I'm using play framework 2.1.0, upload files to `play-app/upload` folder.

then I run `play 'start -Dhttp.port=80'` to start server.

but when I upload a file to `play-app/upload` folder, it can not be access immediately.

**if I stop the server and start again, then I can access the file.** 

How can I solve this problem? Thanks a lot.

ps, I route `/upload` as below:

```
GET     /upload/*file               controllers.Assets.at(path="/upload", file)

```

Could it be that static files are loaded once? How can I solve it?