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JRuby on Google App Engine is a compelling development and deployment option. We now have critical gems like redcloth and mechanize working, and spin-up time is less of an issue. You can use agile development techniques with Rails or Sinatra, then refactor specific URLs with Java or Duby servlets to do some heavy lifting. The JRuby development environment for Google App Engine runs inside a servlet container, which provides full access to the Java APIs. Deploying your app to production couldn't be easier. No need to provision hardware, new app instances spin up on demand, so you avoid paying for servers that sit idle.