// Display Add Form For: Role
  @RequestMapping(value = "/add_role", method = RequestMethod.GET)
  public ModelAndView displayNewUser(HttpServletRequest request) {
    HttpSession sess = request.getSession();
    SessionHelper sh = new SessionHelper();
    ModelAndView model = null;

    // Get User Data Access Object to Manage Session User
    UserDAO userSessionDAO = new UserDAO();

    // Validate session
    if (!sh.isValidSession(sess)) {
      // If invalid session, redirect to login page
      model = new ModelAndView("login");
      // Set redirect back to new form for: Role
      model.addObject("redirectTo", "/add_role");
      // Error Message: Invalid session
      model.addObject("errmsg", "Invalid Session: Please log in.");
    } else {
      // Call Form View For: Role
      model = new ModelAndView("role_form");
      // Pass session user to View
      model.addObject("sessionUser", userSessionDAO.getSessionUser(sess));
      // Pass Operation of New
      model.addObject("operation", "new");
    }

    return model;
  }
  // Display Update Form For: Role
  @RequestMapping(
      value = "/upate_role",
      params = {"id"},
      method = RequestMethod.GET)
  public ModelAndView displayExistingUser(
      HttpServletRequest request, @RequestParam(value = "id") Integer id) {
    HttpSession sess = request.getSession();
    SessionHelper sh = new SessionHelper();
    ModelAndView model = null;

    // Get User Data Access Object to Manage Session User
    UserDAO userSessionDAO = new UserDAO();

    // Validate session
    if (!sh.isValidSession(sess)) {
      // If invalid session, redirect to login page
      model = new ModelAndView("login");
      // Set redirect back to existing form for: Role
      model.addObject("redirectTo", "/update_role?id=" + id.toString());
      // Error Message: Invalid session
      model.addObject("errmsg", "Invalid Session: Please log in.");
    } else {
      // Call Form View For: Role
      model = new ModelAndView("role_form");
      // Pass session user to View
      model.addObject("sessionUser", userSessionDAO.getSessionUser(sess));
      // Pass Operation of Update
      model.addObject("operation", "update");
    }

    return model;
  }
  // Display List For: Role
  @RequestMapping(
      value = "/role_list",
      params = {"query"},
      method = RequestMethod.GET)
  public ModelAndView displayList(
      HttpServletRequest request, @RequestParam(value = "query") String query) {
    HttpSession sess = request.getSession();
    SessionHelper sh = new SessionHelper();
    ModelAndView model = null;

    // Get User Data Access Object to Manage Session User
    UserDAO userSessionDAO = new UserDAO();

    // Get Data Access Object For: Role
    RoleDAO roleDAO = new RoleDAO();

    // Validate Session
    if (!sh.isValidSession(sess)) {
      // If invalid session, redirect to login page
      model = new ModelAndView("login");
      // Set redirect back to list for: Role
      model.addObject("redirectTo", "/role_list?query=" + query);
      // Error Message: Invalid session
      model.addObject("errmsg", "Invalid Session: Please log in.");
    } else {
      // Get ArrayList From Query For: Role
      ArrayList<Role> roleList = roleDAO.getListByQuery(query);
      // Update session user's personalized filter from the provided query for: Role
      userSessionDAO.updateUsersFilter("Role", query);

      // Call List View For: Role
      model = new ModelAndView("role_list");
      // Pass session user to View
      model.addObject("sessionUser", userSessionDAO.getSessionUser(sess));
      // Pass ArrayList to View For: Role
      model.addObject("roleList", roleList);
    }

    return model;
  }