UMLGaph for auto generating class diagrams from your source code

As part of improving the documentation of our software - a REST API - for the benefit of our customer (mainly an architect) and (future) users, we have investigated UMLGraph, a free application that is able to parse source code and (with the help of graphviz) generate class diagrams that can be embedded in the javadoc documentation.

The tool is very good and we're trying now to integrate it in our continuous integration build via ant.