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Guest · Posted: Fri Feb 02, 2007 11:03 pm Post subject: JNDI, session beans and JBoss

I was trying the first EJB example of the book "Mastering Enterprise
Java Beans". After building the bean and deploying it successfully I
had many problems making the client work. The client code is very
simple

public class Main {
public static void main(String[] args) throws Exception{
Context ctx=new InitialContext();

Hello hello=(Hello)ctx.lookup("HelloBean");
System.out.println(hello.hello());
}
}

But I found many problems using the lookup method. Using the full
"path" for the interface "examples.session.stateless.Hello", as
specified in the book, I got

Exception in thread "main" javax.naming.NameNotFoundException:
examples.session.stateless.Hello not bound

Otherwise, using the line

Hello hello=(Hello)ctx.lookup("HelloBean");

I got the error

Exception in thread "main" java.lang.ClassCastException:
org.jnp.interfaces.NamingContext cannot be cast to
examples.session.stateless.Hello

So I think I was grabbing the wrong object from JBoss. Looking on many
posts and web pages I found that using

Hello hello=(Hello)ctx.lookup("HelloBean/remote");

I can get the right object. Why? It's really difficult for me to
understand the way JNDI is naming my resources...can you give me
informations about that? It would be really appreciated...

Cold

Per Newgro · Guest

Hallo cold80 (AT) libero (DOT) it,

Guest · Posted: Mon Feb 05, 2007 2:23 pm Post subject: Re: JNDI, session beans and JBoss

I didn't mentioned that my example is developed using EJB 3.0. Maybe
the container is defining the local and remote interfaces for me, but
I just define a interface as

package examples.session.stateless;

public interface Hello {
public String hello();
}

and a class implementation

package examples.session.stateless;

import javax.ejb.Stateless;
import javax.ejb.Remote;

@Stateless
@Remote(Hello.class)
public class HelloBean implements Hello{
public String hello(){
System.out.println("hello()");
return "Hello world!!!";
}
}

So, as you see, I'm not using ejb-jar.xml file to define the
informations needed by the container. Intead I'm writing annotations
on the code. Do you think I have to write the ejb-jar.xml file as
well? I mean, is it because I didn't write it that I can't access it?
Do you know where I can find informations about this matter on the
Internet (specific for Jboss, actually)?

Thank you again for your help

Cold

Per Newgro ha scritto:

Per Newgro · Guest

Hallo cold80 (AT) libero (DOT) it,