I'm trying to persist blobs using GAE and assign them to the user who
has uploaded the blob.
I've took the following sample code as a starting point:

http://code.google.com/intl/en-US/appengine/docs/java/blobstore/overview.html

Uploading blobs works fine as you can see here: lox.loxal.org >
"Create Task"

To assign a blob to a certain user I need the blob's BlobKey... So I
try to use this (Scala code)...

  val req: HttpServletRequest = this.getThreadLocalRequest
  val blobs: java.util.Map[java.lang.String, BlobKey] =
blobstoreService.getUploadedBlobs(req)
  val blobKey: BlobKey = blobs.get("myFile")

...in the server-side code to return the BlobKey. But

  val blobs: java.util.Map[java.lang.String, BlobKey] =
blobstoreService.getUploadedBlobs(req)

throws this exception:

  Caused by: java.lang.IllegalStateException: Must be called from a
blob upload callback request.

How can I use HttpServletRequest data in server-side code without
getting this exception?

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