public interface HelloMBean {
    public void sayHello();
    public int add(int x, int y);
    public String getName();
    public int getCacheSize();
    public void setCacheSize(int size);
}

public class Hello implements HelloMBean{
    private final String name = "Reginald";
    private int cacheSize = DEFAULT_CACHE_SIZE;
    private static final int DEFAULT_CACHE_SIZE = 200;
    public void sayHello() {
        System.out.println("hello, world");
    }
    public int add(int x, int y) {
        return x + y;
    }
    public String getName() {
        return this.name;
    }
    public int getCacheSize() {
        return this.cacheSize;
    }
    public synchronized void setCacheSize(int size) {
        this.cacheSize = size;
        System.out.println("Cache size now " + this.cacheSize);
    }
}

 public static void main(String[] args) throws MalformedObjectNameException, NotCompliantMBeanException, InstanceAlreadyExistsException, MBeanRegistrationException, InterruptedException {
        MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
        ObjectName name = new ObjectName("com.zbk:type=Hello");
        Hello mbean = new Hello();
        mbs.registerMBean(mbean, name);
        System.out.println("Waiting forever...");
        Thread.sleep(Long.MAX_VALUE);
    }