What this article does not show you is that you need to enable Tomcat's InvokerServlet. To do so, edit the web.xml file in your tomcat's conf directory (%TOMCAT_HOME%/conf/web.xml). Search the word "invoker" in this file.
1. You need to uncomment the invoker servlet 2. You need to uncomment the servlet mapping for the invoker I let you figure out where both sections are. If you look for the word "invoker", you'll find them both.