Error in RMI simple code!

Question

i am using 4 files for rmi
//Interface file
public interface Calculator extends java.rmi.Remote{
public long add(long a,long b)throws java.rmi.RemoteException;
public long sub(long a,long b)throws java.rmi.RemoteException;
public long mul(long a,long b)throws java.rmi.RemoteException;
public long div(long a,long b)throws java.rmi.RemoteException;
//Implementation file
public class CalculatorImpl extends java.rmi.server.UnicastRemoteObject
implements Calculator{
public CalculatorImpl() throws java.rmi.RemoteException
super();
public long add(long a, long b) throws RemoteException {
return(a+b);
public long sub(long a, long b) throws RemoteException {
return(a-b);
public long mul(long a, long b) throws RemoteException {
return(a*b);
public long div(long a, long b) throws RemoteException {
return(a/b);
//Server File
import java.rmi.Naming;
* To change this template, choose Tools | Templates
* and open the template in the editor.
* @author Vedita
public class CalculatorServer {
public CalculatorServer(){
try{
Calculator c = (Calculator) new CalculatorImpl();
Naming.rebind("rmi://localhost:1099/Calculator", c);
catch (Exception e) {
System.out.println("Trouble"+e);
public static void main(String args[]){
new CalculatorServer();
//Client File
import java.net.MalformedURLException;
import java.rmi.Naming;
import java.rmi.NotBoundException;
import java.rmi.RemoteException;
* To change this template, choose Tools | Templates
* and open the template in the editor.
* @author Vedita
public class CalculatorClient {
public static void main(String args[]) throws NotBoundException, MalformedURLException, RemoteException{
try{
Calculator c= (Calculator) Naming.lookup("rmi://remotehost:1099/Calculator");
System.out.println(c.sub(4, 3));
System.out.println(c.add(4, 5));
System.out.println(c.mul(3, 6));
System.out.println(c.div(9, 3));
catch(MalformedURLException murle){
System.out.println();
System.out.println("MalformedURLException");
System.out.println(murle);
catch(RemoteException re){
System.out.println();
System.out.println("RemoteException");
System.out.println(re);
catch(NotBoundException nbe){
System.out.println();
System.out.println("NotBoundException");
System.out.println(nbe);
catch(java.lang.ArithmeticException ae){
System.out.println();
System.out.println("ArithmeticException");
System.out.println(ae);
i am executing the code as follows in command prompt
in one cmd prompt
javac *.java
rmic CalculatorImpl
rmiregistry
in other cmd prompt
javac *.java
java CalculatorServer
i am getting this error
Error java.rmi.ServerException: RemoteException occurred in server thread; nested exception is:
java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is:
java.lang.ClassNotFoundException: CalculatorImpl_Stub
Please Please help me because i have to submit the project in my college and this basic program is also not working in my pc. Please can anyone help me?

Answer 1

//Implementation file
public class CalculatorImpl extends java.rmi.server.UnicastRemoteObject
implements Calculator{
public CalculatorImpl() throws java.rmi.RemoteException
super();super(0);