class ExchangeRatesClientFallback implements ExchangeRatesClient {

    @Override
    public ExchangeRatesContainer getRates(Currency base) {<FILL_FUNCTION_BODY>}
}

        ExchangeRatesContainer container = new ExchangeRatesContainer();
        container.setBase(Currency.getBase());
        container.setRates(Collections.emptyMap());
        return container;
    
<no_super_class>