HttpSession session = request.getSession(); session.removeAttribute(SessionConstants.INFO_SECTION);
HttpSession session = request.getSession(true);
	public ActionForward execute(		ActionMapping mapping,		ActionForm form,		HttpServletRequest request,		HttpServletResponse response)		throws Exception {							HttpSession session = request.getSession();		session.removeAttribute(SessionConstants.INFO_SECTION);		if (session != null) {			GestorServicos gestor = GestorServicos.manager();			InfoClass infoClass = new InfoClass();						InfoExecutionPeriod infoExecutionPeriod = (InfoExecutionPeriod) session.getAttribute(SessionConstants.INFO_EXECUTION_PERIOD_KEY);			InfoExecutionDegree infoExecutionDegree = (InfoExecutionDegree) session.getAttribute(SessionConstants.INFO_EXECUTION_DEGREE_KEY); 						Integer curricularYear=(Integer) session.getAttribute(SessionConstants.CURRICULAR_YEAR_KEY);						infoClass.setAnoCurricular(curricularYear);						infoClass.setInfoExecutionDegree(infoExecutionDegree);			infoClass.setInfoExecutionPeriod(infoExecutionPeriod);						Object argsSelectClasses[] = { infoClass };			List infoClasses =				(List) gestor.executar(					null,					"SelectClasses",					argsSelectClasses);						if (infoClasses != null && infoClasses.isEmpty()) {				session.removeAttribute("publico.infoClasses");			} else {				session.setAttribute("publico.infoClasses", infoClasses);			}			return mapping.findForward("Sucess");		} else			throw new Exception();		// nao ocorre... pedido passa pelo filtro Autorizacao	}