The No-Java-Code Promise
You won’t have to write any Java code as you work your way through this book. That’s not what this book is about. It’s about deploying Ruby applications on the JVM. The technologies and tools you’ll learn about in this book hide the XML and Java code from you. As the JRuby core developers like to say, “[They] write Java so you don’t have to.”[4]
You may want to include some Java code in your application. Or you may want to make calls to some Java libraries. That’s entirely your choice. If you want to write your programs exclusively in Ruby and deploy them on the Java Virtual Machine—as so many of us do—then go ahead.
There are many reasons to deploy Ruby applications on the JVM, and using Java libraries and APIs ...
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