John Woodell, a JRuby developer from Google, describes the state of JRuby on Google’s AppEngine.

App Engine version 1.4.0. is here! It’s our most significant release of the year for the App Engine SDK, including a number of very big features that we know developers have been eagerly awaiting. App Engine’s infrastructure can now anticipate the need for more resources and warm up new application instances (in the background) before routing user traffic to them.

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