Plugins You can find out about all the publicly available Grails plugins.

Mahout Recommender Plugin - A Scalable Recommendation System

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The Mahout Recommender plugin enabled you to use Apache Mahout recommendation algorithms in your Grails project. With the plugin, you can find an effective recommender, evaluating precision and recall, and evaluating the performance of the selected recommender without writing single line of code.

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Dependency :
compile ":mahout-recommender:0.5.2"

Documentation