I can't lookup EJB (3.0) in WebLogic 12 using ENC

Question

I have a simple application divided in 2 modules:
HolaMundo - Servlet component
SimpleEJB - EJB Component
The EJB Component use EJB 3.0. I created a local business interface with one method. A stateless EJB that implement that interface. And I use the ejb-jar.xml for declare it.
And a Servlet that use the EJB.
In Glassfish or Tomee this way for working with EJB works, but i don't understand why it doesn't work in WebLogic 12...
When i try to access to the servlet, i get an error. this is the error:
javax.naming.NameNotFoundException: While trying to look up /app/SimpleEJB/Example!com.edwin.ejb.ExampleLocal in /app/webapp/HolaMundo.war/1051995086.; remaining name '/app/SimpleEJB/Example!com/edwin/ejb/ExampleLocal'
  at weblogic.jndi.internal.BasicNamingNode.newNameNotFoundException(BasicNamingNode.java:1180)
  at weblogic.jndi.internal.ApplicationNamingNode.lookup(ApplicationNamingNode.java:146)
Servlet:
package servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.edwin.ejb.ExampleLocal;
public class EJB extends HttpServlet {
   private static final long serialVersionUID = 1L;
   @Override
   protected void doGet(HttpServletRequest arg0, HttpServletResponse arg1)
   throws ServletException, IOException {
   PrintWriter out = arg1.getWriter();
   ExampleLocal el2;
   try {
  el2 = (ExampleLocal) new InitialContext()
   .lookup("java:app/SimpleEJB/Example!com.edwin.ejb.ExampleLocal");
   out.println("EJBBBB: " + el2.nombre());
   } catch (NamingException e) {
  e.printStackTrace();
Local business interface:
package com.edwin.ejb;
public interface ExampleLocal {
    public String nombre();
EJB Stateless:
package com.edwin.ejb;
public class Example implements ExampleLocal{
    @Override
    public String nombre() {
        return "Edwin";
ejb-jar.xml:
<?xml version="1.0" encoding="UTF-8"?>
<ejb-jar version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/ejb-jar_3_0.xsd">
  <display-name>SimpleEJB </display-name>
  <enterprise-beans>
    <session>
        <ejb-name>Example</ejb-name>
        <business-local>com.edwin.ejb.ExampleLocal</business-local>
        <ejb-class>com.edwin.ejb.Example</ejb-class>
        <session-type>Stateless</session-type>
    </session>
  </enterprise-beans>
</ejb-jar>

Answer 1

Both answers did not work. I do not understand why it did not work because in other Java EE Servers it works.
My JNDI Tree (Screenshot):
http://oi58.tinypic.com/vs1jjd.jpg
However, i could get the EJB when i use the Global ENC, but i got a Casting Exception...
Eg:
try {
  ej = (EjLocal) new InitialContext().lookup("java:global.EjemploEJB.Ej!stateless.EjLocal");
  out.print("EJ: "+ej.ej());
} catch (NamingException e) {
  e.printStackTrace();
Output:
java.lang.ClassCastException: stateless.Ej_1aafe_EjLocalImpl cannot be cast to stateless.EjLocal
at servlet.Ejemplo.doGet(Ejemplo.java:33)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:731).....
There is a strange value in the EJB's JNDI Tree:
Header 1
Header 2
Binding Name:
java:global.EjemploEJB.Ej!stateless.EjLocal
Class:
stateless.Ej_1aafe_EjLocalImpl
Hash Code:
2021087981
toString Results:
stateless.Ej_1aafe_EjLocalImpl@78775aed