If you want to run this version of the server on Tomcat 4 you will need
to deploy it, and then edit the webapps/biocore/WEB-INF/web.xml
and comment out the invoker servlet declaration (search for Tomcat).
We recommend, however, that you look at
our upgrade guide for upgrading from Tomcat 4 to Tomcat 5 as Tomcat 5
will be needed to take advantage of the changes in the new version of the
server.