UserDetailsService
UserDetailsService is a Spring Security interface for retrieving user-specific data required during authentication.
Spring Security in Action, Second Edition
UserDetailsService is a Spring Security interface for retrieving user-specific data needed to authenticate a user.
- How it is used
- Retrieves user details for AuthenticationProvider during Spring Security authentication.
- How deep it goes
- Defines the single retrieval method, custom implementations, provided implementations, registration, and testing, while deferring password encoding details.
- Examples
- Uses in-memory users, a custom list-backed service, curl requests, and @WithUserDetails integration tests.
- What you can do after
- Builds or configures a user-details provider and tests authentication against an endpoint.
Read how Spring Security in Action, Second Edition explains UserDetailsService →
Spring in Action, Sixth Edition
UserDetailsService is a Spring Security interface that retrieves user-specific authentication details synchronously.
- How it is used
- Configures authentication by supplying Spring Security with user-specific details through a UserDetailsService bean.
- How deep it goes
- Defines the one-method contract and demonstrates in-memory and repository-backed implementations with missing-user handling.
- Examples
- Uses in-memory users named buzz and woody, then demonstrates a Taco Cloud database lookup through UserRepository.
- What you can do after
- Build it from scratch by declaring an in-memory or repository-backed UserDetailsService bean.
Read how Spring in Action, Sixth Edition explains UserDetailsService →
Related concepts
- ReactiveUserDetailsServiceequivalent to · ReactiveUserDetailsService is a Spring Security interface for asynchronously retrieving user details used in authentication.
- AuthenticationProviderused by · AuthenticationProvider is a Spring Security interface or component that encapsulates a specific authentication mechanism and returns an authentication result.
- InMemoryUserDetailsManagerimplemented by · InMemoryUserDetailsManager is a Spring Security UserDetailsService and UserDetailsManager implementation that stores user details in application memory.
- UserDetailsManagerincludes · UserDetailsManager is a Spring Security interface that extends UserDetailsService with operations for creating users and modifying or deleting user passwords.
- functional interfacekind of · A functional interface is an interface with exactly one abstract operation, making it compatible with implementation by a function, lambda expression, or method reference.
- loadUserByUsernamehas part · loadUserByUsername is the UserDetailsService operation that retrieves the security information associated with a specified username.
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