servlet - session integration

Hi to all.

I am opening a fillable pdf form in a vaadin embedded component and after the user fills the form the whole pdf is posted to a servlet via a submit button action on the pdf. (pdf forms capability of Adobe Acrobat)
Does anyone have an idea about how can I relate the data handled by the servlet with the vaadin application session which shows the pdf in an embedded component in the first place I mean how can I continue the application flow after the form submission and servlet operation for that specific session.

Thanks in advance.

Gökhan

If you are generating the fillable PDF on the fly with user-specific details, just include a read-only field with the unique identifier you need.