Dependency injection can make your life easier by reducing boilerplate code and help create testable components [1][2]. Integration with Guice-servlet [3] provides automated scoping of object lifetimes at the Request and session level. An additional vaadin-specific scope, UIScope is provided in the module. [1] https://code.google.com/p/google-guice/wiki/Motivation [2] http://en.wikipedia.org/wiki/Dependency_injection [3] https://code.google.com/p/google-guice/wiki/Servlets Adapted from: https://github.com/davidsowerby/v7/.