SessionUtils.validSessionVerification(request, mapping);
	public ActionForward listClasses(		ActionMapping mapping,		ActionForm form,		HttpServletRequest request,		HttpServletResponse response)		throws Exception {		HttpSession session = request.getSession(false);				InfoExecutionPeriod infoExecutionPeriod = (InfoExecutionPeriod) session.getAttribute(SessionConstants.INFO_EXECUTION_PERIOD_KEY);				Integer curricularYear = (Integer) session.getAttribute(SessionConstants.CURRICULAR_YEAR_KEY);				InfoExecutionDegree infoExecutionDegree = (InfoExecutionDegree) session.getAttribute(SessionConstants.INFO_EXECUTION_DEGREE_KEY);						Object argsLerTurmas[] = { infoExecutionDegree, infoExecutionPeriod, curricularYear};		List classesList = (List) ServiceUtils.executeService(SessionUtils.getUserView(request),"LerTurmas", argsLerTurmas);				if (classesList != null && !classesList.isEmpty())			request.setAttribute(CLASS_LIST_KEY, classesList);		return mapping.findForward("listClasses");	}