RMI hello world #lab

Client.java

package io.github.benas.labs.javase.rmi;

import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;

public class Client {

    public static void main(String[] args) throws Exception{

            Registry r = LocateRegistry.getRegistry("localhost", 2000);

            IFoo foo = (IFoo) r.lookup("remoteFoo");

            System.out.println(foo.getMessage());

    }

}

Foo.java

package io.github.benas.labs.javase.rmi;

import java.rmi.RemoteException;
import java.rmi.server.UnicastRemoteObject;

public class Foo extends UnicastRemoteObject implements IFoo{

    private static final long serialVersionUID = -5655647669552931408L;

    protected Foo() throws RemoteException {
        super();
    }

    public String getMessage() throws RemoteException {
        return " Hi from remote Foo!";
    }

}

IFoo.java

package io.github.benas.labs.javase.rmi;

import java.rmi.Remote;
import java.rmi.RemoteException;

public interface IFoo extends Remote {

    public String getMessage() throws RemoteException;

}

Main.java

package io.github.benas.labs.javase.rmi;

import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;

public class Main {

    public static void main(String[] args) {

        // run with -Djava.security.manager -Djava.security.policy=/path/to/security.policy
        try {

            Registry registry = LocateRegistry.createRegistry(2000);
            System.setSecurityManager(new java.rmi.RMISecurityManager());

            IFoo foo = new Foo();
            registry.bind("remoteFoo", foo);

            System.out.println("RMI registry started.");

        } catch (Exception e) {
            e.printStackTrace();
        }

    }

}

security.policy

grant {
 permission java.net.SocketPermission "*:2000-2100", "accept, connect";
 permission java.net.SocketPermission "*:80", "connect";
 permission java.security.AllPermission "", "";

 
 
 //From Sun : http://java.sun.com/j2se/1.5.0/docs/guide/jndi/jndi-rmi.html
 //The application using JNDI and the RMI registry provider must be granted the following permissions:

//permission java.net.SocketPermission "host[:port]", "connect";

   // For each host/port identified in the java.naming.provider.url property and in URL string names supplied to context methods. 

//permission java.net.SocketPermission "host[:port]", "connect,accept";

    //For each host/port identified in the URL strings in javax.naming.References. 

//permission java.lang.RuntimePermission "setSecurityManager";

   // If using the java.naming.rmi.security.manager environment property, which asks the RMI registry provider to install the RMISecurityManager. 

};