1 /*
   2  * Copyright (c) 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 import java.util.logging.*;
  25 
  26 public class AnonLoggerWeakRefLeak {
  27     public static int DEFAULT_LOOP_TIME = 60;  // time is in seconds
  28 
  29     public static void main(String[] args) {
  30         int loop_time = 0;
  31         int max_loop_time = DEFAULT_LOOP_TIME;
  32 
  33         if (args.length == 0) {
  34             System.out.println("INFO: using default time of "
  35                 + max_loop_time + " seconds.");
  36         } else {
  37             try {
  38                 max_loop_time = Integer.parseInt(args[0]);
  39             } catch (NumberFormatException nfe) {
  40                 System.err.println("Error: '" + args[0]
  41                     + "': is not a valid seconds value.");
  42                 System.err.println("Usage: AnonLoggerWeakRefLeak [seconds]");
  43                 System.exit(1);
  44             }
  45         }
  46 
  47         long count = 0;
  48         long now = 0;
  49         long startTime = System.currentTimeMillis();
  50 
  51         while (now < (startTime + (max_loop_time * 1000))) {
  52             if ((count % 1000) == 0) {
  53                 // Print initial call count to let caller know that
  54                 // we're up and running and then periodically
  55                 System.out.println("INFO: call count = " + count);
  56             }
  57 
  58             for (int i = 0; i < 100; i++) {
  59                 // this Logger call is leaking a WeakReference in Logger.kids
  60                 java.util.logging.Logger.getAnonymousLogger();
  61                 count++;
  62             }
  63 
  64             try {
  65                 // delay for 1/10 of a second to avoid CPU saturation
  66                 Thread.sleep(100);
  67             } catch (InterruptedException ie) {
  68                 // ignore any exceptions
  69             }
  70 
  71             now = System.currentTimeMillis();
  72         }
  73 
  74         System.out.println("INFO: final loop count = " + count);
  75     }
  76 }