I already told you in your previous thread that it is related to Maven, don't pretend that all of a sudden you have forgotten that in order to completely ignore everything I told you there. If you want to know how it works, read the manual or a book.
You've already been advised in several related threads to study a tutorial and buy a book. Your present learning process of asking one question at a time on a forum is about as inefficient and inappropriate as it could possibly be. Locking this thread.