xref: /openjdk10/jdk/test/javax/swing/JFileChooser/6713352/bug6713352.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
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/**
 * @test
 * @key headful
 * @bug 6713352
 * @summary Deadlock in JFileChooser with synchronized custom FileSystemView
 * @author Pavel Porvatov
 * @modules java.desktop/sun.awt.shell
 * @run main bug6713352
 */

import sun.awt.shell.ShellFolder;

import javax.swing.*;
import javax.swing.filechooser.FileSystemView;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;

public class bug6713352 {
    public static void main(String[] args) throws Exception {
        SwingUtilities.invokeAndWait(new Runnable() {
            public void run() {
                String tempDir = System.getProperty("java.io.tmpdir");

                if (tempDir == null || !new File(tempDir).isDirectory()) {
                    tempDir = System.getProperty("user.home");
                }

                MyFileSystemView systemView = new MyFileSystemView();

                synchronized (systemView) { // Get SystemView lock
                    new JFileChooser(systemView);

                    // Wait a little bit. BasicDirectoryModel will lock Invoker and stop on
                    // the bug6713352.MyFileSystemView.getFiles() method
                    try {
                        Thread.sleep(5000);
                    } catch (InterruptedException e) {
                        throw new RuntimeException(e);
                    }

                    try {
                        System.out.println("Try to get Invokers lock");

                        ShellFolder.getShellFolder(new File(tempDir)).listFiles(true);
                    } catch (FileNotFoundException e) {
                        throw new RuntimeException(e);
                    }
                }

                // To avoid RejectedExecutionException in BasicDirectoryModel wait a second
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    throw new RuntimeException(e);
                }
            }
        });
    }

    private static class MyFileSystemView extends FileSystemView {

        public File createNewFolder(File containingDir) throws IOException {
            return null;
        }

        public File[] getFiles(File dir, boolean useFileHiding) {
            System.out.println("getFiles start");

            File[] result;

            synchronized (this) {
                result = super.getFiles(dir, useFileHiding);
            }

            System.out.println("getFiles finished");

            return result;
        }

        public synchronized Boolean isTraversable(File f) {
            return super.isTraversable(f);
        }
    }
}