Question

I am going through the article on JSF LifeCycles. I have the following doubt.

• In many phases, the Response Complete is happening. How it is happening in
  the middle of the life cycle. Can anyone explain it in detail?

Answer 1

Quoting from the JSF 2.0 spec:

The responseComplete() method, on the other hand, signals the JSF implementation that the HTTP response for this request has been completed by some means other than rendering the component tree, and that the request processing lifecycle for this request should be terminated when the current phase is complete. For example, an event listener that decided an HTTP redirect was required would perform the appropriate actions on the response object (i.e. calling ExternalContext.redirect()) and then call this method.

Calling ExternalContext.redirect(String) in a JSF servlet application causes a 302 response to be sent to the browser via the underlying API. In this case, it would be an error (or at least futile) to emit data in the response body, so ExternalContext.redirect(String) calls responseComplete().