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I am not familiar with IntelliJ, but you might find this thread useful with respect to setting up Jetty for debugging Vaadin applications.
There is no plugin for IntelliJ. so you will have to create the web.xml by hand and handle widgetset compilation etc. yourself. These are mostly one-time tasks for a project, though, and are described in the book. New client side widget creation and similar tasks require a little more effort without the Eclipse plugin.