Service Locator & Business Delegate Design Patterns for an EJB Client

HelloClient.java - This is the EJB Client class

package info.icontraining.ejb.client;

public class HelloClient {
 
   public static void main(String[] args) {  
      System.out.println(MyBusinessDelegate.sayHello("Dinesh"));
   }
}

MyBusinessDelegate.java

package info.icontraining.ejb.client;

import java.util.Hashtable;
import javax.naming.*;

public class MyBusinessDelegate {

   public static String sayHello(String name) {

      Object obj = MyServiceLocator.getStub("MyEarApp/" 
                  + HelloUserBean.class.getSimpleName() + "/remote");
  
      HelloUser helloUser = (HelloUser) obj;
      return helloUser.sayHello(name);
   }
}

MyServiceLocator.java

package info.icontraining.ejb.client;

import java.util.Hashtable;
import javax.naming.*;

public class MyServiceLocator {

   public static Object getStub(String jndiName) {
  
      Hashtable env = new Hashtable(); 
      env.put("java.naming.factory.initial",
            "org.jnp.interfaces.NamingContextFactory");
      env.put("java.naming.factory.url.pkgs",
            "org.jboss.naming:org.jnp.interfaces"); 
      env.put("java.naming.provider.url","localhost:1099"); 

      Context context;
      Object obj = null;
     
      try {
         context = new InitialContext(env);
         obj = context.lookup(jndiName);
      } catch (NamingException e) {
         e.printStackTrace();
      }

      return obj;
   }
}