Source code that throws exception

package programmaticlogintest;

import com.sun.appserv.security.ProgrammaticLogin;
import javax.naming.InitialContext;
import demo.CalculatorRemote;
import java.util.Hashtable;
import javax.naming.NamingException;
import javax.rmi.PortableRemoteObject;


public class Main {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) throws NamingException {


        System.out.println("Hello World!");

        ProgrammaticLogin pm = new ProgrammaticLogin();
        pm.login("endasil", "hej123"); //user and password of a user mapped to admin role

        //corbaname:iiop:myhost.mycompany.com:9810/NameServiceServerRoo
        // Initial environment with various properties
        Hashtable env = new Hashtable();


        env.put("java.naming.factory.initial", "com.sun.enterprise.naming.SerialInitContextFactory");
        env.put("java.naming.factory.url.pkgs", "com.sun.enterprise.naming");
        env.put("java.naming.factory.state", "com.sun.corba.ee.impl.presentation.rmi.JNDIStateFactoryImpl");
        env.put("java.naming.provider.url", "localhost");
        env.put("org.omg.CORBA.ORBInitialHost", "127.0.0.1");
        env.put("org.omg.CORBA.ORBInitialPort", "3700");
        InitialContext ctx;

        try {
             javax.swing.JOptionPane.showMessageDialog(null, "before InitialContext");

            @h@ ctx = new InitialContext(env);  <--- Exception is thrown by this one here!!

	   javax.swing.JOptionPane.showMessageDialog(null, "After initialContext");
            Object ref = ctx.lookup("demo.CalculatorRemote");
            javax.swing.JOptionPane.showMessageDialog(null, "Afterctx.lookup");
            CalculatorRemote calc = (CalculatorRemote) PortableRemoteObject.narrow(ref, CalculatorRemote.class);
            javax.swing.JOptionPane.showMessageDialog(null, "2 + 2 = " + calc.add(2, 2));



          //  javax.swing.JOptionPane.showMessageDialog(null, calc.hello("Mr Demo"));
        } catch (Exception ex) {

            javax.swing.JOptionPane.showMessageDialog(null, "Exception" +ex.toString());
        }
    }
}