My servlets not found the EJB

Hi,
I have a Servlet with the following code:
Hashtable env = new Hashtable();
env.put (Context.INITIAL_CONTEXT_FACTORY, "weblogic.jndi.WLInitialContextFactory");
env.put(Context.SECURITY_PRINCIPAL, "admin");
env.put(Context.SECURITY_CREDENTIALS, "adminmanager");
env.put(Context.PROVIDER_URL, "http://127.0.0.1:7007");
Context ctx = new InitialContext(env);
Object objref = ctx.lookup("Calc");
homecalc = (CalcHome)PortableRemoteObject.narrow(objref,CalcHome.class);
But when i execute the servlet by http://...
the server say java.lang.NullPointerException and not execute the EJB and finalize
the servlet normally.
what is bad?
Thanks in advance,
Juan Uribe.

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