@Override
    public UserContext getUserContext(AuthenticatedUser authenticatedUser)
            throws GuacamoleException {
        return null;
    }
{@inheritDoc}

<p>This implementation simply returns {@code null}, effectively allowing
authentication to continue but refusing to provide data for the given
user. Implementations that wish to veto the authentication results of
other {@link AuthenticationProvider} implementations or provide data for
authenticated users should override this function.
guacamole-ext/src/main/java/org/apache/guacamole/net/auth/AbstractAuthenticationProvider.java