This action can be extended to use with HTML portlets. The service() method
calls response.setContentType("text/html;charset=UTF-8") so that
non-Latin1 languages render via UTF-8.
NOTE NOTE NOTE - this is used by non-Portal code... must remain
Extend this method and call super() first.
Assure that you return a non-null String representing the URL for the portlet.
Typically this is the name of the JSP without any path (e.g. "Foo.jsp").
In this class, this method returns null.