Integration and Data Binding with Grails

I have read that some people are using Vaadin and Grails together, but I found almost nothing about how to actually glue them together. Are there any examples and best practices out there about how to do the data binding between Grails and Vaadin?

I am wondering how the data binding is concretely done and if there will be one Vaadin application or whether there can be many Vaadin applications and whether I would normally combine Grails GSPs and Vaadin applications or go for a Vaadin application only as view?

Any hints are very much appreciated.

Thilo