SessionUtils.validSessionVerification(request, mapping);
	public ActionForward execute(		ActionMapping mapping,		ActionForm form,		HttpServletRequest request,		HttpServletResponse response)		throws Exception {		HttpSession session = request.getSession(false);		DynaValidatorForm chooseCourseForm = (DynaValidatorForm) form;				InfoExecutionPeriod infoExecutionPeriod = (InfoExecutionPeriod) session.getAttribute(SessionConstants.INFO_EXECUTION_PERIOD_KEY);		List infoCourseList = SessionUtils.getExecutionCourses(request);			String courseInitials = (String) chooseCourseForm.get("courseInitials");		if (courseInitials != null && !courseInitials.equals("")) {			InfoExecutionCourse infoCourse = new InfoExecutionCourse();						infoCourse.setInfoExecutionPeriod(infoExecutionPeriod);			infoCourse.setSigla(courseInitials);						int index = infoCourseList.indexOf(infoCourse);			infoCourse = (InfoExecutionCourse) infoCourseList.get(index);			session.setAttribute(				SessionConstants.EXECUTION_COURSE_KEY,				infoCourse);			return mapping.findForward("forwardChoose");		} else {			return mapping.findForward("showForm");		}	}