I have discovered one not simply repeatable but very annoying problem in
JFileChooser. My environment is Swing 1.02, JRE 1.1.6, Windows NT 4.0,
Pentium 200 MMX, 64 Mb of RAM. The problem mostly appears if JIT is
turned on (that is with the following command line: "jre -classpath
%CLASSPATH% FileChooserDups").

The problem is: in attached test case, in directory pane the content of
BOTH directories appears at the same time: my home directory (d:\ in
this case) and the directory where I do setCurrentDirectory()
(c:\pav\pro).

The test case follows (you will have to change hard-coded directory name
"c:\\pav\\pro" to some place existing on your system other than your home directory):

//----cut here-----
/**
 * Q. it seems that JFileChooser sometimes duplicates a list of files
 * to be shown if run with jit (Swing. 1.0.2, JDK1.1.6)
 * A. Yes, it is mostly reproducable (70%).
 */
import com.sun.java.swing.JButton;
import com.sun.java.swing.JFrame;
import com.sun.java.swing.UIManager;
import com.sun.java.swing.preview.JFileChooser;
import com.sun.java.swing.preview.filechooser.FileFilter;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowEvent;
import java.awt.event.WindowAdapter;
import java.io.File;

public class FileChooserDups
  {
  public static void main(String [] args)
    {
    try
      {
     
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
      }
    catch(Exception e)
      {
      System.err.println("Cannot set system defauls L&F:" + e );
      System.exit(0);
      }
    final JFrame tf = new JFrame("Test JFrame");
    JButton showFCButton = new JButton("Choose File...");
    showFCButton.addActionListener(new ActionListener()
      {
      public void actionPerformed(ActionEvent e)
        {
        File dir = new File(System.getProperty("user.home"));
        JFileChooser fc = new JFileChooser(dir);
        fc.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
        fc.setDialogTitle("Select directory for new project");
        fc.setFileFilter(new FileFilter()
          {
          public boolean accept(File f)
            { return f.isDirectory(); }
          public String getDescription()
            { return "Directories"; }
          });
        fc.setCurrentDirectory(new File("c:\\pav\\pro"));
        if(fc.showOpenDialog(tf) ==
            JFileChooser.APPROVE_OPTION)
          System.out.println(fc.getSelectedFile().getPath());
        else
          System.out.println("Dialog cancelled");
        }
      });
    tf.setBounds(200, 100, 400, 200);
    tf.getContentPane().add(showFCButton);
    tf.addWindowListener(new WindowAdapter()
      {
      public void windowClosing(WindowEvent e) { System.exit(0); }
      });
    tf.show();
    }
  }
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