(InfoExecutionDegree) session.getAttribute( SessionConstants.INFO_EXECUTION_DEGREE_KEY);
RequestUtils.getExecutionDegreeFromRequest( request, infoExecutionPeriod.getInfoExecutionYear());
	public ActionForward execute(		ActionMapping mapping,		ActionForm form,		HttpServletRequest request,		HttpServletResponse response)		throws Exception {											HttpSession session = request.getSession(true);		String className = request.getParameter("className");		if (className == null)			return mapping.getInputForward();		InfoExecutionPeriod infoExecutionPeriod =			(InfoExecutionPeriod) session.getAttribute(				SessionConstants.INFO_EXECUTION_PERIOD_KEY);		InfoExecutionDegree infoExecutionDegree =			(InfoExecutionDegree) session.getAttribute(				SessionConstants.INFO_EXECUTION_DEGREE_KEY);		InfoClass classView = new InfoClass();		classView.setInfoExecutionDegree(infoExecutionDegree);		classView.setInfoExecutionPeriod(infoExecutionPeriod);		classView.setNome(className);		Object[] args = { classView };		List lessons =			(List) ServiceUtils.executeService(null, "LerAulasDeTurma", args);				session.setAttribute(SessionConstants.CLASS_VIEW, classView);		session.setAttribute(SessionConstants.LESSON_LIST_ATT, lessons);		return mapping.findForward("Sucess");	}