intermediate~2h
Managing Users: UserDetailsService & UserDetailsManager
Every authentication flow eventually needs to answer one question: who is this user, really? This chapter is UserDetailsService and UserDetailsManager — the mechanism Spring Security uses to look that up.
Learning objectives
- Beginner: Explain what UserDetailsService's loadUserByUsername() is responsible for, and what it is NOT responsible for.
- Intermediate: Choose between InMemoryUserDetailsManager, JdbcUserDetailsManager, and a custom UserDetailsService for a given project's stage.
- Advanced: Implement a production-shaped custom UserDetailsService backed by your own user table and entity.
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Managing Users: UserDetailsService & UserDetailsManager