docs: private static void initStaticActionMap(Set<String> scanPackages) {
          Set<Class<?>> set;
          if (CollectionUtils.isEmpty(scanPackages)) {
              set = collectConverterClass(StringUtils.EMPTY);
          } else {
              Function<String, Stream<Class<?>>> function = scanPackage -> collectConverterClass(scanPackage).stream();
              set = scanPackages.parallelStream().flatMap(function).collect(Collectors.toSet());
          }
          if (CollectionUtils.isEmpty(set)) {
              log.warn("There is no any static conversion object");
              return;
          }
          set.parallelStream().forEach(clz -> packagingAction(clz.getDeclaredMethods(), null));
      }