title: Vaadin 7 Session Id
body: <p>Does Vaadin 7 offer some kind of session identifier? I want to track some usage by each session.</p>
  
  <p>I looked at the doc for <a href="https://vaadin.com/api/com/vaadin/server/VaadinSession.html" rel="noreferrer"><code>VaadinSession</code></a> but did not notice any.</p>
  
  <p>I suppose I could roll my own by generating a UUID and attaching it to the VaadinSession with a call to <code>setAttribute</code>. But no need if Vaadin gives me an identifier.</p>