How much has this Tomcat installation been modified from the original? As Ulf said, the standard installation has an index.jsp under ROOT - the first thing you should do after installing Tomcat is verify that this page displays.
I’ve looked at a lot of different solutions, and in my humble opinion Aspose is the way to go. Here’s the link: http://aspose.com
subject: HTTP Status 500 - No Context configured to process this request