Exception in JSP: /homepage/course/courseResource_stu.jsp:61 58: } 59: }else{ 60: if(!lesson.checkGuestPerm(um.getID(), Lesson.LESSON_STUD_PERM_LMI_READ)){ 61: throw new JspException("您没有访问权限！"); 62: } 63: } 64: } Stacktrace:！