Struts2 + JFreeChart Plugin + HttpServletRequest

[Kate Fox]

My JFreeChart action class implements ServletRequestAware, but 
setServletRequest is not being called.

Here is my definition from struts.xml:
      <package name="chart" extends="jfreechart-default">
       <action name="Graph" class="mypackage.Graph">
           <result name="success" type="chart">
               <param name="width">650</param>
               <param name="height">500</param>
           </result>
       </action>
   </package>

How can I get a HttpServletRequest object in my action?

Thanks for your help,

Kate