Question

how to use FacesContext in JSF? please give me one whole example ? and some explantion when and at what condition we need to use this?

Answer 1

FacesContext gives you access to multiple useful contexts and objects, like:

• the Application object, containing application-related ‘settings’
• the external context, which is in most cases the ServletContext
• Various JSF UI objects, like the render kit, the UIViewRoot

You obtain it via FacesContext.getCurrentInstance(). After that – check the docs to see what can be of particular interest to you.

The FacesContext is initialized per each request, and getCurrentInstance() actually returns a ThreadLocal variable.

It is to be noted, that a simple application should be able to work without the need to access the FacesContext.