MemoryStatusOverflow.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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 * 2 along with this work; if not, write to the Free Software Foundation,
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/*
 * @test
 * @bug     6853676
 * @summary On computers with more than 4 GB of memory,
 *      the GlobalMemoryStatus function can return incorrect information,
 *      reporting a value of -1 to indicate an overflow.
 *
 * @run main MemoryStatusOverflow
 */

import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.ArrayList;
import java.util.List;
import java.lang.management.ManagementFactory;
import com.sun.management.OperatingSystemMXBean;

public class MemoryStatusOverflow {
    static final long MEMORYSTATUS_OVERFLOW = (1L << 32) - 1; // (DWORD) -1

    public static void main(String... args) throws Exception {
        OperatingSystemMXBean bean = (OperatingSystemMXBean)
                ManagementFactory.getOperatingSystemMXBean();
        List<String> failedGetterNames = new ArrayList<String>();
        List<String> testedGetterNames = Arrays.asList(
                "getTotalSwapSpaceSize",      "getFreeSwapSpaceSize",
                "getTotalPhysicalMemorySize", "getFreePhysicalMemorySize");
        for (String getterName : testedGetterNames) {
            Method getter = OperatingSystemMXBean.class.getMethod(getterName);
            long value = (Long) getter.invoke(bean);
            if (value == MEMORYSTATUS_OVERFLOW) {
                failedGetterNames.add(getterName);
            }
        }
        if (!failedGetterNames.isEmpty()) {
            throw new AssertionError(failedGetterNames);
        }
        System.out.println("Test passed.");
    }
}