Thanks,  but it didnt work.

The Patient(the impl) already extends UnicastRemoteObject, teh problem is
also that i cant expend also DataModel that makes the database connection. I
am a newbie in this case, I will show you the files:

Patient.java

import java.rmi.*;
import java.rmi.server.*;

public class Patient extends UnicastRemoteObject implements PatientInterface
{

}

PatientServer.java
import java.rmi.*;

public class PatientServer
{

   public static void main(String[] args)
   {
       try
       {
           if (System.getSecurityManager() == null)
           {
               System.setSecurityManager ( new RMISecurityManager());
           }
           Patient patientImpl = new Patient();
           System.out.println("Binding...");

           Naming.bind("PatientServer", patientImpl);
           System.out.println("PatientServer is ready...");

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

}

I would appriciate if i can send you the files, and you can take a look, i
would even be willing to pay, becouse i really need to unerstand this

Thanks in advance

Irlan