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Sling is a new approach in web development. It is, amongst other, a thin REST layer onto a JCR repository. Sling also makes use of the language neutral scripting features of the java platform. Out of the box, several scripting languages are supported, like javascript and jruby. Since Groovy does have JSR 223 support, it is rather easy to create a groovy module to be used inside Sling. The only pity is that the Groovy Scripting Engine is not available via maven. See this Jira issue for some hints on creating a Groovy OSGI-module for Sling.