code: void setBatchSize(String batch_Size) {
          if (!StringUtils.isBlank(batch_Size)) {
              batchSize = Integer.valueOf(batch_Size);
              if (batchSize == 0) {
                  throw new IllegalArgumentException("kundera.batch.size property must be numeric and > 0.");
              }
          }
      }
docs: Sets the batch size.
  
  @param batch_Size
  the new batch size