Bug in JTextPane ??

Hi,

I am facing huge memory leak problems with JTextArea/JTextPane. After considerable investigation, I found out that the Document associated with the component is not being GC'ed properly. I ran OptimizeIt and found out that the memory is being consumed by the JTextPane.setText() method. I have implmented a HTML viewer to display large amounts of HTML data and it is leaking memory like crazy on each successive execution. Any thoughts ??

JDK1.4.2_01, WinXP

Here is the code fragment:

public class ReportViewer extends BaseFrame implements FontChange_int
{
      private      String            cReport;            
      private boolean            testMode = false;      

      // Graphical components
      private      BorderLayout      cMainLayout;
      private      JButton            cClose;
      private      JTextPane      cRptPane;
      private      Button            cClose2;

      private ViewUpdater     cViewUpdater = null;

      // Constants
      final      static      int      startupXSize = 650;
      final      static      int      startupYSize = 500;

      // Methods
      public ReportViewer(String report, ReportMain main)
      {
            // BaseFrame extends JFrame
            super("Reports Viewer", true, startupXSize, startupYSize);
            testMode     = false;
            cReport      = report;
            cViewUpdater = new ViewUpdater();
            initialize();
      }

      public void initialize()
      {
            // Create main layout manager
            cMainLayout = new BorderLayout();
            getContentPane().setLayout(cMainLayout);

            // Quick button bar - print, export, save as
            JToolBar      topPanel = new JToolBar();
            topPanel.setBorder(new BevelBorder(BevelBorder.RAISED) );
            java.net.URL      url;

            topPanel.add(Box.createHorizontalStrut(10));

            url = Scm.class.getResource("images/Exit.gif");
            cClose = new Button(new ImageIcon(url), true);
            cClose.setToolTipText("Close Window");
            topPanel.add(cClose);
            getContentPane().add(topPanel, BorderLayout.NORTH);

            // Main view window - HTML
            cRptPane = new JTextPane();
            cRptPane.setContentType("text/html");
            cRptPane.setEditable(false);

            JScrollPane sp = new JScrollPane(cRptPane);
            getContentPane().add(sp, BorderLayout.CENTER);

            // Main button - Close
            JPanel      bottomPanel = new JPanel();
            url = Scm.class.getResource("images/Exit.gif");
            cClose2 = new Button(new ImageIcon(url), "Close");
            bottomPanel.add(cClose2);
            getContentPane().add(bottomPanel, BorderLayout.SOUTH);

            cClose.addActionListener(new ActionListener() {
                  public void actionPerformed(ActionEvent e) {
                        closeWindow();
                  }
            });
            cClose2.addActionListener(new ActionListener() {
                  public void actionPerformed(ActionEvent e) {
                        closeWindow();
                  }
            });

            show();
            cViewUpdater.setText(cReport);
            SwingUtilities.invokeLater(cViewUpdater);
      }


      protected void
      closeWindow()
      {
            super.closeWindow();

            // If I add the following lines, the GC reclaims
                // part of the memory but does not flush out the text
                // component as a whole
            
            /*Document doc = cRptPane.getDocument();
            try
            {
                  doc.remove(0,doc.getLength());
            }
            catch(Exception e) {;}
            doc=null; */
            
            cRptPane=null;
            cReport = null;
            cViewUpdater = null;
            dispose();
      }

      private class ViewUpdater implements Runnable
      {
            private String cText = null;

            public ViewUpdater() {;}

            public void
            setText(String text) {
                  cText = text;
            }
            
            public void
            run() {
                  cRptPane.setText(cText);
                  cRptPane.setCaretPosition(0);
                  cText = null;
            }
      }

      // Local main - for testing
      public static void main(String args[])
      {
            //new ReportViewer(str,comp);
      }
}


--
Sudarshan
www.spectrumscm.com