What’s Not in This Book?
This book won’t teach you how to write code in the Ruby language. You’ll write a bit of Ruby code in the course of this book, but you won’t learn about specific features of the Ruby language. In particular, this book doesn’t cover continuations, ObjectSpace, fibers, and other topics that have subtle differences when applied to JRuby. This book is specifically about deploying JRuby applications and how JRuby affects your production environments.
Other topics not addressed include zero-downtime deployments, database migrations, the asset pipeline, and content delivery networks (CDN). These are important aspects of Ruby web application development, but they’re not notably different between MRI and JRuby. You can learn ...
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