private void fetchSubscribedCategoryList(HttpSession session) {
		StudentBean bean = (StudentBean)session.getAttribute("person");
		StudentDao dao=new StudentDao();
		HashMap<String, Boolean> categoryMap = new HashMap<String, Boolean>();
		List<String> nonSubscribed = dao.fetchCategories(bean.getUserid(), "NotSubscribed");
		List<String> subscribed = dao.fetchCategories(bean.getUserid(), "subscribed");
		for(String val:nonSubscribed){
			categoryMap.put(val, false);
		}
		for(String val:subscribed){
			categoryMap.put(val, true);
		}
		session.setAttribute("categoryMap", categoryMap);
	}