Class cast exception in Ejb Look up

Question

Hi friends,
Deploying one ejb with JBoss_4_2_2_GA and deploying well.
But while trying to look up it getting some exception like
java.lang.ClassCastException: $Proxy78 cannot be cast to stateless.CalculatorRemote
please help to identify
here is code
Remote
package stateless;
import java.math.*;
import javax.ejb.Remote;
import java.lang.annotation.*;
@Remote
public interface CalculatorRemote {
public float add(float x, float y);
public float subtract(float x, float y);
public float multiply(float x, float y);
public float division(float x, float y);
and stateless bean
package stateless;
import java.math.*;
import javax.ejb.Stateless;
import javax.ejb.Remote; 
@Stateless(name="CalculatorBean")
@Remote(CalculatorRemote.class) 
public class CalculatorBean implements CalculatorRemote{
     public float add(float x, float y){     
          return x + y;
   public float subtract(float x, float y){
      return x - y;
    public float multiply(float x, float y){
      return x * y;
   public float division(float x, float y){
        return x / y;
and lookup code
public void jspInit() {
        try {
            InitialContext ic = new InitialContext();
               calculator = (CalculatorRemote) ic.lookup("example/CalculatorBean/remote");
               System.out.println("Loaded Calculator Bean");
        } catch (Exception ex) {
           e.printStackTrace ();
    }

Answer 1

hi i have gone through JNDI and
while calling look up from standard alone application, it will work fine
          InitialContext ctx = null;
          Hashtable<String, String> props = new Hashtable<String, String>();
          props.put("java.naming.factory.initial", "org.jnp.interfaces.NamingContextFactory");
          props.put("java.naming.factory.url.pkgs", "org.jboss.naming:org.jnp.interfaces");
          props.put("java.naming.provider.url", "jnp://localhost:1099");
          try {
               ctx = new InitialContext(props);
               CalculatorRemote calc = (CalculatorRemote) ctx.lookup("CalculatorBean/remote");
               System.out.println( "addition   ==   " + calc .add( 10, 20  ));
          } catch (NamingException e) {
               e.printStackTrace();
     when i am try to look up it from servlet following way but getting save error.
i have used following way
1. InitialContext ic = new InitialContext();
Object obj = ic.lookup( "CalculatorBean/remote" );
CalculatorRemote calc= ( CalculatorRemote )PortableRemoteObject.narrow ( obj, CalculatorRemote .class );
it getting following error
java.lang.ClassCastException
at com.sun.corba.se.impl.javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:229)
Caused by: java.lang.ClassCastException: $Proxy73 cannot be cast to org.omg.CORBA.Object
at com.sun.corba.se.impl.javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:212)
2. calculator = (CalculatorRemote) ic.lookup("CalculatorBean/remote");
java.lang.ClassCastException: $Proxy73 cannot be cast to forums.business.ForumManager
at forums.web.ForumServlet.init(ForumServlet.java:36)