RMI AND SSL: java.lang.ClassCastException: $Proxy0

I'm tryiong to run this simple code:

Main.java

>import java.rmi.registry.LocateRegistry;
>import java.rmi.registry.Registry;
>import java.rmi.server.RMIClientSocketFactory;
>import java.rmi.server.RMIServerSocketFactory;
>import java.rmi.server.UnicastRemoteObject;
>
>import javax.rmi.ssl.SslRMIClientSocketFactory;
>import javax.rmi.ssl.SslRMIServerSocketFactory;
>
>public class Main{
>
>      /**
>       * @param args
>       */
>      public static void main(String[] args) {
>            try{
>
>            RemoteObject ro = new RemoteObject();
>          
>            RMIClientSocketFactory csf = new SslRMIClientSocketFactory();
>              RMIServerSocketFactory ssf = new SslRMIServerSocketFactory();
>          
>                  RemoteObject serverStub =(RemoteObject) UnicastRemoteObject.exportObject(ro, 1099, csf, ssf);
>              // create the registry and bind the name and object.
>             Registry registry = LocateRegistry.createRegistry( 2004 );
>                    
>              registry.rebind("remoteObject", serverStub);
>      
>            }catch (Exception e) {
>                  e.printStackTrace();
>            }
>
>      }

The RemoteObject.file has the following code:

>public class RemoteObject implements RemoteObjectInterface{
>
>    public void receiveMessage(String message) throws Exception{
>      System.out.println("Remote: Recieved a message: \"" + message +"\"" );
>    }
>
>}

And the interface code is


>import java.rmi.*;
>import java.util.Vector;
>
>
>public interface RemoteObjectInterface extends Remote{
>
>      public void receiveMessage(String x) throws Exception;
>
>}

I get this exception:

java.lang.ClassCastException: $Proxy0
      at Main.main(Main.java:23)

I really can't understand what it's related to, i'm using JVM v 5.0.

Please it's VERY urgent