Name: jk109818 Date: 07/08/2002


FULL PRODUCT VERSION :
java version "1.4.1-beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.1-beta-b14)
Java HotSpot(TM) Client VM (build 1.4.1-beta-b14, mixed mode)

Microsoft Windows 2000 [Version 5.00.2195]






A DESCRIPTION OF THE PROBLEM :
NullPointerException thrown by JFileChooser, but also
currupts any future access to the fileChooser and
FileSystemView

There seems to be a resource locking problem when accessing
system level icons

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run the following code



EXPECTED VERSUS ACTUAL BEHAVIOR :
The program should effectivaly run for ever, however within
ten minutes it crashes. This is a more extream test case.

ERROR MESSAGES/STACK TRACES THAT OCCUR :
java.lang.NullPointerException
at javax.swing.ImageIcon.<init>(ImageIcon.java:161)
at javax.swing.ImageIcon.<init>(ImageIcon.java:147)
at
com.sun.java.swing.plaf.windows.WindowsFileChooserUI$ShortCutPanel.<init>
(WindowsFileChooserUI.java:592)
at
com.sun.java.swing.plaf.windows.WindowsFileChooserUI.installComponents
(WindowsFileChooserUI.java:355)
at javax.swing.plaf.basic.BasicFileChooserUI.installUI
(BasicFileChooserUI.java:130)
at com.sun.java.swing.plaf.windows.WindowsFileChooserUI.installUI
(WindowsFileChooserUI.java:175)
at javax.swing.JComponent.setUI(JComponent.java:449)
at javax.swing.JFileChooser.updateUI(JFileChooser.java:1700)
at javax.swing.JFileChooser.setup(JFileChooser.java:345)
at javax.swing.JFileChooser.<init>(JFileChooser.java:320)
at javax.swing.JFileChooser.<init>(JFileChooser.java:273)
at Test$MyFileChooser.<init>(Test.java:117)
at Test.getFileChooser(Test.java:113)
at Test$2.run(Test.java:76)

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
/*
 * Test.java
 *
 * (C) Yolus Limited
 * All rights reserved
 *
 */
import java.io.*;
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
import javax.swing.filechooser.*;

/**
 *
 */
public class Test {
    static int count;
    private static FileSystemView fileSystemView =
FileSystemView.getFileSystemView();

    public static void scanDirectory(File parent) {
        File[] files = parent.listFiles();
        if (files == null)
            return;
        for (int i = 0; i < files.length; i++) {
            if (files[i].isDirectory()) {
                scanDirectory(files[i]);
            } else {
                try {

                    Object icon = fileSystemView.getSystemIcon(files[i]);
                    if (icon==null) {
                        System.out.println("Failed to get icon for file " +
files[i]);
                        System.exit(-1);
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                    System.exit(-1);
                }
            }
            if (++count >= 10) {
                count = 0;
                // gc and sleep just to prove finalizer doesn't help
                System.gc();
            }
        }
    }


    public static void main(String[] arg) throws Exception {
        UIManager.setLookAndFeel( UIManager.getSystemLookAndFeelClassName() );

        final JFrame temp = new JFrame("Look!");
        temp.pack();
        temp.show();
        temp.dispose();
        for (int q=0;q<10;q++) {
            SwingUtilities.invokeLater( new Runnable() {
                public void run() {
                    try {
                        final File[] roots = fileSystemView.getRoots();
                        for (int i = 0; i < roots.length; i++) {
                            Thread thread = new RootThread(roots[i]);
                            thread.start();
                        }
                    } catch (Throwable t) {
                        t.printStackTrace();
                        System.exit(-1);
                    }
                }
            });
        }
        JFrame frame = new JFrame( "Panel");
        Thread fileChooserThread = new Thread() {
            public void run() {
                final JDialog fileChooser = getFileChooser(temp);
                synchronized (this) {
                    try {
                        Thread.currentThread().sleep(100*60);
                        fileChooser.dispose();
                    } catch (Throwable ignore) {
                    }
                }
            }
        };
        synchronized (frame) {
            try {
                Thread.currentThread().sleep(10 * 60 * 100);
                fileChooserThread.start();
            } catch (Throwable ignore) {
            }
        }

        frame.addWindowListener( new WindowAdapter() {
            public void windowClosing( WindowEvent e ) {
                System.exit(0);
            }
        });
        frame.pack();
        frame.show();
    }

    static class RootThread extends Thread {
        private File file;
        public RootThread(File file) {
            this.file = file;
        }
        public void run() {
            scanDirectory(file);
        }
    }
    public static JDialog getFileChooser(final JFrame temp) {
        MyFileChooser fileChooser = new MyFileChooser();
         return fileChooser.createDialog(temp);
    }

    static class MyFileChooser extends JFileChooser {
        public JDialog createDialog(Component parent) {
            return super.createDialog(parent);
        }
    }
}

---------- END SOURCE ----------
(Review ID: 159025)
======================================================================