"Cannot find symbol" error in the client code of an ejb application

Question

I am new to EJB and trying to develop an application to find sum of two numbers remotely.First,i created an interface and then the bean class and then the client. The interface Adder.java gets compiled but compiling the bean class AdderBean.java gives the following error.

C:\Users\Asad\Desktop\EJB>javac AdderBean.java
AdderBean.java:8: error: cannot find symbol
 class AdderBean implements Adder
                            ^
  symbol: class Adder
1 error

But i have declared the interface Adder.java ,then why it's giving this error.

Adder interface

import javax.ejb.Remote;

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

Bean Class Code

AdderBean.java

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.ejb.Stateless;
@Stateless(mappedName="myAdder")
 class AdderBean implements Adder
{
    @PostConstruct  
    public void init()
    {
        System.out.println("post create");

    }
    @PreDestroy
    public void destroy()
    {
        System.out.println("destroy");
    }
    public int add(int x,int y)
    {
        return x+y;
    }

}

Answer 1

There was problem with setting of classpath.Just before compiling these classes,i set the classpath to a jar file api.jar which was present in some other folder.That's why JVM wasn't able to find my interface Adder.java.Problem solved now.