Used by
InMemoryDaoImpl to store a list of users and their corresponding granted authorities.
author: Ben Alex version: $Id: UserMap.java 1677 2006-09-15 03:47:17Z benalex $
Locates the specified user by performing a case insensitive search by username.
Parameters: username - to find the located user throws: UsernameNotFoundException - if the user could not be found
Set the users in this
UserMap . Overrides previously added users.
Parameters: users - Map <String, UserDetails> with pairs (username, userdetails) since: 1.1