1 /*

     2  * Copyright (c) 2016, 2018, 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.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 

    26 package jdk.jfr.event.gc.detailed;

    27 

    28 import java.util.List;

    29 import java.util.LinkedList;

    30 

    31 /**

    32  * Helper class which triggers and handles out of memory error to generate

    33  * JFR events

    34  */

    35 public class OOMApp {

    36 

    37     public static List<DummyObject> dummyList;

    38 

    39     public static void main(String[] args) {

    40         int bytesToAllocate;

    41 

    42         if (args.length > 0) {

    43             bytesToAllocate = Integer.parseInt(args[0]);

    44         } else {

    45             bytesToAllocate = 1024;

    46         }

    47         System.gc();

    48         dummyList = new LinkedList<DummyObject>();

    49         System.out.println("## Initiate OOM ##");

    50         try {

    51             while (true) {

    52                 dummyList.add(new DummyObject(bytesToAllocate));

    53             }

    54         } catch (OutOfMemoryError e) {

    55             System.out.println("## Got OOM ##");

    56             dummyList = null;

    57         }

    58         System.gc();

    59     }

    60 

    61     public static class DummyObject {

    62         public byte[] payload;

    63 

    64         DummyObject(int bytesToAllocate) {

    65             payload = new byte[bytesToAllocate];

    66         }

    67     }

    68 }