Autowired CrudRepository into UserDetailsService is always null - spring

Question

I'm newbie in Spring-World, I have a Spring Boot application with Spring Security and JPA. Also have CrudRepository and UserDetailsService, see below
Application class
#Configuration
#ComponentScan
#EnableAutoConfiguration
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
UserDao
#Repository
public interface UserDao extends CrudRepository<User, Long> {
public Collection<User> findByName(String name);
}
ApiUserDetailsService
#Component
public class ApiUserDetailsService implements UserDetailsService {
#Autowired
private UserDao dao;
#Override
public UserDetails loadUserByUsername(final String username) throws UsernameNotFoundException {
assert dao != null;
...
}
}
Security Config
#Configuration
#EnableWebSecurity
public class HttpBasicAuthConfig extends WebSecurityConfigurerAdapter {
#Override
protected void configure(HttpSecurity http) throws Exception {
http.csrf().disable();
http.requestCache().requestCache(new NullRequestCache());
http.httpBasic();
http.authorizeRequests().anyRequest().authenticated();
}
#Autowired
public void registerAuthentication(AuthenticationManagerBuilder auth) throws Exception {
auth.userDetailsService(new ApiUserDetailsService());
}
}
Why Autowired dao is always null? What I do wrong?

Answer 1

You are creating the ApiUserDetailsService manually, in the the method:
#Autowired
public void registerAuthentication(AuthenticationManagerBuilder auth) throws Exception {
auth.userDetailsService(new ApiUserDetailsService());
}
What you want is:
#Configuration
#EnableWebSecurity
#EnableJpaRepositories(basePackages = {"your.package.dao"})
public class HttpBasicAuthConfig extends WebSecurityConfigurerAdapter {
#Override
protected void configure(HttpSecurity http) throws Exception {
http.csrf().disable();
http.requestCache().requestCache(new NullRequestCache());
http.httpBasic();
http.authorizeRequests().anyRequest().authenticated();
}
// register ApiUserDetailsService as a bean
#Bean
public UserDetailsService apiUserDetailsService() {
return new ApiUserDetailsService();
}
#Autowired
public void registerAuthentication(AuthenticationManagerBuilder auth) throws Exception {
// get the autowired bean from Spring
auth.userDetailsService(apiUserDetailsService());
}
}