* Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.

import com.sun.management.HotSpotDiagnosticMXBean;

import java.lang.management.ManagementFactory;

import java.util.Arrays;

import java.util.Set;

import java.util.stream.Collectors;

import javax.management.MBeanServerConnection;

import javax.management.openmbean.CompositeData;

import javax.management.openmbean.CompositeType;

import javax.management.openmbean.OpenType;

import static javax.management.openmbean.SimpleType.*;

 * @modules jdk.management/com.sun.management

    private static final String[] names = new String[] {

        "name", "value", "origin", "writeable"

    };

    private static final OpenType[] types = new OpenType[] {

        STRING, STRING, STRING, BOOLEAN

    };

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

        MBeanServerConnection msc = ManagementFactory.getPlatformMBeanServer();

        HotSpotDiagnosticMXBean mxbean =

            ManagementFactory.getPlatformMXBean(msc, HotSpotDiagnosticMXBean.class);

        String[] signatures = new String[] {

            String.class.getName()

        };

        Object obj = msc.invoke(mxbean.getObjectName(), "getVMOption",

            new String[] { "PrintVMOptions"}, signatures);

        CompositeData data = (CompositeData)obj;

        validateType(data);

        VMOption option = mxbean.getVMOption("PrintVMOptions");

        VMOption o = VMOption.from(data);

        assertEquals(option, o);

    }

    private static void validateType(CompositeData data) {

        CompositeType type = data.getCompositeType();

        Set<String> keys = Arrays.stream(names).collect(Collectors.toSet());

        if (!type.keySet().equals(keys)) {

            throw new RuntimeException("key not matched: " + type.keySet().toString());

        }

        for (int i=0; i < names.length; i++) {

            OpenType t = type.getType(names[i]);

            if (t != types[i]) {

                throw new AssertionError(names[i] + ": type not matched: " +

                    t + " expected: " + types[i]);

    private static void assertEquals(VMOption o1, VMOption o2) {

        if (!o1.getName().equals(o2.getName()) ||

            !o1.getOrigin().equals(o2.getOrigin()) ||

            !o1.getValue().equals(o2.getValue()) ||

            o1.isWriteable() != o2.isWriteable()) {

            throw new AssertionError(o1 + " != " + o2);

        }

    }