@SuppressWarnings("serial")
public static void asGuest(String username) {
Guest guest = new Guest();
guest.username = username;
final FlxUserDetails loggedUser = new FlxUserDetails(guest);
// loggedUser.setDaylightSaving(false);
// loggedUser.setTzOffset(1.0f);
Authentication authToken = new Authentication() {
public Collection<GrantedAuthority> getAuthorities() {return null;}
public Object getCredentials() {return null;}