The Naming problem in my first ejb program.

Question

Dear experts,
I am new to Enterprise applications.
I am ,now, in my first step in developinf Enterprise Java bean.
I use Sun System Application Server.
The following s my very first code:
Hello.java (Remote interface)
import java.rmi.*;
import javax.ejb.*;
public interface Hello extends EJBObject{
     public void displayMessage() throws RemoteException;
HelloHome.java (Home interface)
import java.rmi.*;
import javax.ejb.*;
public interface HelloHome extends EJBHome{
     public Hello create() throws RemoteException,CreateException;
HelloBean.java (Bean Implementation class)
import java.rmi.*;
import javax.ejb.*;
public class HelloBean implements SessionBean{
     public void displayMessage(){
          System.out.println("Success..Success..SLK won atlast");
     public void ejbCreate(){
     public void ejbRemove(){
     public void ejbActivate(){
     public void ejbPassivate(){
     public void setSessionContext(SessionContext ct){
I did go thro the following steps:
1.I save all these files inside c:\MyEjb folder.
2.First I compile the following files with javac complier
     Hello.java,HelloHome.java and HelloBean.java
3.I open deploytool and created a Application HelloApplication.It gives me HelloApplication.ear file inside c:\MyEjb folder.
4.I created a bean jar into the HelloApplication.The bean jar created is Hello.jar.
5.Then I deploy HelloApplication with out checking/selecting the Return Client jar check box.
6.After the application is deployed, I select, from the tree view,LocalHost 4848.
I select HelloApplication from the deployed applications list, and click the Click Jar...button.It returns HelloApplicationClient.jar into c:\MyEjb folder.
Here goes my Client java file:
HelloClient.java
import javax.ejb.*;
import javax.naming.*;
import java.rmi.*;
import java.util.*;
public class HelloClient{
     public static void main(String s[]){
          try{
               Properties prop = new Properties();
               prop.put(javax.naming.Context.INITIAL_CONTEXT_FACTORY,"com.sun.jndi.fscontext.RefFSContextFactory");
               prop.put(javax.naming.Context.PROVIDER_URL,"file:c:\\");
               Context ctx = new InitialContext(prop);
               HelloHome hHome = (HelloHome)ctx.lookup("Hello");
               Hello hObj = hHome.create();
               hObj.displayMessage();
          }catch(Exception e){
               e.printStackTrace();
This also is in C:\MyEjb folder.
Now I compile HelloClient.java.
Then I tried to run HelloClient using java HelloClient
It just says javax.naming.NameNotFoundException:Hello
Why is this so? Does Sun App server uses any other naming service than FileSystem (fscontext) like CORBA Naming service COS Naming?If so I can download COS Naming provider and use that in my client code.
Is this correct way to run my client code? or should I go thro File->New->Application Client...etc and use appclient utility?
I tried that too and run using the command appclient -client HelloAppClient.jar -mainclass HelloClient
Again I get the same exception,javax.naming.NameNotFoundException:Hello.
I checked the JNDI Name for my HelloBean and its correctly set as 'Hello'.
Why is this error? Should I have any special folder structure to run EJB?
Help me resolve this.
Thanx in advance
unique

Answer 1

Try rewriting your Hello client like this:
import javax.ejb.*;
import javax.naming.*;
import java.rmi.*;
import java.util.*;
public class HelloClient
    public static void main(String s[])
        try
            Context initial = new InitialContext();
            Content myEnv   = (Context)initial.lookup("java:comp/env");
            Object o        = myEnv.lookup("ejb/Hello");
            HelloHome hHome = (HelloHome)PortableRemoteObject.narrow(o, HelloHome.class);
            Hello greeter   = hHome.create();
            greeter.displayMessage();
        catch(Exception e)
            e.printStackTrace();
}See if that's better.