Apache tomcat configure to "see" site


I want Apache Tomcat to be able to “see” my site… Whereas when I store a website folder under /srv/www/htdocs/ (for example /srv/www/htdocs/MYSITE) and change permissions it’s visible immediately, when I do the same in /srv/www/tomcat5/base/webapps/ROOT/MYSITE , even if I make the folder have 777 permissions, i get the response:

Object not found!

The requested URL was not found on this server. If you entered the URL manually please check your spelling and try again.

Must I specify something for Apache tomcat to see this new folder? And where? In some configuration file maybe?