The jRuby presentation by Charles Nutter at Ruby Midwest 2010. Charles blogs at blog.headius.com and tweets as @headius.

1. JRuby
All Sorts of Cool Stuff

2. Me
• Charles Oliver Nutter
• JRuby Architect at Engine Yard
• Java developer since 1997
• JRuby developer since 2005
• @headius, headius@headius.com

3. JRuby
• Ruby on JVM
• Latest release: 1.5.1
• Ruby 1.8.7 compat, 1.9.2 coming
• It’s Just Ruby!
• (It’s Not Just Ruby!)

4. Boring Stuff
• Trivial install: unpack, run (only prereq: Java)
• Performance is great, ~1.9
• Rails etc run great
• Production users since 2007
• Most mature, most stable alternative Ruby

5. Cool Stuff
• Native threads (real concurrency!)
• Java/JVM integration
• Tooling and maturity
• New frontiers

6. Native Threads
• Ruby Thread :: Native Thread
• Thread.new # real system-level thread
• One process can saturate all cores
• One Rails instance for a whole site

7. Scaling Rails

8. Platform Integration
• Use any Java library like it’s a Ruby library
• No-compile, single-file deployments
• Cross-platform GUI libraries

9. Using a Library

10. Tooling and Maturity
• Editor/IDE support with bonuses
• Debugging tools
• Profiling, memory tools
• Commercial JVM environments

11. Tools

12. New Frontiers
• Google AppEngine
• Java or Python only (...or JRuby!)
• Android
• Java-mostly (...or JRuby!)
• Anywhere with a Java server
• Deploy like any other application

13. Android

14. Your Turn
• Just try it!
• Tell everyone
• Let us know what you need

15. JRuby Book!

16. For The Managers
• Three fulltime devs at Engine Yard
• Support, professional services
• And OSS-style IRC/email support
• Engine Yard Cloud (soon!)
• Well-established, mature, stable

17. Thanks!
• http://jruby.org
• http://wiki.jruby.org
• http://bugs.jruby.org
• http://engineyard.com/jruby
• http://blog.headius.com