@Override
    public Collection<User> findUsers(Set<String> fields, String query, int startIndex, int numResults) throws UnsupportedOperationException
    {
        throw new UnsupportedOperationException();
    }
A very basic implementation of a UserProvider, that retains data in-memory.

@author Guus der Kinderen, guus@goodbytes.nl
xmppserver/src/test/java/org/jivesoftware/openfire/user/TestUserProvider.java