code: public static void createFileBatchesLocal(File inputDirectory, boolean recursive, File outputDirectory, int batchSize) throws IOException {
          createFileBatchesLocal(inputDirectory, null, recursive, outputDirectory, batchSize);
      }
docs: See {@link #createFileBatchesLocal(File, String[], boolean, File, int)}.<br>
  The directory filtering (extensions arg) is null when calling this method.