Nginx and Servlet

I would be gratefully if anybody could help...

How can I run on my website a "war" file? I know it requires a servlet. But I do not know how to set up one... I wish someone could tell me how to install a servlet on my nginx server, in order to play the war file on my website..

I appreciate your time, God bless you if you answer!!

Regards,
Frank

_______
PS) I have no knowledge from start to finish, so please give me a detailed answer! What I know is how to connect to my server through SFTP...