1 /*
   2  * Copyright (c) 2007, 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
  21  * questions.
  22  */
  23 
  24 /* @test
  25    @bug  6526376
  26    @summary DeleteOnExitHook.add() produces NullPointerException
  27  */
  28 
  29 import java.io.*;
  30 
  31 /* NullPointerException in exec'ed process if fails.
  32  * This testcase is timing sensitive. It may sometimes pass even with this bug
  33  * present, but will never fail without it.
  34  */
  35 
  36 public class DeleteOnExitNPE implements Runnable
  37 {
  38     public static void main(String[] args) throws Exception {
  39         if (args.length == 0) {
  40             runTest();
  41         } else {
  42             doTest();
  43         }
  44     }
  45 
  46     public static void runTest() throws Exception {
  47         String cmd = System.getProperty("java.home") + File.separator +
  48                      "bin" + File.separator + "java" +
  49                      " -classpath " + System.getProperty("test.classes");
  50         Process process = Runtime.getRuntime().exec(cmd +  " DeleteOnExitNPE -test");
  51         BufferedReader isReader = new BufferedReader(new InputStreamReader(process.getInputStream()));
  52         BufferedReader esReader = new BufferedReader(new InputStreamReader(process.getErrorStream()));
  53 
  54         process.waitFor();
  55 
  56         boolean failed = false;
  57         String str;
  58         while ((str = isReader.readLine()) != null) {
  59             failed = true;
  60             System.out.println(str);
  61         }
  62         while ((str = esReader.readLine()) != null) {
  63             failed = true;
  64             System.err.println(str);
  65         }
  66 
  67         if (failed)
  68             throw new RuntimeException("Failed: No output should have been received from the process");
  69     }
  70 
  71     public static void doTest() {
  72         try {
  73             File file = File.createTempFile("DeleteOnExitNPE", null);
  74             file.deleteOnExit();
  75 
  76             Thread thread = new Thread(new DeleteOnExitNPE());
  77             thread.start();
  78 
  79             try {
  80                 Thread.sleep(2000);
  81             } catch (InterruptedException ie) {
  82                 ie.printStackTrace();
  83             }
  84 
  85             System.exit(0);
  86         } catch (IOException ioe) {
  87             ioe.printStackTrace();
  88         }
  89     }
  90 
  91     public void run() {
  92         File file = new File("xxyyzz");
  93 
  94         try {
  95             for (;;) {
  96                 file.deleteOnExit();
  97             }
  98         } catch (IllegalStateException ise) {
  99             // ignore. This is ok.
 100             // Trying to add a file to the list of files marked as deleteOnExit when
 101             // shutdown is in progress and the DeleteOnExitHook is running.
 102         }
 103     }
 104 }