Hatim has written a very nice blogpost about Roo and Spring Security, including source and going into a good level of detail.

I don't know if you've noticed yet, but I'm a big fan of both Roo and the guys behind Roo. Big thanks to Alan & James from the forum post, ROO-1537 and ROO-1538, as of git version a474dc7b95613fae564f0e0fa50d89a6818bd753, and tested today one day later, my scripts run flawlessly through the tests! Which means, we can continue with Tiles. Stay tuned!

There's a great example of how to do spring security in Roo right here: http://bitbucket.org/jeduan/spring-roo-password/ Grab the code and read via

hg clone http://bitbucket.org/jeduan/spring-roo-password