Since everyones already covered the Jetty side of it, I personally like Freemarker as a templating language.

http://freemarker.sourceforge.net/

It's pretty simple and straigtforward, its what I use instead of JSP.

Also, if you're doing web stuff, I HIGHLY recommend sitemesh.

http://www.sitemesh.org/

It's a really clean way of implementing layouts and everytime I use other languages like Python, I always try and find equivalents but am always disappointed.