I would suggest that you look at Spring JS, which relies heavily on Dojo. A tutorial can be found here.
Easiest way for yourself to start playing with it is to download Spring Roo, create the petclinic sample application with one of the example-scripts (this takes you 5 minutes) and then play around with how the javascript is integrated. Spring Roo creates an app with the same technology stack that you use (Spring+hibernate+implementation of jsr 303)