JFace Data Binding/FAQ
Does Data Binding depend upon Eclipse?
The core Data Binding plug-in only depends upon org.eclipse.equinox.common and no other parts of Eclipse. There are parts of Data Binding that depend upon SWT/JFace but these have been broken out into a separate plug-in, org.eclipse.jface.databinding.ui. For a discussion of why the core depends upon equinox common see bug 153630 comment 9.
Does Data Binding depend upon SWT?
No. Data Binding is meant to be UI toolkit agnostic and more specifically UI agnostic. There is default support for SWT and JFace but this is in the org.eclipse.jface.databinding.ui project which is separate from the core Data Binding APIs that live in org.eclipse.jface.databinding.
How do I bind to the ValidationError of a Binding or DataBindingContext?
See snippet 004.