test/jdk/java/lang/management/MemoryMXBean/GetMBeanInfo.java

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/*
 * @test
 * @bug     4930397
 * @summary Make sure MemoryMXBean has two notification types.
 * @author  Mandy Chung
 *
 * @modules jdk.management
 * @run main GetMBeanInfo
 */

import java.lang.management.*;
import javax.management.*;

public class GetMBeanInfo {
    private static final int EXPECTED_NOTIF_TYPES = 2;
    private static int count = 0;

    public static void main(String argv[]) throws Exception {
        final ObjectName objName;
        objName = new ObjectName(ManagementFactory.MEMORY_MXBEAN_NAME);

        MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();

        MBeanInfo minfo = mbs.getMBeanInfo(objName);
        MBeanNotificationInfo[] notifs = minfo.getNotifications();
        for (int i = 0; i < notifs.length; i++) {
            printNotifType(notifs[i]);
        }

        if (count != EXPECTED_NOTIF_TYPES) {
            throw new RuntimeException("Unexpected number of notification types"
                                       + " count = " + count +
                                       " expected = " + EXPECTED_NOTIF_TYPES);
        }
    }

    private static void printNotifType(MBeanNotificationInfo notif) {
        String[] types = notif.getNotifTypes();
        for (int i = 0; i < types.length; i++) {
            System.out.println(types[i]);
            count++;
        }
    }
}