Security 스프링부트 3.0 이후에 AuthenticationManager가 필요한 경우

[주인장]

* 로그인 처리를 위해 추가 

1. 빈 등록 

@Bean
public AuthenticationManager authenticationManager(AuthenticationConfiguration authenticationConfiguration) throws Exception {
    return authenticationConfiguration.getAuthenticationManager();
}

2. 매니저 등록 

@RequiredArgsConstructor

private final AuthenticationManager authenticationManager;

3. 로그인 처리
Authentication authentication = authenticationManager.authenticate(new UsernamePasswordAuthenticationToken(kakaoUser.getEmail(), kakaoUser.getPassword()));
SecurityContextHolder.getContext().setAuthentication(authentication);