GAE java.lang.IllegalStateException: Must call one of set*BlobStorage() first

Question

I am trying to upload a file in GAE using the Blobstore API. I am getting the following exception when running the GAE server locally (dev mode):

WARNING: /_         


        

Answer 1

When call your page that generates html (using servlet, jsp, etc.) and calls blobstoreService.createUploadUrl("/upload"); you can't re-use this page multiple times.

Reload this page in a browser every time you want to upload the file.