INSTALLING mod_webapp is easy. CONFIGURING it is the pain, because as near as I can tell, they've completely changes the directives 3 times and updated the documentation at most twice. Anyway, mod_webapp goes in the same directory as all your other Apache modules. In RedHat 7, that's /etc/httpd/modules (alias /usr/lib/apache). I looked at my config files and all I saw were commented-out failures. I'd even looked at the mod_webapp source code! I did a quick search and found some complaining that mod_webapp doesn't work under win98. Very discouraging. On the bright side, the Jakarta site has an interesting alternative - use the Apache proxy module to redirect the request to Tomcat's main http port! http://jakarta.apache.org/tomcat/tomcat-4.0-doc/proxy-howto.html
An IDE is no substitute for an Intelligent Developer.