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 }