Are you sure about this?
In the 2.2 branch we have:
/**
* The component used to parse attachment references.
*/
@Requirement("current")
private AttachmentReferenceResolver attachmentReferenceResolver;
My mistake. I
removed the annotation in revision 26759. I wanted to
remove only the hint (there's no current document for GWT-RPC requests)
and it seems I removed the entire annotation..
Asiri, thanks for catching this!