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) {
        if (metaContentMapping == null) {
            metaContentMapping = new HashMap<>();
        }
        metaContentMapping.put(metaname, dynamicField);