Passing data between two vaadin projects


I have the following situation:

I have one Vaadin project in which users can authenticate. In this project, users can navigate to another Vaadin project.

Problem: In the second Vaadin project, I have to be able to know which user is authenticated in the first project. I already tried to make use of ServletContext objects and VaadinRequest objects, but I’m not able to make it work.

Thanks in advance,