public BigInteger getBigInteger(String key, Filter filter, BigInteger defaultValue) { return (BigInteger) getPropertyWithFilter(key, filter, BigInteger.class, defaultValue);
public BigInteger getBigInteger(String key) { return properties.getBigInteger(key);
    public BigInteger getBigInteger(String key, Filter filter, BigInteger defaultValue) {        return (BigInteger) getPropertyWithFilter(key, filter, BigInteger.class, defaultValue);    }