I have written my own mod-rewrite for Apache Tomcat which allows you to use clean urls to access your web application.
I am selling Single Site Commercial Licences for $1500 and Multi-Site Licenses for $2500.
Apache Tomcat runs better when requests are not proxied through mod_jk. My Tomcat mod-rewrite allows you to use Tomcat to serve your web application without Apache web server and still be able to take advantage of URL rewriting.
An example of a site that is currently using my Apache Tomcat Mod-Rewrite engine is www.myzot.com
You can visit my profile at www.myzot.com/scott which obviously uses my mod-rewrite to display my profile.
If you are interested in purchasing a license, feel free to contact me at 310.497.6688