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## org.acegisecurity.userdetails
Interface UserDetailsService

All Known Implementing Classes:
  InMemoryDaoImpl, JdbcDaoImpl

    public interface UserDetailsService

Defines an interface for implementations that wish to provide data access services to the `DaoAuthenticationProvider`.

The interface requires only one read-only method, which simplifies support of new data access strategies.

Version:
  $Id: UserDetailsService.java,v 1.9 2005/11/29 13:10:10 benalex Exp $
Author:
  Ben Alex

Method Summary
`UserDetails` | `loadUserByUsername(String username)` Locates the user based on the username.

Method Detail

### loadUserByUsername

    UserDetails loadUserByUsername(String username)
                                   throws UsernameNotFoundException,
                                          DataAccessException

  Locates the user based on the username. In the actual implementation, the search may possibly be case insensitive, or case insensitive depending on how the implementaion 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 presented to the `DaoAuthenticationProvider`
  Returns:
    a fully populated user record (never `null`)
  Throws:
    `UsernameNotFoundException` - if the user could not be found or the user has no GrantedAuthority
    `DataAccessException` - if user could not be found for a repository-specific reason

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