This Grails plugin uses yUML (http://www.yuml.me/) to draw class diagrams for your Grails Domain classes.

This project is now hosted at: http://grails.org/plugin/create-domain-uml

To get the plugin:

grails install-plugin create-domain-uml

To run the plugin:

grails create-domain-uml

This will create a file DomainUML.html in your project root which contains the diagrams.

Example (Using the domain from Grails In Action):

Neat



Neat - right to left



Scruffy - right to left