% JRuby: When Ruby grows up...
% Open Source Bridge 2009
% Lennon Day-Reynolds

# Me

- Now: Project Kenai (http://kenai.com/)
- History: J2EE since 1999, Ruby since 2002

# JRuby

- Open source, Ruby 1.8 compatible (and most of 1.9)
- Currently at version 1.3.1
- Stable, production-ready, full Rails support

# Try it out

- Download from jruby.codehaus.org
- Or grab snapshot w/examples:<br/>
  http://rcoder.net/files/osbridge_2009.zip

# Getting started

Launch JIRb

~~~
$ ./jruby/bin/jruby -S jirb
~~~

# Basic Java integration

Using Java library classes

~~~~ {.ruby}
require 'java'
java_hash = Java::JavaUtilCollection::HashMap.new
java_hash.put 'foo', 1
puts java_hash['foo']
# => 1
~~~~

# Gotchas

- C extensions (unless ported to FFI)
- Fork

# Demo 1: Wrapping a Java library

Apache Sanselan:<br/> http://incubator.apache.org/sanselan/

RSpec:<br/> http://rspec.info/

# Demo 2: Building a web interface

Sinatra:<br/> http://www.sinatrarb.com/

Warbler:<br/> http://caldersphere.rubyforge.org/warbler/

# Demo 3: Multi-language apps

JSR223:<br/> https://scripting.dev.java.net/

# Demo 4: Messaging

ActiveMQ:<br/> http://activemq.apache.org/

# Questions?