Java Programming

public ActionForward execute(ActionMapping mapping,
	                                 ActionForm form,
	                                 HttpServletRequest request,
	                                 HttpServletResponse response)
	        throws Exception {
	        StudentService service = new StudentService();
	        StudentForm studentForm = (StudentForm) form; //Error is shown here...
	        StudentDTO studentDTO = new StudentDTO();
	        BeanUtils.copyProperties( studentDTO, studentForm );
	        service.insertStudent( studentDTO );
	        request.setAttribute("employee",studentDTO);
	        return (mapping.findForward("success"));
	    }