static <T> T loadfrom(URL url, Class<T> clazz) throws JsonParseException, JsonMappingException, IOException {
        if (url == null)
            throw new IllegalArgumentException();
        T target = MAPPER.readValue(url, clazz);
        return target;
    }
@return the default retry mode, or null if not configured
aws-java-sdk-core/src/main/java/com/amazonaws/internal/config/InternalConfig.java