Is there a CRUD generator utility in Java(any framework) like Scaffolding in Rails?

Spring Roo seems to be exactly what you're looking for: CRUD code generation, spits out pure Java code that can be made tun run entirely independant from the framework.

Grails has scaffolding.

See the Telosys Tools Eclipse plugin at http://www.telosys.org/

The plugin connects to the database, generates a lightweight repository, lets you customize the repository if necessary and generates Java Beans, DAO, XML converters, ScreenMaps (JSP) etc...

You can build a Data Centric Web App in few minutes