code: public static CreateRequest checkRequest(final HttpServletRequest request,
  			final DiskFileItemFactory factory,
  			final CreateResponse createResponse) throws FileUploadException {
  		final FormItemList formItemList = FormItemList.extractFormItems(
  				request, factory);
  		return checkRequest(formItemList, createResponse);
  	}
docs: check a create request for validity concerning NSSP
  
  @param request
  Tomcat servlet request
  @param factory
  disk file item factory
  @param createResponse
  create response object
  @return create request object<br>
  <b>null</b> if the create request is invalid
  @throws FileUploadException
  if errors encountered while processing the request