code: public MultipartConfigElement createMultipartConfig() {
  		long maxFileSizeBytes = convertToBytes(this.maxFileSize, -1);
  		long maxRequestSizeBytes = convertToBytes(this.maxRequestSize, -1);
  		long fileSizeThresholdBytes = convertToBytes(this.fileSizeThreshold, 0);
  		return new MultipartConfigElement(this.location, maxFileSizeBytes,
  				maxRequestSizeBytes, (int) fileSizeThresholdBytes);
  	}
docs: Create a new {@link MultipartConfigElement} instance.
  @return the multipart config element