any difference between @Autowired AuthenticationManager and @Override configure(AuthenticationManagerBuilder auth) · Issue #4571 · spring -projects/spring-security · GitHub
Upgrading to Springboot 2.0 @Autowired AuthenticationManager fails no such bean · Issue #12836 · spring-projects/spring-boot · GitHub
AuthenticationManager bean not found · Issue #2 · in28minutes/full-stack-with-angular-and-spring-boot · GitHub
![java - How the Spring Security AuthenticationManager authenticate() method is able to check if the username and password sent are correct? - Stack Overflow java - How the Spring Security AuthenticationManager authenticate() method is able to check if the username and password sent are correct? - Stack Overflow](https://i.stack.imgur.com/tn5yc.png)