Vaadin being a web framework, its output can be displayed inside a browser.
Whatever way you choose to run our previously created Vaadin project, in order to use it, we just have to open one's favorite browser and navigate to
http://localhost:8080/myfirstvaadinapp/vaadin. Two things should happen:
Vaadin is running in DEBUG MODE.
Add productionMode=true to web.xml to disable debug features.
To show debug window, add ?debug to your application URL.