CommonsMultipartResolver is MultipartResolver implementation for Jakarta Commons DiskFileUpload. DiskFileUpload has 2 fields: 1) sizeMax - maximum allowed size of a complete request. 2) fileSizeMax - maximum allowed size of a single uploaded file.
CommonsMultipartResolver implements maxUploadSize field as:
public void setMaxUploadSize(long maxUploadSize) {
this.fileUpload.setSizeMax(maxUploadSize);
}
which explains the reason for your exception.