EJB3.0开发无状态会话Bean问题

远程接口

@Remote
public interface Calculator {
 public int add(int x,int y);
} 

无状态Bean
public @Stateless class CalculatorBean implements Calculator{

               public int add(int x, int y) {

               return x+y;
               }

}

测试

public class Client {
    public static void main(String[] args) throws NamingException {

             InitialContext ict=new InitialContext();  
           //Calculator cal=(Calculator)PortableRemoteObject.narrow(cal1,Calculator.class);//这样对
  
            Calculator cal=(Calculator)ict.lookup("CalculatorBean/remote");//这样对

             //Calculator cal=(CalculatorBean)ict.lookup("src.com.liang.CalculatorBean"); //这样强制转化为Bean时错
            System.out.println("1 + 2 = "+cal.add(1,2));
  
 }

}