1 /*
   2  * Copyright (c) 2016, 2019, 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.testlibrary.jfr;
  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 }