info.txt

// ===== Problems =====
**  series adding getting stackoverflow error country 18 and user 25
1. Player and User confusion bcz, User has already role of Player
2. form cannot set LocalDateTime directly, lombok is used for getter setter
3. @OneToMany and @JoinTable makes the inverse_column as unique
4. how to model.addAttribute in header.jsp


// ===== task list ======
1. javax.validation -----(done)
2. logger => (log4j dependency + log4j.properties) ----(done)
3. UI integration => (Best admin UI)------(done)
4. separate request / response model -----(done)
5. success / warning message show => (bootstrap alert) ---------------------------------------(X)
6. Proper business logic for urls => (Spring security)----- (done)
7. AOP => (Aspect Oriented Programming)---------------------------------------------------------(X)
8. Global exception handler => with ( error page 500 / 400/ 403 ) ----(done)
9. Image file, Video File, pdf File, doc file, excel file-------------------------------------(X)


// ===== information =====
1. for multiple bean we should use qualifier in @Autowired
2. Use update() if you are certain that the session does not contain an already persistent instance with the
same identifier. Use merge() if you want to merge your modifications at any time without consideration
of the state of the session. In other words, update() is usually the first method you would call in a
fresh session, ensuring that the reattachment of your detached instances is the first operation that
is executed.