Git on Yer Happy Trails!
Happy Trails is a web application that was written in Play 2 (Java) and Grails 2 in order to do a side-by-side comparison of the two frameworks. The results of this comparison were initially presented at UberConf on June 21, 2012. If you'd like to read more about this session and its conclusions, see Play vs. Grails Smackdown at ÜberConf.
Happy Trails is released under version 2.0 of the Apache License.