SpringMVC UserDetailsService login - spring

Question

I have this class:
#Service
public class AppUserDetailsService implements UserDetailsService {
#Autowired
private UserRepository userRepository;
#Override
public UserDetails loadUserByUsername(String email) throws UsernameNotFoundException {
Optional<User> optionalUser = userRepository.findByEmailAndStatus(email, UserStatusEnum.ACTIVE);
User user = optionalUser.orElseThrow(() -> new UsernameNotFoundException("Usuário e/ou senha incorretos"));
return new UserSystem(user, getPermissoes(user));
}
private Collection<? extends GrantedAuthority> getPermissoes(User user) {
Set<SimpleGrantedAuthority> authorities = new HashSet<>();
user.getPermitionList().forEach(p -> authorities.add(new SimpleGrantedAuthority(p.getCode().getDescription().toUpperCase())));
return authorities;
}
}
My html form:
<form name="login" method="POST" th:action="#{/login}">
<div class="form-group">
<input type="email" class="form-control input-lg" id="email" placeholder="Email" name="email"
required="required"/>
</div>
<div class="form-group">
<input type="password" class="form-control input-lg" id="password" placeholder="Senha" name="password"
required="required"/>
</div>
<div class="btn-group btn-group-justified" role="group">
<div class="btn-group" role="group">
<button type="button" class="btn btn-danger" onclick="showUserForm()">Cadastar</button>
</div>
<div class="btn-group" role="group">
<button type="submit" class="btn btn-default">Entrar</button>
</div>
</div>
<button type="button" class="btn btn-link wimoo-link">Esqueceu sua senha?</button>
</form>
My login Bean:
#GetMapping("/login")
public ModelAndView login(#AuthenticationPrincipal User user) {
ModelAndView mv = new ModelAndView("login");
mv.addObject(new User());
if (user != null) {
mv = new ModelAndView("masterdata/home");
return mv;
}
return mv;
}
The problem is, the User in my method 'public ModelAndView login(#AuthenticationPrincipal User user)' is always null. The method loadUserByUsername is ok, but in my bean the user is always null.

Answer 1

You are missing a few things. You are not binding your form details to your user in the login method. In order to do the binding do this:
On your form you have:
<div class="form-group">
<input type="email" class="form-control input-lg" id="email" placeholder="Email" name="email" required="required"/>
</div>
if you want to bind this email from your form to the email field on your User object, then if on the User class you have:
public class User{
private String myEmailAddress;
}
then on your input tag, you should add a name attribute that equals to myEmailAddress in order to bind that value from your form to your User object on your login method.
<div class="form-group">
<input type="email" name="myEmailAddress" class="form-control input-lg" id="email" placeholder="Email" required="required"/>
</div>
All you need to do now is to add the #ModelAttribute annotation to your login method in order to actually do this binding. Like this:
#GetMapping("/login")
public ModelAndView login(#AuthenticationPrincipal #ModelAttribute User user) {
ModelAndView mv = new ModelAndView("login");
mv.addObject(new User());
if (user != null) {
mv = new ModelAndView("masterdata/home");
return mv;
}
return mv;
}