Display users email when logged in (JSF 2.0)

My web app has a template that is used in all pages. I want to create a little label in that template (so it's visible everywhere) to display the email of the user if it's currently logged in.

I think the best way is to directly see if it exist on the session, so this is how I created the label:

<h:outputLabel id="usernameLabel"
               value="#{FacesContext.ge开发者_开发技巧tCurrentInstance().getExternalContext()
                      .getSessionMap().get("userRole")}" />

The code is not syntactically correct. How can I write it in the appropriate manner to achieve my goal? Do you think this approach is correct?

---

The better approach would be to store userBean in session containing the user's information.

and then

#{userBean.email}

Or you can directly attribute from session using jsp el

${userRole}

I would prefer first approach

Update

Upon successful login, set the frequently required in a ManagedBean for example

@ManagedBean
@SessionScoped
public class CurrentUserInfo{
  private String userName;
  private String firstName;
  private String lastName;
  //and some other like DOB and etc..
  //+accessor methods 
}

This would be alive and accessible through the session