Object Encoder/Decoder Web Site Files HTML, CSS, JS, Image Files File/Default Handler UserDao PersonDao EventDao AuthTokenDao … Data Access DB RegisterResult register(RegisterRequest r) Register Handler register Register Service Main server class login LoginResult login(LoginRequest r) Server Login Handler Login Service User table Person table Event table AuthToken table … clear ClearResult clear() Clear Handler Clear Service Model User Person Event AuthToken … fill FillResult fill(FillRequest r) Fill Handler Fill Service Web … … Object Encoder/Decoder Encodes objects in JSON format Decodes objects from JSON format Client App