Error "No AuthenticationProvider found for org.springframework.security.authentication.UsernamePasswordAuthenticationToken" in authorization-server module

[pop1213]

The reason for this error should be the dependency on Spring Boot 3.4.0-M3. In this version, the annotation @ConditionalOnBean(ObjectPostProcessor.class) of UserDetailsServiceAutoConfiguration references the deprecated ObjectPostProcessor type, which causes UserDetailsServiceAutoConfiguration to be skipped when scanning the configuration classes.

[martsbradley]

Thanks for creating this bug report.

To get past this issue I had to create the below bean.

@Configuration
public class MyConfig {
    @Bean
    public UserDetailsService userDetailsService() {
        UserDetails user = User.withUsername("user")
                .password("{noop}password")
                .roles("USER")
                .build();
        return new InMemoryUserDetailsManager(user);
    }
}

The Readme.adoc in the samples and this getting-started.html was describing how it should just work, but seems due to this issue it would not work.