JSP's work but Tomcat seems to be down?

I've installed jsp-4.x fine on my server but I have 1 problem - if a site which has JSP's enabled and also has the index.jsp file within the folder - the index.jsp file does not get show by default - even though I have added the index.jsp to the DirectoryIndex in httpd.conf -is there any other files it would have to be added into?
Also when looking via WHM for the server status Tomcat_JSP seems to be down / failed - even after I have rebooted / restarted the service - altho if I goto a jsp file it works correctly
Any ideas?
Thanks