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 7181793 27 * @summary FileDescriptor keeps its own hard reference to Closeables 28 * @run main/othervm -Xmx32m FDStrongReference 29 */ 30 31 import java.io.IOException; 32 import java.net.ServerSocket; 33 import java.net.Socket; 34 35 public class FDStrongReference { 36 37 static int port; 38 39 public static void main(String[] args) throws IOException { 40 final ServerSocket ss = new ServerSocket(0); 41 port = ss.getLocalPort(); 42 new Thread(new Runnable() { 43 public void run() { 44 try { 45 ss.accept(); 46 } catch (IOException e) { 47 e.printStackTrace(); 48 } 49 } 50 }).start(); 51 52 int i = 0; 53 Socket socket = new Socket("localhost", port); 54 while(i <= 1000000) { 55 // buggy JDK will run out of memory in this loop 56 socket.getOutputStream(); 57 if (++i % 100000 == 0) System.out.println(i); 58 } 59 } 60 } 61