Can vaadin work without using cookies?
I don’t know if you can change some settings, but in general: no. With disabled cookies, you get a “Session expired” error after each interaction.
This is not the first requests for supporting cookieless sessions in Vaadin. We have not decided yet on whether and how to support this. Could you elaborate a bit about why you need cookieless sessions and how they should be supported.
Also create a ticket for this request (in backlog):
http://dev.vaadin.com/ticket/3228
If there is enough demand for this, it will be resolved.