Pluto and Struts

Hello,

I am trying to include this struts-sample into my running pluto portal  
2.0 / tomcat installation without using jetty .
http://struts.apache.org/2.x/docs/struts-2-portlet-tutorial.html

After building and deploying the project Pluto dosen't recognize it  
as  a portlet, however it can be accessed through the normal tomcat  
deployment path , of course without the portlet context.

Is there further configuration necessary when using a struts portlet  
in Pluto ?

thanks
-christian