JRuby is an open source programming language created in 2001.
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JRuby is an implementation of the Ruby programming language atop the Java Virtual Machine, written largely in Java. It is free software released under a three-way EPL/GPL/LGPL license. JRuby is tightly integrated with Java to allow the embedding of the interpreter into any Java application with full two-way access between the Java and the Ruby code (similar to Jython for the Python language). Read more on Wikipedia...
//Example using JSR 233 Scripting for Java 6
ScriptEngineManager mgr = new ScriptEngineManager();
ScriptEngine rbEngine = mgr.getEngineByExtension("rb");
try {
rbEngine.eval("puts 'Hello World!'");
} catch (ScriptException ex) {
ex.printStackTrace();
}