Using JRuby helps experienced Java hands and Rubyists see what's on the other side of the fence--and bring the best of Ruby to the broad universe of Java environments. With JRuby, you can: * Run your interpreted or compiled Ruby program in environments where the Java Virtual Machine is a requirement. * Treat JRuby as a "better Ruby," with faster performance for some uses and hassle-free linkage to third-party code. * Make your Java program scriptable with Ruby. * Build an app on solid libraries written in Java, Scala, Clojure, or other JVM languages. You'll learn how to call Java code from Ruby, and vice versa. You'll gain first-hand experience with dozens of JRuby's most common uses, from running web sites to building GUIs. And you'll see how it's all put together under the hood. JRuby lets you merge the best of several possible worlds, so you can create unique software using the best tools available.

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Charles O Nutter is the principal developer of JRuby. He has worked at Ventera, Sun, and now, EngineYard. During his time on the project, he has steered JRuby to its place as the fastest Ruby implementation. Thomas Enebo has striven since 2003 to make JRuby a piece of software that will capture the hearts and minds of Ruby and Java developers everywhere. He works at EngineYard alongside Charles and Nick. Nick Sieger is a prolific blogger and programmer who contributes not only to the JRuby core, but also to numerous libraries that Ruby programmers depend on every day in their work with JRuby. He works at EngineYard. Ola Bini writes software at Thoughtworks Studios, and is the author of Practical JRuby on Rails. He is constantly pushing the boundaries between programming languages. Ian Dees is the author of Scripted GUI Testing With Ruby. By day, he slings C++, Ruby, LabVIEW, and other languages for a test equipment manufacturer in Portland, Oregon.

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