1 /*
   2  * Copyright (c) 2012, 2015, 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 
  25 /*
  26  * @test
  27  * @bug     6853676
  28  * @summary On computers with more than 4 GB of memory,
  29  *      the GlobalMemoryStatus function can return incorrect information,
  30  *      reporting a value of -1 to indicate an overflow.
  31  *
  32  * @modules jdk.management
  33  * @run main MemoryStatusOverflow
  34  */
  35 
  36 import java.lang.reflect.Method;
  37 import java.util.Arrays;
  38 import java.util.ArrayList;
  39 import java.util.List;
  40 import java.lang.management.ManagementFactory;
  41 import com.sun.management.OperatingSystemMXBean;
  42 
  43 public class MemoryStatusOverflow {
  44     static final long MEMORYSTATUS_OVERFLOW = (1L << 32) - 1; // (DWORD) -1
  45 
  46     public static void main(String... args) throws Exception {
  47         OperatingSystemMXBean bean = (OperatingSystemMXBean)
  48                 ManagementFactory.getOperatingSystemMXBean();
  49         List<String> failedGetterNames = new ArrayList<String>();
  50         List<String> testedGetterNames = Arrays.asList(
  51                 "getTotalSwapSpaceSize",      "getFreeSwapSpaceSize",
  52                 "getTotalPhysicalMemorySize", "getFreePhysicalMemorySize");
  53         for (String getterName : testedGetterNames) {
  54             Method getter = OperatingSystemMXBean.class.getMethod(getterName);
  55             long value = (Long) getter.invoke(bean);
  56             if (value == MEMORYSTATUS_OVERFLOW) {
  57                 failedGetterNames.add(getterName);
  58             }
  59         }
  60         if (!failedGetterNames.isEmpty()) {
  61             throw new AssertionError(failedGetterNames);
  62         }
  63         System.out.println("Test passed.");
  64     }
  65 }