The Script Bowl Featuring Groovy, JRuby, Jython and Scala. Raghavan Rags N. Srinivas CTO, Technology Evangelism

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1 The Script Bowl Featuring Groovy, JRuby, Jython and Scala Raghavan Rags N. Srinivas CTO, Technology Evangelism

2 The Script Bowl: Groovy Style Guillaume Laforge VP Technology at G2One, Inc. Groovy Project Manager

3 Guillaume Laforge Groovy Project Manager JSR-241 Spec Lead, standardizing the Groovy dynamic language in the JCP Initiator of the Grails web application framework Co-author of the Groovy in Action best-seller Manning VP Technology at G2One, Inc. Professional services around Groovy and Grails JavaOne SM Conference java.sun.com/javaone 3

4 Groovy is An Open Source dynamic language for the Virtual Machine for the Java platform (Java Virtual Machine or JVM machine) No impedence mismatch with Java programming environment Groovy uses a syntax much like Java programming language Shares the same object / threading / security model as Java programming language Uses the same APIs (regex, collections, strings ) Compiles down to normal Java programming language bytecode Provides native syntax constructs Lists, maps, regex, ranges Supports closures Simpler than any proposals for Java programming language! Groovy simplifies the use of many Java programming language APIs XML, Swing, JDBC API, unit testing & mocking, templating 2008 JavaOne SM Conference java.sun.com/javaone 4

5 The Script Bowl: JRuby Charles Nutter Technical Lead, JRuby

6 JRuby Co-Lead Charles Oliver Nutter Longtime developer of Java application environment (11+ yrs ) Engineer at Sun Microsystems for 1.5 yrs Full-time JRuby developer Also working on JVM implementation dynlang support Wide range of past experience > C, C++, C#, Python, Delphi, Lisp, Scheme > Java Platform, Enterprise Edition (Java EE platform) and Java Platform, Micro Edition (Java ME platform), Jini network technology, WS 6

7 JRuby Implementation of Ruby language in Java environment > Pure OO, Smalltalk-like, Perl/Python/Lisp-inspired > JRuby is just Ruby! Started in 2002, open source, many contributors > Tom Enebo, Ola Bini, Marcin Mielzinsky, Nick Sieger, Bill Dortch, Vladimir Sizikov, MenTaLguY Aiming for compatibility with current Ruby version > Ruby patchlevel 111 (114 was just released) Improvements on Ruby > Native threading, better performance, many libraries 7

8 JRuby 1.1 Major Features Full compiler for Ruby code to JVM interface bytecode Performance is many times better than C version New Regexp impl with encoding-agnostic features New rewritten IO subsystem to match Ruby/libc Reduced memory footprint Best compatibility level ever Ready for production use (and already being used) 8

9 The Script Bowl: Jython Frank Wierzbicki Technical Lead, Jython

10 Jython Jython brings the Python language to the JVM. Python is a very mature language which was designed to be easy to pick up but powerful to use. Jython has full and nearly seamless integration into any Java library and code. Jython can access many of the libraries and frameworks written in Python. Frank Wierzbicki has been a user of Jython since 1999, a committer since 2004, and the lead of Jython since He now works on Jython full time for Sun Microsystems JavaOne SM Conference java.sun.com/javaone 10

11 The Script Bowl: Scala Jorge Ortiz Community Member, Scala

12 Scala should not really be here It s not a scripting language in the usual sense. It s a full blown programming language, which is statically typed functional and object-oriented It also interoperates seamlessly with Java programming environment and has similar performance characteristics. Scala means scalable language Easy to build component abstractions Easy to embed domain-specific languages It looks a bit like a scripting language, because of type inference flexible syntax modern control abstractions 2008 JavaOne SM Conference java.sun.com/javaone 12

13 Why Scala? Modern, advanced type system, closures and pattern matching, traits and mixin composition Native XML support Abstractions for concurrency (actors, etc.) lift web framework Comparable LoC to Ruby on Rails app About half the LoC for testing Comet-style web apps with actors LAMP group at EPFL, Switzerland, led by Martin Odersky Current javac, Java environment generics, ACM Fellow Jorge Ortiz is a lift committer, blogs about Scala, and teaches Cross-paradigm programming with Scala at Stanford Scala lift off Saturday, May 10 ( JavaOne SM Conference java.sun.com/javaone 13

14 The Script Bowl: Judges Roberto Chinnici, Scriptologist Carol McDonald Ola Bini

15 The Script Bowl: Rounds Round 1: Text file processing Round 2: HTML Processing OR Text Generation OR JVM Machine Integration OR Web Framework Round 3: Open (free format round)