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