exception while migrating vaadin 6 to vaadin 7

com.vaadin.server.ServiceException: No UIProvider has been added and there is no “UI” init parameter.

how can i resolve it …
plz help

Thanks & Regards
Hemanth Kumar


you must either implement your own UIProvider, or for a simpler way, just add a “UI” parameter to your web.xml. For intructions on how to do the latter, see chapter 4.8.3 in the


thank you very much …
its working …