Now you can bring the best of Ruby
into the world of Java, with Using JRuby. Come to the source for the JRuby core team's insights and insider tips. You'll learn how to call Java
objects seamlessly from Ruby, and deal with Java
idioms such as interfaces and overloaded functions. Run Ruby
code from Java, and make a Java
program scriptable in Ruby. See how to compile Ruby
into .class files that are callable from Java, Scala, Clojure, or any other JVM language.