How to get IPortalComponentRequest Object?

Hello all,
I need to get a handle on the IPortalComponentRequest Object for the following code. A direct cast from HttpServletRequest to PortalComponentRequest throws a classcast exception. Is there any way I can get to know the name of the WD iview and its location in the pcd?
     NavigationEventsHelperService navHelperService = (NavigationEventsHelperService) WDPortalUtils.getServiceReference(NavigationEventsHelperService.KEY);
          IPortalComponentRequest request = (IPortalComponentRequest) httpRequest;
          INavigationNode navTargetNode = navHelperService.getCurrentNavNode(request);
Thanks for your time,
Raj Balakrishnan

Hi Lohi,
I didn't found the com.sap.ep.applicationdevelopment jar.
I add the servlet.jar, but I think U didn't understand my problem.
I work now on Web Dynpro Project, So I don't know how to handle the request object.
Usually when I work on DynPage Project I handle the request object from the parent Object:<b> IPortalComponentRequest request = (IPortalComponentRequest) this.getRequest();</b>
Thanks,
Maya.

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