HttpSession session = request.getSession(); session.removeAttribute(SessionConstants.INFO_SECTION);
HttpSession session = request.getSession(true);
	public ActionForward executionCourseViewer(		ActionMapping mapping,		ActionForm form,		HttpServletRequest request,		HttpServletResponse response)		throws Exception {				HttpSession session = request.getSession();		session.removeAttribute(SessionConstants.INFO_SECTION);		String exeCourseCode = null;				exeCourseCode = (String) request.getParameter("exeCourseCode");		if (exeCourseCode== null){			exeCourseCode = (String) request.getParameter("exeCode");		}		return executionCourseViewerSelectedByInitials(			mapping,			form,			request,			response,			exeCourseCode);	}