We are using jspc ant task to pre-compile JSP files into classes/(then package into war)
Now we are switching to Jetty 8. According to the doc, there exists a maven
Its best if you use the JSP libs that comes with the jetty distribution.
Here's an example, using jetty-distribution-8.1.5.v20120716
Update: April 8, 2013
Pushed an example project with this build to github.
https://github.com/jetty-project/jetty-example-jspc-ant