rbramley/mahout-recommender — pull request #1 by limcheekin (2012-01-16 10:01:10+00:00)
Title: Please test it out

I found a solution at http://stackoverflow.com/questions/8115710/grails-2-0-invalid-sha1.

Also, the runtime block is not required.

If it is working fine on your side, I will release 0.5.2.