The UserDetailsService object

Let’s take a look at the following steps to add the UserDetailsService object:

1. Now, we need to add a new implementation of the UserDetailsService object; we will use our CalendarUserRepository interface to authenticate and authorize users again, with the same underlying RDBMS, but using our new JPA implementation, as follows:

   //com/packtpub/springsecurity/service/ CalendarUserDetailsService.java
   @Component
   public class CalendarUserDetailsService implements UserDetailsService {
   @Override
   public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
       CalendarUser user = calendarUserDao.findUserByEmail(username);
       if (user == null) {
           throw new UsernameNotFoundException("Invalid username/password.");
       }
       return new CalendarUserDetails(user);
    }
   }

2. Now, we have to configure...