Spring Security: Global AuthenticationManager without the WebSecurityConfigurerAdapter

Question

Im trying to get rid of WebSecurityConfigurerAdapter. The AuthenticationManager is configured like the following:

@Configuration
@EnableGlobalMethodSecurity(prePostEnabled = true)
public static class DefaultSecurityConfig extends WebSecurityConfigurerAdapter {

    @Override
    @Bean
    public AuthenticationManager authenticationManager() throws Exception {
        return super.authenticationManager();
    } 
 

  @Override
  protected void configure(AuthenticationManagerBuilder auth) 
  throws Exception {
            auth.userDetailsService(userDetailsService())
                    .passwordEncoder(passwordEncoder());
        }

Now without the WebSecurityConfigurerAdapter i define the global AuthenticationManager like this:

    @Configuration
    @EnableGlobalMethodSecurity(prePostEnabled = true)
    public static class DefaultSecurityConfig  {

        @Bean
        public AuthenticationManager authenticationManager(AuthenticationManagerBuilder auth ) throws Exception {
            return auth.userDetailsService(userDetailsService())
                    .passwordEncoder(passwordEncoder()).and().build();
        }

And i get the error:

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'org.springframework.security.config.annotation.web.configuration.WebSecurityConfiguration': Unsatisfied dependency expressed through method 'setFilterChains' parameter 0; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'defaultSecurityFilterChain' defined in class path resource [org/springframework/boot/autoconfigure/security/servlet/SpringBootWebSecurityConfiguration.class]: Unsatisfied dependency expressed through method 'defaultSecurityFilterChain' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.security.config.annotation.web.configuration.HttpSecurityConfiguration.httpSecurity' defined in class path resource [org/springframework/security/config/annotation/web/configuration/HttpSecurityConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.security.config.annotation.web.builders.HttpSecurity]: Factory method 'httpSecurity' threw exception; nested exception is java.lang.IllegalStateException: Cannot apply org.springframework.security.config.annotation.authentication.configuration.AuthenticationConfiguration$EnableGlobalAuthenticationAutowiredConfigurer@536a79bd to already built object

Im using Spring Boot v2.6.4

I'm stuck here for a while i would appreciate any help

Answer 1

Replace

    @Bean
    public AuthenticationManager authenticationManager(AuthenticationManagerBuilder auth ) throws Exception {
       return auth.userDetailsService(userDetailsService())
                  .passwordEncoder(passwordEncoder()).and().build();
    }

by

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