1 /*
   2  * Copyright (c) 2017, 2018, Red Hat, Inc. 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 /**
  26  * @test TestMemoryPools
  27  * @key gc
  28  * @requires vm.gc.Epsilon
  29  * @summary Test JMX memory pools
  30  * @modules java.base/jdk.internal.misc
  31  *          java.management
  32  * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC -Xmx1g -Xms1g TestMemoryPools
  33  */
  34 
  35 import java.lang.management.*;
  36 import java.util.*;
  37 
  38 public class TestMemoryPools {
  39 
  40     public static void main(String[] args) throws Exception {
  41         List<MemoryManagerMXBean> mms = ManagementFactory.getMemoryManagerMXBeans();
  42         if (mms == null) {
  43             throw new RuntimeException("getMemoryManagerMXBeans is null");
  44         }
  45         if (mms.isEmpty()) {
  46             throw new RuntimeException("getMemoryManagerMXBeans is empty");
  47         }
  48         for (MemoryManagerMXBean mmBean : mms) {
  49             String[] names = mmBean.getMemoryPoolNames();
  50             if (names == null) {
  51                 throw new RuntimeException("getMemoryPoolNames() is null");
  52             }
  53             if (names.length == 0) {
  54                 throw new RuntimeException("getMemoryPoolNames() is empty");
  55             }
  56             for (String name : names) {
  57                 if (name == null) {
  58                     throw new RuntimeException("pool name is null");
  59                 }
  60                 if (name.length() == 0) {
  61                     throw new RuntimeException("pool name is empty");
  62                 }
  63             }
  64         }
  65     }
  66 }