Why different default FilterDispatcher?

[raj malhotra]

Hi
I am learning strtus2 from struts2 in action book.I see default filter class as

org.apache.struts2.dispatcher.FilterDispatcher

But when i use Myeclipse to generate struts2 project, i see different class declared in the web.xml i.e.
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter

Why is different declarations?Are they specific to struts2 version.In case yes what is there functional difference?

[Ankit Garg]

Checkout the documentation of FilterDispatcher class, it says

Deprecated. Since Struts 2.1.3, use StrutsPrepareAndExecuteFilter instead or StrutsPrepareFilter and StrutsExecuteFilter if needing using the ActionContextCleanUp filter in addition to this one

David must know the exact reason why it has been deprecated (I didn't knew that it was deprecated so don't know the reason as well )...