Exception in JSP: /jpk/course/layout/sch/notice.jsp:37 34: //传参 35: Long nLessID = (Long) session.getAttribute("lid"); 36: if (nLessID == null) { 37: throw new Exception(appContext.getMessage("error.info.classification.import", null, request.getLocale())); 38: } 39: ElaCourseService service = (ElaCourseService) ZyAppContext.getBean("elaCourseService"); 40: ElaCourse course = service.findElaCourse(nLessID); Stacktrace:！