As already stated, spring manages the session for you. It stores the user data, roles etc. for you.
If you want to check that just Add the Principal as one your argument in your controller class. which is the currently logged in security user, for example:
@RequestMapping(value = {"/", "/welcome"}, method = RequestMethod.GET)
public String welcome(Model model, Principal principal) {
System.out.println(principal.getName());
return "welcome";
}
Altough if you want to refine this strategy and add your own logic, just follow this tutorial:
http://www.baeldung.com/spring-security-session