A servlet filter is also provided along with a sample web.xml that maps that filter to all requests. This is only one way to use the load balancer. The user may configure multiple filters each with a different rule chain mapped to (possibly multiple) different url-patterns or servlets. It is also possible to use rule chains within a servlet.
Please note that although this application is being distributed with Tomcat, it is compliant with the Servlet Specification v2.3 and is therefore portable across servlet containers that support this specification.
The balancer webapps uses the Digester tool from Apache Commons. Digester and its dependencies are included in this distribution.
The balancer webapp uses 
Jalopy 
for source-code formatting and 
CheckStyle 
for source-code checking.
The 
CheckStyle Report is available.
Any suggestions, comments, etc, are welcome: please post them to the tomcat-user mailing list. Enjoy ;)