更新时间:2022-10-15 08:17:56
Commons FileUpload (1.2.1) is only semi-compatible with GAE. Only streaming API is supported but not the traditional API beacuse a local filesystem is not made available by GAE. In the stacktace, I see usage of DiskFileItem, which basically writes the uploaded file locally and deletes it later.
See the section under Apache Commons FileUpload at GAE and support for Java frameworks
Here's the streaming API usage.