Primefaces Component not updating using RequestContext - ajax

Question

I am trying to update a primefaces component after the 'isAdmin' value changes.
I am using the following HTML page:
<h:form id="form">
<p:tabView id="tabs">
...
<p:tab title="Admin" rendered="#{userSession.isAdmin}">
...
</p:tab>
</p:tabView>
</h:form>
My UserSession class:
#ManagedBean(name="userSession")
#SessionScoped
public class UserSession {
.
.
.
public boolean isAdmin;
public UserSession() {
isAdmin = false;
}
public void addRole(String role) {
if (role.equals("ADMIN") {
this.isAdmin = true;
}
role.add(role)
}
}
The addRole() method gets called and adds the role "ADMIN". I know this isn't a good way of doing things, but I'm only using it for testing purposes at the moment.
Then, under the class where I handle login and the addRole() method gets called, I am trying to update the component using:
RequestContext.getCurrentInstance().update("form");
I have been trying to update the form as I believe this is always visible in the DOM?
My issue is, is that this is simply not working and nothing is being updated.
Any help is greatly appreciated.

Answer 1

I figured out that I was always actually changing my UserSession object instead of the actual session bean itself.
Therefore, I did the following and just pointed to my bean instead:
// Previously
// UserSession us = new UserSession();
UserSession us = (UserSession) FacesContext.getCurrentInstance().getExternalContext().getSessionMap().get("userSession");