REST on Apache Tomcat

I have the problem with the deployment of my Rails application on
Tomcat. The first problem is that I was not able to use the
acts_as_ferret plugin when creating the war file. I always got an "IO
error -- ferret". Then I eliminated the plugin and I was able to
create the war file. My problem now is that I created a REST
application with rails and if I want to access the resources I always
get a "Requested resource not available" error.
Has someone experienced the same problem? How can I resolve it?