How to load data of home page in spring mvc - ajax

Question

I have home page which contains features like city,country,states, user details and some pie charts and diagrams representing the data anlysis of the user.I am new to spring mvc I am in a confusion whether I should load the data of home page in one go or I should have onclick calls which would call to my controllers and load the data.
Example:
MyController Class
public class HomeController {
#Autowired
private EngagaementService engagaementService;
#Autowired
private EmployeeService employeeService;
#Autowired
private CgOfficeDetailsService cgOfficeDetailsService;
#RequestMapping("/")
public ModelAndView handleRequest() {
List<EmployeeInfo> listEmployees = employeeService.listEmployeeInfos();
ModelAndView model = new ModelAndView("index");
model.addObject("emp", listEmployees);
model.addObject("empCount", listEmployees.size());
return model;
}
#GetMapping("/getCity")
public ModelAndView getBU(HttpServletRequest request) {
String country = "India";
List<String> buList = employeeService.getCityName(country);
ModelAndView model = new ModelAndView("index");
model.addObject("buList", buList);
return model;
}
#GetMapping("/getState")
public ModelAndView getState(HttpServletRequest request) {
String country = "UP";
List<String> buList = employeeService.getState(country);
ModelAndView model = new ModelAndView("index");
model.addObject("buList", buList);
return model;
}
#GetMapping("/getUsers")
public ModelAndView getUsers(HttpServletRequest request) {
String country = "UP";
List<String> buList = employeeService.getState(country);
ModelAndView model = new ModelAndView("index");
model.addObject("buList", buList);
return model;
}

Answer 1

It's a question of permissions. I'd like to design my app architecture so that all the data that is accessible with current / particular authorization level (so to speak) is available on demand.
And if so, (I assume that's your case, since I don't see any further authentication in your code) it's only the question of your view design (frontend design).