public static Long getLong(String key, Long defaultValue) {
        return NumberUtils.toLong(get().get(key), defaultValue);
    }
Gets value mapped to key, returning defaultValue if unmapped.

@param  key          to be found
@param  defaultValue returned if key is unmapped
@return              value associated with key
inlong-sort-standalone/sort-standalone-common/src/main/java/org/apache/inlong/sort/standalone/config/holder/CommonPropertiesHolder.java