.JDialog;
    import javax.swing.JPanel;
    import javax.swing.JTextField;
    public class TestDialog extends JDialog {
         private static final long serialVersionUID = -4326706771573368209L;
         private JPanel jContentPane = null;
         private JButton jB_drucken = null;
         private JTextField jTF_hallo = null;
         private JButton jB_close = null;
          * This is the default constructor
         public TestDialog() {
              super();
              initialize();
          * This method initializes this
          * @return void
         private void initialize() {
              this.setSize(541, 255);
              this.setTitle("Speicher Dialog");
              this.setContentPane(getJContentPane());
          * This method initializes jContentPane
          * @return javax.swing.JPanel
         private JPanel getJContentPane() {
              if (jContentPane == null) {
                   jContentPane = new JPanel();
                   jContentPane.setLayout(null);
                   jContentPane.add(getJB_drucken(), null);
                   jContentPane.add(getJTF_hallo(), null);
                   jContentPane.add(getJB_close(), null);
              return jContentPane;
          * This method initializes jB_drucken
          * @return javax.swing.JButton
         private JButton getJB_drucken() {
              if (jB_drucken == null) {
                   jB_drucken = new JButton();
                   jB_drucken.setBounds(new java.awt.Rectangle(45, 88, 211, 19));
                   jB_drucken.setText("Sag Hallo Welt");
              return jB_drucken;
          * This method initializes jTF_hallo
          * @return javax.swing.JTextField
         private JTextField getJTF_hallo() {
              if (jTF_hallo == null) {
                   jTF_hallo = new JTextField();
                   jTF_hallo.setBounds(new java.awt.Rectangle(269, 88, 228, 19));
              return jTF_hallo;
          * This method initializes jB_close
          * @return javax.swing.JButton
         private JButton getJB_close() {
              if (jB_close == null) {
                   jB_close = new JButton();
                   jB_close.setBounds(new java.awt.Rectangle(196, 179, 109, 22));
                   jB_close.setText("Schlie�en");
                   jB_close.addActionListener(new java.awt.event.ActionListener() {
                        public void actionPerformed(java.awt.event.ActionEvent e) {
                             try {
                                  // setVisible(false);
                                  dispose();
                                  removeAll();
                                  // getContentPane().removeAll();
                                  // finalize();
                             } catch (Throwable e1) {
                                  // TODO Auto-generated catch block
                                  e1.printStackTrace();
              return jB_close;
          * Dispose the Dialog
         public void close_normal() {
              dispose();
          * Set all Variables to null
          * Remove all Container
          * dispose the Dialog
          * and finalize it!
         public void close_advanced() {
              // System.out.println(this.);
              dispose();
              // show();
              jContentPane = null;
              jB_drucken = null;
              jTF_hallo = null;
              jB_close = null;
              getContentPane().removeAll();
              removeAll();
              try {
                   finalize();
              } catch (Throwable e) {
                   // TODO Auto-generated catch block
                   e.printStackTrace();
    } // @jve:decl-index=0:visual-constraint="10,10"

    I have use Methods in some Software Produkts. But if your Software
    use 30 MB in RAM the Runtime classes say 12 MB used. I don`t think
    that this works hereThe 12 MB is the memory used of the available 30 MB memory available. Once the VM get its memory from the OS, it does not have to return the memory back to the OS right away.
    By calling System.gc() does nt guarentee the garbage collector to be activated right away. you are just asking the garbage collector to run when it get a chance. Since the emeory is not near the max memory available...the gc is likely not going to run. Futhermore, if your application is running..the gc is likely wont run, unless memory is needed when you reach the max limit.
    because the user want to view at more than one Dialog at the same
    timeunderstandable..i just hope the 50 dialogs is just for testing the memory. i can't imagine any user would want to open 50 dialog at the same time =)
    And the other is, that the Variables in the Dialog class wouldn`t clean
    in RAM (that was the reason to set all to null!)why would it not be? When you dispose the dialog, the object will be null out..so when the garbage collector kick in, it will reclaim the memory. Now, if you have references to object in the dialog, that reference will be null out as well..the object may still exist (by having another live object having a reference to it)...the garbage collector would reclaim the dialog memory..but not the "live" object that the dialog has reference to.
    I ran the application..testing both button.
    The top button..there were little memory consumption..the second button consume a little memory bit-by-bit. I see no memory leak here. What happens is you called GC() 50 times..but it will only run one time when it get a chance...by nulling out the variables, and calling finalize()..it actually slow down the garbage collecting...that's why you should not even obther with having those two method. Furthermore, finalize method may not even be called.
    Memory leak occurs when you have a reference from an object still hanging around, but that object is no longer needed. This is a design issue.
    example
    public class A{
        Item item = new Item();
        public void getItem(){ return item; };
    public class B{
        Item item;
        public B(A a){
            item = a.getItem();
    A a = new A();
    B b = new B(a);
    a = null;when a is null out..the item reference is null, but the actual object still exist and 'b' has a reference to it. so by nulling out those object does not mean you just got rid of the object. it's better to let the object scope run out..and the garbage collector to collect it.. When you null out the object, you could accidentally null out an object that some other object may be using.

  • 5.0.2 still MEMORY LEAKS with Java on multiple tabs/windows

    same problem with last update.
    Memory Leaks (upto 2.5 GB) when Java applets load
    in multiple windows/tab.
    Someone also have this problem?
    My other post prior of last update:
    http://discussions.apple.com/message.jspa?messageID=12204453#12204453
    Message was edited by: fascox

    If you want to report this issue to Apple's engineering, send a bug report or an enhancement request via its Bug Reporter system. To do this, join the Mac Developer Program—it's free and available for all Mac users and gets you a look at some development software. Since you already have an Apple username/ID, use that. Once a member, go to Apple BugReporter and file your bug report or enhancement request. The nice thing with this procedure is that you get a response and a follow-up number; thus, starting a dialog with engineering.

  • Memory Leak with new Font()

    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());
                    repaint(lagState);
                    super.processMouseMotionEvent(e);
            StringState lagState;
            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 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 JVM.

    Hi,
    I am getting a jvm Memory Leak when i try to load and parse XMLs. The version of JDK is 1.4.1_05. Has anyone faced this problem?
    Any pointers to this will be very helpful.
    Thanks
    Rajdeep

    There is at least one bug associated with xml (although not because of it) which usually makes an appearance in long running applications.
    http://forum.java.sun.com/thread.jsp?forum=31&thread=351925
    If this is an internal application you could conceivably replace the StringBuffer class yourself to fix this.

  • Memory leak with SystemTray

    Hello,
    I just found a memory leak in my code caused by the SystemTray, but I don't know if that is me that misused SystemTray (I add a trayIcon, then remove it, then add an another one, and so on). I know how to get around that problem, but I don't know the origin of it (my code, java bug ?). So I made the following code reproducing that leak. If someone can give me idea or advice :-)
    class MyThread extends Thread {
      ReferenceQueue<?> referenceQueue;
      public MyThread(ReferenceQueue<?> referenceQueue) {
        this.referenceQueue = referenceQueue;
      @Override
      public void run() {
        System.out.println("Starting ...");
        try {
          while (true) {
            referenceQueue.remove();
            System.out.println("We release a TrayIcon");
        } catch (InterruptedException ex) {
          Logger.getLogger(MyThread.class.getName()).log(Level.SEVERE, null, ex);
    class MyPopup extends PopupMenu {
      static final int MAX = 1000000;
      Integer []toto = new Integer[MAX];
      public MyPopup() {
        for(int i = 0; i < MAX; i++)
          toto[i] = i;
    public class Main {
        public static void main(String[] args) {
          PopupMenu popup;
          ReferenceQueue referenceQueue = new ReferenceQueue();
          Vector<WeakReference>weakReference = new Vector<WeakReference>();
          MyThread myThread = new MyThread(referenceQueue);
          myThread.start();
          SystemTray tray = SystemTray.getSystemTray();
          TrayIcon trayIcon;
          File file = new File(<AN IMAGE HERE>);
          Image image;
          try {
            image = ImageIO.read(file);
            while(true) {
              popup = new PopupMenu();
              trayIcon = new TrayIcon(image, "Frame Title", popup);
              tray.add(trayIcon);
              tray.remove(trayIcon);
              weakReference.add(new WeakReference(trayIcon, referenceQueue));
          } catch (IOException ex) {
            Logger.getLogger(MyJFrame.class.getName()).log(Level.SEVERE, null, ex);
          } catch (AWTException e) {
              Logger.getLogger(MyJFrame.class.getName()).log(Level.SEVERE, null, e);
    }------------------------------------------- ADDED -----------------------------------
    P.S. :
    - the toto array in MyPopup is there in order to obtain quicker a OutOfMemory (OOM)
    - you may change your java parameter by fixing the allowed memory size in order to have a OOM quicker (-Xms30m -Xmx30m)
    - you must have an image in order to test this code (and set the path where <AN IMAGE HERE> is)
    - if you remove the following lines there is no OOM :
    tray.add(trayIcon);
    tray.remove(trayIcon);
    so it seems to me that TrayIcon is the origin of the OOM
    - the weak reference is there in order to see when a trayIcon can be garbage collected
    Edited by: lemmel on May 5, 2009 7:22 AM - added comments

    So I did the test and:
    - you were right about the vector, but this one was added only for debugging purpose (find the OOM cause)
    - your code sample get a OOM with my computer as well as mine (with the vector removed obviously); I made some alteration to your code see below
    could you try changing your java memory settings (see below) ?
    P.S. :
    - I first tried with your code as it was, got the OOM, then decided to give some time to the garbage collector (and later to force a call to it) by adding the lines with the tag ADDED
      import java.awt.*;
      import java.awt.image.BufferedImage;
      static class MyPopup extends PopupMenu {
      public static void main(String[] args) throws Exception{
        SystemTray tray = SystemTray.getSystemTray();
        BufferedImage image = new BufferedImage(16, 16, BufferedImage.TYPE_INT_RGB);
        int i = 0;                       //ADDED
        while (true) {
            PopupMenu popup = new MyPopup();
            TrayIcon newTrayIcon = new TrayIcon(image, "Frame Title", popup);
            tray.add(newTrayIcon);
            tray.remove(newTrayIcon);
            if((i%10)==0) {              //ADDED
              System.gc();               //ADDED
              System.runFinalization();  //ADDED
              Thread.sleep(100);         //ADDED
            }                            //ADDED
            i ++;                        //ADDED
        }I removed the array trick in the MyPopup class in order to be able to do at least one loop (see my settings below)
    - my environnement :
    ---- debian testing, kernel 2.6.26-1-686, libc6 2.9-4
    ---- tried with both java 6.12 and 6.13 (1.6.0_13; Java HotSpot(TM) Client VM 11.3-b02), use Netbeans NetBeans IDE 6.5 (Build 200811100001)
    ---- put those flags: -Xms5m -Xmx5m

  • Memory Leak with Tomcat version update 3.2 to 6.0

    Hi, I've been trying to update tomcat from 3.2 to 6.0. My issue is that I have a memory leak(s?) that make the web application unusable. Currently in my setup I am using these components:
    Tomcat 6.0, sun JDK 1.6.0_01, mssql 2005, Microsoft SQL Server 2005 JDBC Driver 1.2, xalan 2.7.0, log4j 1.0.4 (should be only out of date component)
    It is a fairly large application that uses xslt with xalan and java servlets to display web pages. There was no issue with memory leaks before the update from tomcat 3.2, sun jdk 1.4.2 and old xalan and jdbc (for mssql 2000) components.
    My question for the community is, where should I be looking for my memory leak. Are there known issues with my setup?
    thanks for your help,
    Matt

    Just in case someone goes down the same road as me, my problem was actually the one listed on the page below. My threads are not being released after a StandardContext reload. Which I'm not sure if this leak applies to tomcat version <4 or not.
    http://opensource.atlassian.com/confluence/spring/pages/viewpage.action?pageId=2669

  • Memory leak with jsp and beans

    The application we have created has one particular page that is designed to stay up in the browser and refresh with new information from database queries once every 60 seconds. Running with Tomcat3.2.1 and IE5.5
    The problem is that the memory usage of java.exe continues to grow until the machine crashes from out of memory. It does take more than 24 hours to crash.
    Things I have tried to do to track down the problem or eliminate the problem.
    - I have explicitly set the scope of the beans to "page"
    - I have watched the DatabaseAccess.class (the beans are all extended from this class) and put in code to watch how many instantiations of the class are made and subsequently garbage collected. This appears to be where the memory leak may reside - hundreds of instantiations from some other source than the page I am displaying.
    - the top frame makes database queries for security and display of a menu system dependant upon security clearance. It does not set any time for refresh (refresh == 0). Nor does it explicitly set a scope for the beans.
    - I have run a different jsp engine to see if this was directly related to Tomcat - same problem with resin2.0.0
    The main jsp page that is in the bottom section of the page has the following code:
    ** only the relevant lines are included here
    <%@ include file="../../common.jsp" %>
    <%
         refresh=60;
    %>
    <head>
    <%@ include file="../../meta_head.jsp" %>
    </head>
    <body bgcolor="#FFFFFF" text="#003399" link="#660099" vlink="#990099" alink="#006666" leftmargin="0" topmargin="0" marginwidth="0" marginheight="0">
    <%@ include file="../../access.jsp" %>
    <%@ include file="../../page_title.jsp" %>
    <jsp:useBean id="Line" class="jsp.Line" scope="page" />
    <jsp:useBean id="Machine" class="jsp.Machine" scope="page"/>
    <jsp:useBean id="Alarm_log" class="jsp.Alarm_log" scope="page"/>
    contents of meta_head.jsp
    <meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
    <META HTTP-EQUIV= "expires" content = "0">
    <META HTTP-EQUIV="Pragma" CONTENT="no_cache">
    <META HTTP-EQUIV="Cache-Control" CONTENT="no-cache" forua="true">
    <META NAME="robots" content="NOINDEX,NOFOLLOW">
    <%
    if (refresh > 0)
    %>
    <meta http-equiv="Refresh" content="<%= refresh %>">
    <%
    If anyone has some suggestions on how to trap this memory leak, it would be terrific. Or, some other things to try to stop the instantiation of the DatabaseAccess object (perhaps setting the scope of the beans in the header to "session" or "application"?).
    Thanks in advance.
    Roberta

    jsp:useBean tags scope declaration :
    page = Create a new instance on each load.
    session = Load instance from the session, if not there, create one
    application = Load instance from the ServletContext, if not there, create one.
    Not sure how you are populating the data variables, but make sure you are closing all ResultSet, (Prepared)Statement, and Connection objects.

Maybe you are looking for

  • Can't open more than one document at a time

    I have to open a few text documents. No matter of they are three or six, sometimes it will open but most of times, they won't. Also, Pages won't start after jumping for a while in the Dock. If you open the documents from the Open menu it will work bu

  • Error in starting Hyperion Reports

    Hi I always have a problem in starting the reports. Most of the times I will get the error Could not connect to GSM server servername:6800 why I am getting this error all the time. What exactly this GSM server do . Thanks M.V..

  • Data Committed instead of Rollback after Deadlock Error in SQL Server 2008 R2 (SP2)

    We're having a strange issue which is occurring only with one Customer having SQL Server 2008 R2 (SP2). Basically we have multiple threads uploading data and when an error occurs (like deadlock or any other error). The deadlock victim (process/transa

  • Is there a problem with my graphics card, my screen randomly goes black?

    Hi all, I've been noticing that my laptop screen randomly blacks out though the device still appears to be on. I end up doing a full shut down by pressing the power button for 5 seconds and restart thereafter. Although this has happened at various ti

  • Loose coupling transport  in PI 7.0

    Hi,   We are trying to implemet OTO.I am tring to do a loose coupling transport in PI 7.0 from DEV to QUA.  I have created one workbench request in se09 and have exported my IR object. I can see my exported IR object in IR>Tools>Find transports.  But