1 /* 2 * Copyright (c) 2012, 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 }