Question

I have a SessionScoped bean say UserSession which holds a String property token which acts as a authenticated token for the logged in user. This token is injected into other SessionScoped and ViewScoped beans so that they can consume this token and perform stuff. I have no problems injecting the property.

However, there’s a use case wherein the token in the UserSession itself is replaced by a different String. And once I do this, the other beans still refer to the old value of the token which results in invalid access.

How can I notify the other beans of this value change? or do I retrieve bean instance through

FacesContext context = FacesContext.getCurrentInstance();
Application app = context.getApplication();
UserSession session = (UserSession) app.evaluateExpressionGet(context, "#{userSession}", UserSession.class);

And then retrieve token as session.getToken()?
I’m using Mojarra 2.0.4

Answer 1

I don’t see why that is a problem. This more sounds like as if you’re copying the property like as:

@ManagedBean
@SessionScoped
private OtherBean {

    @ManagedProperty(value="#{userSession}")
    private UserSession userSession;

    private String token;

    @PostConstruct
    public void init() { 
        this.token = userSession.getToken();
    }

    public void someAction() {
        doSomethingWith(token);
    }

    public void otherAction() {
        doSomethingElseWith(token);
    }

    // ...
}

while you should rather be accessing it directly:

    // ...

    public void someAction() {
        doSomethingWith(userSession.getToken());
    }

    public void otherAction() {
        doSomethingElseWith(userSession.getToken());
    }

    // ...

Fix your beans accordingly to get rid of the private token property which contains the copy and just let all methods get it from the injected bean directly.