Possible to add custom action class to existing xwiki struts framework

Hi there, I wonder if it possible to add my own action classes. The action class runs fine in its own context. Then action class is added to the WEB-INF/classes and the struts-config.xml is updated to reference the class. (Of course I re-started the Tomcat) However I get an "Invalid path was requested" error when I reference the action in the /xwiki/bin/ context. Also I wonder if this is doable in xwiki. The xwiki uses struts. But can people add their own custom action class to it. Thanks. Howard Yeung