1 /* 2 * Copyright (c) 2012, 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 /* 25 * @test 26 * @bug 8003833 27 * @summary Spurious NPE from Socket.getIn/OutputStream 28 */ 29 30 import java.io.IOException; 31 import java.lang.reflect.Constructor; 32 import java.net.ServerSocket; 33 import java.net.Socket; 34 import java.util.concurrent.Phaser; 35 36 // Racey test, will not always fail, but if it does then there is a problem. 37 38 public class Streams { 39 static final int NUM_THREADS = 100; 40 static volatile boolean failed; 41 static final Phaser startingGate = new Phaser(NUM_THREADS + 1); 42 main(String[] args)43 public static void main(String[] args) throws Exception { 44 45 try (ServerSocket ss = new ServerSocket(0)) { 46 runTest(OutputStreamGetter.class, ss); 47 runTest(InputStreamGetter.class, ss); 48 } 49 50 if (failed) 51 throw new RuntimeException("Failed, check output"); 52 } 53 runTest(Class<? extends StreamGetter> klass, ServerSocket ss)54 static void runTest(Class<? extends StreamGetter> klass, ServerSocket ss) 55 throws Exception 56 { 57 final int port = ss.getLocalPort(); 58 Socket[] sockets = new Socket[NUM_THREADS]; 59 for (int i=0; i<NUM_THREADS; i++) { 60 sockets[i] = new Socket("localhost", port); 61 try (Socket socket = ss.accept()) {} 62 } 63 64 Constructor<? extends StreamGetter> ctr = klass.getConstructor(Socket.class); 65 66 Thread[] threads = new Thread[NUM_THREADS]; 67 for (int i=0; i<NUM_THREADS; i++) 68 threads[i] = ctr.newInstance(sockets[i]); 69 for (int i=0; i<NUM_THREADS; i++) 70 threads[i].start(); 71 72 startingGate.arriveAndAwaitAdvance(); 73 for (int i=0; i<NUM_THREADS; i++) 74 sockets[i].close(); 75 76 for (int i=0; i<NUM_THREADS; i++) 77 threads[i].join(); 78 } 79 80 static abstract class StreamGetter extends Thread { 81 final Socket socket; StreamGetter(Socket s)82 StreamGetter(Socket s) { socket = s; } 83 84 @Override run()85 public void run() { 86 try { 87 startingGate.arriveAndAwaitAdvance(); 88 getStream(); 89 } catch (IOException x) { 90 // OK, socket may be closed 91 } catch (NullPointerException x) { 92 x.printStackTrace(); 93 failed = true; 94 } 95 } 96 getStream()97 abstract void getStream() throws IOException; 98 } 99 100 static class InputStreamGetter extends StreamGetter { InputStreamGetter(Socket s)101 public InputStreamGetter(Socket s) { super(s); } getStream()102 void getStream() throws IOException { 103 socket.getInputStream(); 104 } 105 } 106 107 static class OutputStreamGetter extends StreamGetter { OutputStreamGetter(Socket s)108 public OutputStreamGetter(Socket s) { super(s); } getStream()109 void getStream() throws IOException { 110 socket.getOutputStream(); 111 } 112 } 113 } 114