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Here's my BookShop ( EJB project ) structure:

     - Book entity bean

     - Utenti entity bean ( in english: Users )

     - OperazioniUtenti stateless session bean ( in english: UsersOperations )

     - OperazioniLibri stateless session bean ( in english: BooksOperations )

     - Carrello stateful session bean ( in english: Cart )

     - AccessoUtente stateful session bean ( in english: UserAccess )

this is the code:

package bookshop.library.sessionbean;

import java.util.Iterator;

import java.util.List;

import javax.ejb.Stateless;

import javax.ejb.TransactionAttribute;

import javax.ejb.TransactionAttributeType;

import javax.persistence.EntityManager;

import javax.persistence.PersistenceContext;

import bookshop.library.entitybean.*;

@Stateless

public class OperazioniUtenti implements OperazioniUtentiLocal{

          @PersistenceContext

          EntityManager em;

          public static final String RemoteJNDIName =  OperazioniUtenti.class.getSimpleName() + "/remote";

          public static final String LocalJNDIName =  OperazioniUtenti.class.getSimpleName() + "/local";

          public OperazioniUtenti() {

          }

bla bla bla....

i have no problem in looking up it in my BookShop project ( inside AccessoUtente bean or in a simple testing java client )

Now again my somethingServlet inside my Web project:

package webinterface.servlet;

import java.io.IOException;

import java.io.PrintWriter;

import javax.naming.Context;

import javax.naming.InitialContext;

import javax.naming.NamingException;

import javax.servlet.RequestDispatcher;

import javax.servlet.Servlet;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import bookshop.library.entitybean.*;

import bookshop.library.sessionbean.*;

public class somethingServlet extends HttpServlet implements Servlet {

           static final long serialVersionUID = 1L;

           static Context context;

           static OperazioniUtenti opUser;

           static Utenti user;

          public somethingServlet() {

                         super();

          } 

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

                    try

                    {

                                   context = new InitialContext();

                                   System.out.println(OperazioniUtentiLocal.class.toString()); // print successfully INFO  [STDOUT] interface bookshop.library.sessionbean.OperazioniUtentiLocal

                                   opUser = (OperazioniUtenti) context.lookup("/BookShop/OperazioniUtenti/local");

                    } catch (NamingException e) {

                                   e.printStackTrace();

                    }

bla bla bla...

( ....I switched to Local from Remote....).

Lookup returns a null pointer because it can't find BookShop.

I read a lot about this problem but the best answer i found says to put my BookShop.jar inside MYWEBPROJECTPATH/WebContent/WEB_INF/lib and be sure to have it in the java build path of the web project ( that's what i did ). Here the links:

http://devpinoy.org/blogs/lamia/archive/2008/01/03/deploying-your-jar-with-your-war-in-eclipse.aspx

http://webcache.googleusercontent.com/search?q=cache:aIWml4XYWCEJ:java.sun.com/j2ee/verified/packaging.html+add+jar+to+war&cd=6&hl=it&ct=clnk&gl=it&lr=lang_en|lang_it&source=www.google.it