if (data != null) {
            try {
                return SerializeUtil.fromBinaryToObject(data);
            } catch (final Exception e) {
                throw new CrawlerSystemException("Could not create an instanced from bytes.", e);
            }
        }
        return new HashMap<String, Object>();
    }

    public void addMetaContentMapping(final String metaname, final String dynamicField) {