- Do a file upload
- Return an arbitrary object from an RPC
In that case, dig around on the forums as this has been asked and answered before:
You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group.
To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/rfutqkv0vwYJ.
To post to this group, send email to firstname.lastname@example.org.
To unsubscribe from this group, send email to email@example.com.
For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.