how to do the authorisation

i have done the authentication using vaadin i have to do the authorisation.i am not able to find any help regarding this.what are the files(modules) to be created for the authorisation.please help me out.

Authorization is very application dependent, and not really specific for Vaadin.

That said, you might want to take a look at the
AppFoundation add-on
, which does provide some help for handling authentication and authorization in addition to view management, i18n etc.