1 /*
   2  * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
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  23 
  24 /* @test
  25    @bug 6945316
  26    @summary The Win32ShellFolderManager2.isFileSystemRoot can throw NPE
  27    @author Pavel Porvatov
  28    @run main bug6945316
  29 */
  30 
  31 import sun.awt.OSInfo;
  32 import sun.awt.shell.ShellFolder;
  33 
  34 import java.awt.*;
  35 import java.io.File;
  36 import java.util.concurrent.CountDownLatch;
  37 
  38 public class bug6945316 {
  39     public static void main(String[] args) throws Exception {
  40         if (OSInfo.getOSType() != OSInfo.OSType.WINDOWS) {
  41             System.out.println("The test is suitable only for Windows OS. Skipped.");
  42 
  43             return;
  44         }
  45 
  46         // Init toolkit because it shouldn't be interrupted while initialization
  47         Toolkit.getDefaultToolkit();
  48 
  49         // Init the sun.awt.shell.Win32ShellFolderManager2.drives field
  50         ShellFolder.get("fileChooserComboBoxFolders");
  51 
  52         // To get NPE the path must obey the following rules:
  53         // path.length() == 3 && path.charAt(1) == ':'
  54         final File tempFile = new File("c:\\");
  55 
  56         for (int i = 0; i < 10000; i++) {
  57             final CountDownLatch countDownLatch = new CountDownLatch(1);
  58 
  59             final Thread thread = new Thread() {
  60                 public void run() {
  61                     countDownLatch.countDown();
  62 
  63                     ShellFolder.isFileSystemRoot(tempFile);
  64                 }
  65             };
  66 
  67             thread.start();
  68 
  69             countDownLatch.await();
  70 
  71             thread.interrupt();
  72         }
  73     }
  74 }