title: Sessions handling in Vaadin
body: <p>I have a <code>Vaadin</code> application that starts with a <code>user login</code>, but the problem is with <code>Vaadin</code> is the session handling as I can open two sessions from 2 different browsers with the same <code>login</code> which should not be possible to do. But I did not find any documentation regarding that besides this <a href="https://stackoverflow.com/questions/18594631/vaadin-close-ui-of-same-user-in-another-browser-tab-system">topic</a> but it's not working properly as the data are not saved in the <code>hashmap</code> correctly.Anyone got the same problem?</p>