Hands-On Spring Security 5 for Reactive Applications

Setting up AuthenticationManager

There are number of built-in AuthenticationManager in Spring Security that can be easily used in your application. Spring Security also has a number of helper classes, using which you can set up AuthenticationManager. One helper class is AuthenticationManagerBuilder. Using this class, its quite easy to set up UserDetailsService against a database, in memory, in LDAP, and so on. If the need arises, you could also have your own custom UserDetailsService (maybe a custom single sign-on solution is already there in your organization).

You can make an AuthenticationManager global, so it will be accessible by your entire application. It will be available for method security and other WebSecurityConfigurerAdapter ...