Spring Security also provides default interfaces and implementations to support the management of users. You can create/delete/update users, and manage passwords using the UserDetailsManager interface. Details of the interface are as follows:

public interface UserDetailsManager extends UserDetailsService {
    void createUser(UserDetails user);
    void updateUser(UserDetails user);
    void deleteUser(String username);
    void changePassword(String oldPassword, String newPassword);
    boolean userExists(String username);
}

InMemoryUserDetailsManager and JdbcUserDetailsManager are a couple of default implementations of UserDetailsManager:

• InMemoryUserDetailsManager is typically used for testing purposes. It stores user details in-memory.
• JdbcUserDetailsManager provides a Java Database Connectivity (JDBC) implementation.