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  * @run main MemoryStatusOverflow

    33  */

    34 

    35 import java.lang.reflect.Method;

    36 import java.util.Arrays;

    37 import java.util.ArrayList;

    38 import java.util.List;

    39 import java.lang.management.ManagementFactory;

    40 import com.sun.management.OperatingSystemMXBean;

    41 

    42 public class MemoryStatusOverflow {

    43     static final long MEMORYSTATUS_OVERFLOW = (1L << 32) - 1; // (DWORD) -1

    44 

    45     public static void main(String... args) throws Exception {

    46         OperatingSystemMXBean bean = (OperatingSystemMXBean)

    47                 ManagementFactory.getOperatingSystemMXBean();

    48         List<String> failedGetterNames = new ArrayList<String>();

    49         List<String> testedGetterNames = Arrays.asList(

    50                 "getTotalSwapSpaceSize",      "getFreeSwapSpaceSize",

    51                 "getTotalPhysicalMemorySize", "getFreePhysicalMemorySize");

    52         for (String getterName : testedGetterNames) {

    53             Method getter = OperatingSystemMXBean.class.getMethod(getterName);

    54             long value = (Long) getter.invoke(bean);

    55             if (value == MEMORYSTATUS_OVERFLOW) {

    56                 failedGetterNames.add(getterName);

    57             }

    58         }

    59         if (!failedGetterNames.isEmpty()) {

    60             throw new AssertionError(failedGetterNames);

    61         }

    62         System.out.println("Test passed.");

    63     }

    64 }