[For beginners] How to deploy J2EE website on your own server

background
you may want to deploy your own website using J2EE, so people could have access to it.
in this case, this article will show you how to do it.

essentials
a running server (or VPS, which you could deploy tomcat or jetty on it)
a JDBC compatible database (mysql, sql server, postgresql or oracle)
WAR package of your website
(optional) a top-level domain

how to
I. deploy tomcat/jetty on your server
setup jre:
[jre7] http://www.oracle.com/technetwork/java/javase/downloads/java-se-jre-7-download-432155.html

get tomcat/jetty package here:
[jetty] http://download.eclipse.org/jetty/stable-9/dist/
[tomcat] http://tomcat.apache.org/download-80.cgi

II. deploy webapp (WAR package)
put your war package in the webapps directory of jetty/tomcat.

III. get it running
tomcat:
sh tomcat/bin/catalina.sh

jetty:
sh jetty/bin/jetty.sh start

it works.