If you like Spring + Backbone.js, you should have a look to RESThub

This small example application uses the following stack :

• XML free Spring MVC 3.1 backend (no web.xml, no applicationContext.xml)
• Spring Data based MongoDB persistence
• BackboneJS todo example application

In order to run it :

• Install Maven and MongoDB
• Create /data/db directory in order to allow MongoDB to store its data
• Run mongod daemon
• Run the following command : "mvn clean install t7:run" (Tomcat 7) or "mvn clean install jetty:run" (Jetty 8)
• Open your browser and go to http://localhost:8080/todo/