Please Help Me

I'm trying to make a calculator server using javaspaces for a month but I
can't do it ... anybody here have a calculator server with remote client
source code? What I do with this code below???

see my problems

C:\Documents and Settings\Tati\Desktop\Pesquisas\pratica\Tentativa2>java -classp
ath .\;"C:\Arquivos de programas\jini2_1\lib\jini-ext.jar";"C:\Documents and Set
tings\Tati\Desktop\Pesquisas\pratica\pac.jar";"C:\Arquivos de programas\jini2_1\
lib\reggie.jar";"C:\Arquivos de programas\jini2_1\lib\outrigger.jar";"C:\Arquivo
s de programas\jini2_1\lib\jini-core.jar" Cliente
Localizando JavaSpace...

JavaSpace localizado.

java.rmi.ServerException: RemoteException in server thread; nested exception is:

        java.rmi.UnmarshalException: unmarshalling method/arguments; nested exce
ption is:
        java.lang.ClassNotFoundException: Calculadora2App.Resultado
        at net.jini.jeri.BasicInvocationDispatcher.dispatch(BasicInvocationDispa
tcher.java:644)
        at com.sun.jini.jeri.internal.runtime.ObjectTable$6.run(ObjectTable.java
:597)
        at net.jini.export.ServerContext.doWithServerContext(ServerContext.java:
103)
        at com.sun.jini.jeri.internal.runtime.ObjectTable$Target.dispatch0(Objec
tTable.java:595)
        at com.sun.jini.jeri.internal.runtime.ObjectTable$Target.access$700(Obje
ctTable.java:212)
        at com.sun.jini.jeri.internal.runtime.ObjectTable$5.run(ObjectTable.java
:568)
        at com.sun.jini.start.AggregatePolicyProvider$6.run(AggregatePolicyProvi
der.java:527)
        at java.security.AccessController.doPrivileged(Native Method)
        at com.sun.jini.jeri.internal.runtime.ObjectTable$Target.dispatch(Object
Table.java:565)
        at com.sun.jini.jeri.internal.runtime.ObjectTable$Target.dispatch(Object
Table.java:540)
        at com.sun.jini.jeri.internal.runtime.ObjectTable$RD.dispatch(ObjectTabl
e.java:778)
        at net.jini.jeri.connection.ServerConnectionManager$Dispatcher.dispatch(
ServerConnectionManager.java:148)
        at com.sun.jini.jeri.internal.mux.MuxServer$2.run(MuxServer.java:244)
        at com.sun.jini.start.AggregatePolicyProvider$5.run(AggregatePolicyProvi
der.java:513)
        at java.security.AccessController.doPrivileged(Native Method)
        at com.sun.jini.jeri.internal.mux.MuxServer$1.run(MuxServer.java:241)
        at com.sun.jini.thread.ThreadPool$Worker.run(ThreadPool.java:136)
        at java.lang.Thread.run(Thread.java:595)
        at com.sun.jini.jeri.internal.runtime.Util.__________EXCEPTION_RECEIVED_
FROM_SERVER__________(Util.java:108)
        at com.sun.jini.jeri.internal.runtime.Util.exceptionReceivedFromServer(U
til.java:101)
        at net.jini.jeri.BasicInvocationHandler.unmarshalThrow(BasicInvocationHa
ndler.java:1303)
        at net.jini.jeri.BasicInvocationHandler.invokeRemoteMethodOnce(BasicInvo
cationHandler.java:832)
        at net.jini.jeri.BasicInvocationHandler.invokeRemoteMethod(BasicInvocati
onHandler.java:659)
        at net.jini.jeri.BasicInvocationHandler.invoke(BasicInvocationHandler.ja
va:528)
        at com.sun.jini.outrigger.$Proxy1.notify(Unknown Source)
        at com.sun.jini.outrigger.SpaceProxy2.notify(SpaceProxy2.java:507)
        at Cliente.main(Cliente.java:33)
Caused by: java.rmi.UnmarshalException: unmarshalling method/arguments; nested e
xception is:
        java.lang.ClassNotFoundException: Calculadora2App.Resultado
        at net.jini.jeri.BasicInvocationDispatcher.dispatch(BasicInvocationDispa
tcher.java:619)
        at com.sun.jini.jeri.internal.runtime.ObjectTable$6.run(ObjectTable.java
:597)
        at net.jini.export.ServerContext.doWithServerContext(ServerContext.java:
103)
        at com.sun.jini.jeri.internal.runtime.ObjectTable$Target.dispatch0(Objec
tTable.java:595)
        at com.sun.jini.jeri.internal.runtime.ObjectTable$Target.access$700(Obje
ctTable.java:212)
        at com.sun.jini.jeri.internal.runtime.ObjectTable$5.run(ObjectTable.java
:568)
        at com.sun.jini.start.AggregatePolicyProvider$6.run(AggregatePolicyProvi
der.java:527)
        at java.security.AccessController.doPrivileged(Native Method)
        at com.sun.jini.jeri.internal.runtime.ObjectTable$Target.dispatch(Object
Table.java:565)
        at com.sun.jini.jeri.internal.runtime.ObjectTable$Target.dispatch(Object
Table.java:540)
        at com.sun.jini.jeri.internal.runtime.ObjectTable$RD.dispatch(ObjectTabl
e.java:778)
        at net.jini.jeri.connection.ServerConnectionManager$Dispatcher.dispatch(
ServerConnectionManager.java:148)
        at com.sun.jini.jeri.internal.mux.MuxServer$2.run(MuxServer.java:244)
        at com.sun.jini.start.AggregatePolicyProvider$5.run(AggregatePolicyProvi
der.java:513)
        at java.security.AccessController.doPrivileged(Native Method)
        at com.sun.jini.jeri.internal.mux.MuxServer$1.run(MuxServer.java:241)
        at com.sun.jini.thread.ThreadPool$Worker.run(ThreadPool.java:136)
        at java.lang.Thread.run(Thread.java:595)
Caused by: java.lang.ClassNotFoundException: Calculadora2App.Resultado
        at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
        at net.jini.loader.pref.PreferredClassLoader.loadClass(PreferredClassLoa
der.java:922)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:242)
        at net.jini.loader.pref.PreferredClassProvider.loadClass(PreferredClassP
rovider.java:613)
        at java.rmi.server.RMIClassLoader.loadClass(RMIClassLoader.java:247)
        at net.jini.loader.ClassLoading.loadClass(ClassLoading.java:138)
        at net.jini.io.MarshalInputStream.resolveClass(MarshalInputStream.java:2
96)
        at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:154
4)
        at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1466)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1
699)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
        at com.sun.jini.jeri.internal.runtime.Util.unmarshalValue(Util.java:221)

        at net.jini.jeri.BasicInvocationDispatcher.unmarshalArguments(BasicInvoc
ationDispatcher.java:1049)
        at net.jini.jeri.BasicInvocationDispatcher.dispatch(BasicInvocationDispa
tcher.java:599)
        ... 17 more
Pressione qualquer tecla para continuar. . .

My codes:

Cliente.java

import Calculadora2App.*;

import java.io.Serializable;
import java.util.Scanner;
import net.jini.space.JavaSpace;
import net.jini.core.lease.Lease;
import net.jini.core.event.RemoteEvent;
import net.jini.core.event.RemoteEventListener;
import java.lang.*;

public class Cliente{ //implements RemoteEventListener,Serializable{

 private JavaSpace space;

 public Cliente(){}

 public Cliente(JavaSpace space){
  this.space = space;
  }

 public static void main(String[] args){

 try {
  // ************* Fazendo Lookup para achar o espaço ***********************

  Utilidades conexao = new Utilidades();
  JavaSpace space = conexao.conecta();
  Cliente setar = new Cliente(space);

  // ************** Registrando cliente para receber notificação de
resultado **************

  Resultado usuario = new Resultado(space);
  Resultado template = new Resultado();
  space.notify(template, null,usuario, Lease.FOREVER, null);
   //
***************************************************************************************

  Scanner sc = new Scanner(System.in);
        CalcEntry msg = new CalcEntry(); // Entry de requisição de calculos


   System.out.println("************************************************\n");
   System.out.println("Digite o numero da operacao desejada:\n");
   System.out.println("1. Adicao\n");
   System.out.println("2. Subtracao:\n");
   System.out.println("3. Multiplicacao\n");
   System.out.println("4. Divisao\n");
   System.out.println("************************************************\n");


//****************************************************************************************


  msg.operacao = new Integer(sc.nextInt());
  System.out.println("Digite o primeiro numero: ");
  msg.op1 = new Integer(sc.nextInt());
  System.out.println("\nDigite o segundo numero:");
  msg.op2 = new Integer(sc.nextInt());

  //****************************** Usando write para escrever no espaço
*********************
  conexao.escreve(msg,space);

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

Resultado.java

import net.jini.core.lease.Lease;
import net.jini.core.event.RemoteEvent;
import net.jini.core.event.RemoteEventListener;

public class Resultado implements Entry,RemoteEventListener,Serializable {
 public Integer resultado;
 private JavaSpace space;

 public Resultado(){}
 public Resultado(JavaSpace space){
  this.space = space;
 }

 public void notify(RemoteEvent evento){

  System.out.println("Evento recebido. Tentando retirar do espaco........\n");

  Resultado resulEntry = new Resultado();

  //loop para tirar todas as entrys do espaço
  while(resulEntry == null){
   try{
   resulEntry = (Resultado)space.take(resulEntry,null,Long.MAX_VALUE);
   System.out.println("\nResultado da operacao:
"+resulEntry.resultado.intValue());
   }
  catch(Exception e){
   System.err.println("Erro ao retirar do espaço\n");
   e.printStackTrace();
  }
 }
  }
 }

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