rmi 调试出错 java.rmi.UnmarshalException: error unmarshalling arguments
我在网上下载一个学习rmi的例子程序，调试很长时间也没有没有调通，追后的错误如下：
Trobulett: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
我在此对程序做个说明：
我将所有的文件保存在D:\rmiDemo这个目录下面总共有四个java文件：
1）接口 Calculator.java
import java.rmi.Remote;
public interface Calculator extends 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;
}
2)接口的具体实现 CalculatorImpl.java

import java.rmi.server.UnicastRemoteObject;
public class CalculatorImpl extends UnicastRemoteObject implements Calculator{
  //这个实现必须有一个显示的构造函数，并且要抛出一个RemoteException异常
  public CalculatorImpl() throws java.rmi.RemoteException {
  super();
  }  
  public long add(long a,long b) throws java.rmi.RemoteException {
  return a+b;
  }  
  public long sub(long a,long b) throws java.rmi.RemoteException {
  return a-b;
  }  
  public long mul(long a,long b) throws java.rmi.RemoteException {
  return a*b;
  }  
  public long div(long a,long b) throws java.rmi.RemoteException {
  return a/b;
  }
}
3)客户端 CalculatorClient.java
import java.rmi.Naming;
import java.rmi.RemoteException;
import java.net.MalformedURLException;
import java.rmi.NotBoundException;

public class CalculatorClient{
  public static void main(String[] args){
  try{
  Calculator c = (Calculator)Naming.lookup("rmi://localhost/CalculatorService");
  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( 
  "java.lang.ArithmeticException");  
  System.out.println(ae);  
  } 
  }
}
4)主机服务器 CalculatorServer.java

import java.rmi.Naming;
//一个服务器类
public class CalculatorServer{
  public CalculatorServer(){
  try{
  Calculator c = new CalculatorImpl();
  Naming.rebind("rmi://localhost:1099/CalculatorService",c);