@Override
    public void setModificationDate(String username, Date modificationDate) throws UserNotFoundException {
        throw new UnsupportedOperationException();
    }
LDAP implementation of the UserProvider interface. All data in the directory is
treated as read-only so any set operations will result in an exception.

@author Matt Tucker
xmppserver/src/main/java/org/jivesoftware/openfire/ldap/LdapUserProvider.java