The instructions for updating the XML Commons website still use Forrest-0.5 http://xml.apache.org/commons/howto-forrest.html
I have it working locally using the new Forrest-0.7 version. Soon i will update the Forrest configuration files and the instructions. I will also stop the build system from calling forrest. Instead those who want to re-build the website can just run the 'forrest' command manually. -David