Getting The bean 'authenticationManagerBuilder', defined in class path resource ... could not be registered - spring

Question

Im trying to implement authentication with Spring boot 3 like this :
#Configuration
#EnableWebSecurity
public class WebSecurityConfig {
#Bean
public PasswordEncoder passwordEncoder() {
return new BCryptPasswordEncoder();
}
#Bean
public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
http.authorizeHttpRequests((authz) -> authz
.requestMatchers("/webjars/**", "/resources/**", "/css/**", "/images/**").permitAll().anyRequest()
.authenticated()).formLogin((form) -> form.loginPage("/login").usernameParameter("email").permitAll())
.httpBasic(withDefaults());
return http.build();
}
#Bean
public UserDetailsService UserDetailsService() {
return new UserDetailsService();
}
public DaoAuthenticationProvider authenticationProvider() {
DaoAuthenticationProvider authenticationProvider = new DaoAuthenticationProvider();
authenticationProvider.setUserDetailsService(UserDetailsService());
authenticationProvider.setPasswordEncoder(passwordEncoder());
return authenticationProvider;
}
#Bean
public void authenticationManagerBuilder(AuthenticationManagerBuilder authConfiguration) throws Exception {
authConfiguration.authenticationProvider(authenticationProvider());
}
}
and getting this error :
*************************** APPLICATION FAILED TO START
Description:
The bean 'authenticationManagerBuilder', defined in class path
resource [com/test/admin/security/WebSecurityConfig.class], could not
be registered. A bean with that name has already been defined in class
path resource
[org/springframework/security/config/annotation/authentication/configuration/AuthenticationConfiguration.class]
and overriding is disabled.
Action:
Consider renaming one of the beans or enabling overriding by setting
spring.main.allow-bean-definition-overriding=true
from this document :
https://spring.io/blog/2022/02/21/spring-security-without-the-websecurityconfigureradapter
they've changed the WebSecurityConfigurerAdapter. so ive changed this :
#Override
public void configure(AuthenticationManagerBuilder auth) throws Exception {
return auth.getAuthenticationManager();
}
to this :
#Bean
public void authenticationManagerBuilder(AuthenticationManagerBuilder authConfiguration) throws Exception {
authConfiguration.authenticationProvider(authenticationProvider());
}
and now getting error.
also if i change it to this :
#Bean
public AuthenticationManager authenticationManager(AuthenticationConfiguration authConfiguration) throws Exception {
return authConfiguration.getAuthenticationManager();
}
my error goes away?!