* @return The value of found property. (NotNull: if not found, exception but basically no way)
     * @throws NumberFormatException When the property is not integer.
     */
    Integer getCrawlerDocumentCacheMaxSizeAsInteger();

    /**
     * Get the value for the key 'crawler.document.cache.supported.mimetypes'. <br>
     * The value is, e.g. text/html <br>
     * comment: Supported MIME types for document cache.