In older versions of Tomcat, there was a mechanism called the InvokerServlet that would allow you to call servlets by package & classname from your URL. This feature has been disabled in recent versions.
Originally posted by Peter Bergoff: Does that look right?
Almost. You've got "/servlet" in your URL. You can either remove that from the URL or add it to your mapping. If you want to get a quick "Hello, World" servlet up and running in about 15 seconds download SimpleServlet.war from our CodeBarn to your tomcat/webapps directory.