| /* |
| * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * 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 |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| /* |
| * @test |
| * @bug 4518797 |
| * @summary Make sure that hashCode() and read/writeObject() are thread-safe. |
| * @run main Bug4518797 10 |
| */ |
| |
| import java.util.*; |
| import java.io.*; |
| |
| // Usage: java Bug4518797 [duration] |
| public class Bug4518797 { |
| static volatile boolean runrun = true; |
| static volatile String message = null; |
| |
| public static void main(String[] args) { |
| int duration = 180; |
| if (args.length == 1) { |
| duration = Math.max(5, Integer.parseInt(args[0])); |
| } |
| final Locale loc = new Locale("ja", "US"); |
| final int hashcode = loc.hashCode(); |
| |
| System.out.println("correct hash code: " + hashcode); |
| Thread t1 = new Thread(new Runnable() { |
| public void run() { |
| while (runrun) { |
| int hc = loc.hashCode(); |
| if (hc != hashcode) { |
| runrun = false; |
| message = "t1: wrong hashcode: " + hc; |
| } |
| } |
| } |
| }); |
| |
| Thread t2 = new Thread(new Runnable() { |
| public void run() { |
| // Repeat serialization and deserialization. And get the |
| // hash code from a deserialized Locale object. |
| while (runrun) { |
| try { |
| ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
| ObjectOutputStream oos = new ObjectOutputStream(baos); |
| oos.writeObject(loc); |
| byte[] b = baos.toByteArray(); |
| oos.close(); |
| ByteArrayInputStream bais = new ByteArrayInputStream(b); |
| ObjectInputStream ois = new ObjectInputStream(bais); |
| Locale loc2 = (Locale) ois.readObject(); |
| int hc = loc2.hashCode(); |
| if (hc != hashcode) { |
| runrun = false; |
| message = "t2: wrong hashcode: " + hc; |
| } |
| } catch (IOException ioe) { |
| runrun = false; |
| throw new RuntimeException("t2: can't perform test", ioe); |
| } catch (ClassNotFoundException cnfe) { |
| runrun = false; |
| throw new RuntimeException("t2: can't perform test", cnfe); |
| } |
| } |
| } |
| }); |
| |
| t1.start(); |
| t2.start(); |
| try { |
| for (int i = 0; runrun && i < duration; i++) { |
| Thread.sleep(1000); |
| } |
| runrun = false; |
| t1.join(); |
| t2.join(); |
| } catch (InterruptedException e) { |
| } |
| if (message != null) { |
| throw new RuntimeException(message); |
| } |
| } |
| } |