1. SecurityConfig에 다음과 같이 추가 @Configuration @EnableWebSecurity @RequiredArgsConstructor public class SecurityConfig extends WebSecurityConfigurerAdapter { @Override protected void configure(HttpSecurity http) throws Exception { /* 중간 생략 */ http .sessionManagement() .sessionFixation().changeSessionId() .maximumSessions(1) .maxSessionsPreventsLogin(true) ; http.logout() .logoutRequestMatcher(new A..
