AppServer and WebServer..

If you have a WebServer and and Appserver
is it better to run the jsp engine on the appserver or on the webserver? Can you do this?

It's a trade off. Ed Roman addresses this question in table 14.1 of Mastering EJB 2.0. Did you download your free copy?

Thanks very much. I have not looked at Ed's book in a while but now that I do it is bringing up some great points. To be honest I am spinning my wheels on part II and needed some pointers to get going. I am finding it hard to actually put into practice the design patterns I had studied for part 1.

I am beginning to feel enlightened but here goes..
In 99 % of cases a 3 tier architecture makes sense and
In specifically if a client you are architected a system for wanted to put money into N web servers and only one app server it would be realistic to advise said client to go with only one web server machine and put the money used to purchase the web server machines into another app server?

Especially with the advent of local interfaces, Roman recommends that you have one web container and one EJB container per JVM per machine.