Is there a tool or framework to Generate a CRUD UI in Swing?

Have a look at tools like:

MetaWidget http://www.metawidget.org/

Apache Isis

They generate UI's "on-the-fly" but allow you to customise the UI when necessary.

Much better than code generation.

NetBeans does seem like an obvious answer. These guys make a NetBeans plugin that does just that: http://www.morelisland.com/java_services/netbeans_tutorial/midbmetadata_se.htm

I've heard jgoodies does something similar: http://www.jgoodies.com/products/index.html

And more specifically their sub-project, Binding: https://binding.dev.java.net/

I know less about the SwingLabs databinding project, but it looks worth looking into: https://databinding.dev.java.net/