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/UserDetailsServiceImpl.java

        package com.packtpub.springsecurity.service;
        ... omitted for brevity ...
        @Service
        public class UserDetailsServiceImpl
             implements UserDetailsService {
           @Autowired
           private CalendarUserRepository userRepository;
           @Override
           @Transactional(readOnly = true)
          public UserDetails loadUserByUsername(final String username) 
           throws UsernameNotFoundException {
            CalendarUser user = userRepository.findByEmail(username);
           Set<GrantedAuthority> grantedAuthorities...