After several days of hard studying and hacking, I could discover how to use SPATIALITE from a Java class or less generically from a Java application.
I should really thank Taro L. Saito and A. Furieri for having helped me in accomplishing this important task for implementing my project for Google Summer Of Code 2010.
I propose you're reading a simple example for explaining how could I work with sqlite and spatialite from a sample java Class. I add also all the dependencies and other stuffs necessary for using it.
First of all you need to take provide yourself with the libraries you're going to use. They are:
1 - SQLiteJDBC : that's the java driver for using sqlite and its database files