UserDetailsService (spring-security-docs-manual 5.5.1 API)

All Known Subinterfaces:

UserDetailsManager

All Known Implementing Classes:

CachingUserDetailsService, InMemoryUserDetailsManager, JdbcDaoImpl, JdbcUserDetailsManager, LdapUserDetailsManager, LdapUserDetailsService
```
public interface UserDetailsService
```
Core interface which loads user-specific data.
It is used throughout the framework as a user DAO and is the strategy used by the DaoAuthenticationProvider.
The interface requires only one read-only method, which simplifies support for new data-access strategies.

See Also:

DaoAuthenticationProvider, UserDetails

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  UserDetails loadUserByUsername(java.lang.String username)
  Locates the user based on the username.

- Method Detail
  - loadUserByUsername
```
UserDetails loadUserByUsername(java.lang.String username)
                        throws UsernameNotFoundException
```
    Locates the user based on the username. In the actual implementation, the search may possibly be case sensitive, or case insensitive depending on how the implementation instance is configured. In this case, the UserDetails object that comes back may have a username that is of a different case than what was actually requested..
    
    Parameters:
    
    username - the username identifying the user whose data is required.
    
    Returns:
    
    a fully populated user record (never null)
    
    Throws:
    
    UsernameNotFoundException - if the user could not be found or the user has no GrantedAuthority