Как Spring понимает что вызов метода это не создание нового объекта, а bean?

@Configuration
@EnableWebSecurity
public class SecurityConfiguration {

    @Bean
    public InMemoryUserDetailsManager userDetailsService() {
        UserDetails user1 = User.withUsername("user1")
            .password(passwordEncoder().encode("user1Pass"))
            .roles("USER")
            .build();
        return new InMemoryUserDetailsManager(user1);
    }

    @Bean
    public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
        http.authorizeRequests()
            .anyRequest()
            .authenticated()
            .and()
            .formLogin()
            .failureHandler(authenticationFailureHandler())
        return http.build();
    }

    @Bean
    public AuthenticationFailureHandler authenticationFailureHandler() {
        return new CustomAuthenticationFailureHandler();
    }

    @Bean
    public PasswordEncoder passwordEncoder() {
        return new BCryptPasswordEncoder();
    }
}