@Override
    public Credentials updateCredentials(Credentials credentials)
            throws GuacamoleException {
        return credentials;
    }
{@inheritDoc}

<p>This implementation simply returns the provided {@code credentials}
without performing any updates. Implementations that wish to perform
credential updates for in-progress authentication requests should
override this function.
guacamole-ext/src/main/java/org/apache/guacamole/net/auth/AbstractAuthenticationProvider.java