Computer scienceBackendSpring BootSpring Security

Custom User Store

Improperly implemented UserDetailsService

Report a typo

The code below is an implementation of UserDetailsService. Your task is to study the code and find a mistake.

Java

@Service
public class UserDetailsServiceImpl implements UserDetailsService {
    @Autowired
    UserRepository userRepo;

    @Override
    public AppUser loadUserByUsername(String username) throws UsernameNotFoundException {
        AppUser user = userRepo.findUserByUsername(username);

        if (user == null) {
            throw new UsernameNotFoundException("Not found: " + username);
        }

        return user;
    }
}

Kotlin

@Service
class UserDetailsServiceImpl(
    val userRepo: UserRepository
) : UserDetailsService {

    override fun loadUserByUsername(username: String): AppUser {
        return userRepo.findUserByUsername(username) ?: throw UsernameNotFoundException("Not found: $username")
    }
}

The AppUser class doesn't implement any interface.

Select one option from the list

The loadUserByUsername method must return UserDetails.

The loadUserByUsername method must receive UserDetail.

UserDetailsServiceImpl must implement UserDetails.

The name of the exception must be UserNotFoundException.

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