How can I use CDI in my project

I'm using:

• Netbeans 8.0.2
• Tomcat 8.0.15
• Java EE 7 Web

I'm trying a simple loging.

I have a CDI aplication scoped managed bean "Aplicacion":

@Named
@ApplicationScoped
public class Aplicacion {
...

And I have a CDI session scoped managed bean "Loging":

@Named(value = "loging")
@SessionScoped
public class Loging implements Serializable {

@Inject
private Aplicacion aplicacion;

....

I want to inject aplicacion bean in Loging in order to store in the application scope the logged user (a requirement in my app is that a logged user can view the rest of the logged users). So in my class, when a user logged in, I do something like this:

aplicacion.addLoggedUser(user);

The problem is that the variable aplicacion is null, so I thing it is not being injected!

What I'm doing wrong?

Thanks