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 {
main(String[] args)38     public static void main(String[] args) throws Exception {
39         if (args.length == 0) {
40             runTest();
41         } else {
42             doTest();
43         }
44     }
45 
runTest()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 
doTest()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 
run()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 }
105