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.

JBoss Seam has a scripting utility called seam-gen that will create scaffolding:

http://docs.jboss.org/seam/1.1BETA2/reference/en/html/gettingstarted.html

AppFuse.

It is very powerful, perhaps it will be too powerful for the task in question, but it does it well.

Netbeans has something like this.

There's a demo here: http://www.netbeans.org/kb/55/persistence-demo.html

There's krank on Google Code. I haven't tried it yet, but it looks promising.

Check out Tynamo

Try Grails at http://www.grails.org/

I've got this a long time ago.

http://mahosoft.com/docs/WhitePaper-WEB-App-Spanish.pdf

Google translation to english:

http://translate.google.com/translate?hl=en&u=http://mahosoft.com/docs/WhitePaper-WEB-App-Spanish.pdf&sl=es&tl=en

May be outdated though.

reinCRUD is a vaadin add-on which works using annotated hibernate entities. You can create a CRUD application within a few minutes and you can re-use components like lists, forms and search forms.