* Searches the class hierarchy to find the field.
     */
    private Object getField(Object obj, String fieldName) throws Exception {
        Class<?> clazz = obj.getClass();
        while (clazz != null) {
            try {
                java.lang.reflect.Field field = clazz.getDeclaredField(fieldName);
                field.setAccessible(true);
                return field.get(obj);

        while (jsonParser.nextToken() != JsonToken.END_OBJECT) {
            final String fieldName = jsonParser.getCurrentName();
            if (fieldName != null) {
                jsonParser.nextToken(); // Move to the value of the current field

                if (jsonParser.getCurrentToken() == JsonToken.START_ARRAY) {
                    nestedMap.put(fieldName, parseArray(jsonParser));

            propMap.put(CRAWLER_METADATA_NAME_MAPPING, params);
        }
        return params.get(name);
    }

    default void addCrawlerMetadataNameMapping(final String name, final String fieldName, final String mappingType,
            final String dateFormat) {
        if (getCrawlerMetadataNameMapping(name) != null) {
            return;
        }

        @SuppressWarnings("unchecked")