If you want to try development with JSP, get Tomcat, that is the easiest way (go to jakarta.apache.org and follow the instructions)

If you want to do development on a non-internet box, it is fine.

If you want to host production sites on it then you probably want to either combine it with another web server (e.g. Apache), tune it up and secure it, or preferably both.

Anyway get it, run it, and JSP will work out of the box

Cheers
Slarty