This document summarizes a presentation on JRuby given by Koichiro Ohba. It discusses JRuby's current state, upcoming features, and demos. Key points include: - JRuby 1.1.5 was recently released with improved performance and compatibility. - JRuby 1.1.6RC1 is available and fixes many bugs while adding support for the Ruby 1.9 parser. - The GlassFish gem allows running Ruby on Rails and other web frameworks on the GlassFish application server. - A demo shows Redmine running on GlassFish using the GlassFish gem.

1. 2008-12-12;Matsue-OSS lab;Shimane-OSS
Meadowy.org
Akasaka.RB
JRuby Hot Topics
Koichiro Ohba

2. Agenda
•Introduction of JRuby
•JRuby now and future
•Demo

3. Running on JavaVM
Java Integration
Ruby 1.8.6 & 1.9
compatibility
native thread
What s JRuby

4. Tom E Enebo
Charles O Nutter
Core Developers

5. Charles visited maid
cafe with ko1 in June

6. Included
Manga
Power

7. JRuby now
•Release 1.1.5
•More speed, more bug fix,
more compatible.
•Rubygems 1.3.1
•Constant cache

8. RubyConf 06-Nov-08
•JRuby: What, Why,
How...Try It Now -
Tom&Charles
•JRuby HackFest

9. Many bugs
are found.
JRuby BugFest

10. 1.1.6 is available
•1.1.6RC1 has been
released
•many bug fixes
•Supports Ruby 1.9
parser

11. Foreign Function
Interface
e.g. C/C++ DLL
FFI

12. The Difference between
FFI and Ruby/DL
FFI Ruby/DL
No C header ○ ○
Callback ○ ○
Rubinius ○
DSL ○

13. Installable
RubyGems for
Enterprise
Application Server
GlassFish gem

14. v3 prelude
OSGi module
OSS
Rails,Merb,Sinatra,,
Small footprint(4MB)
GlassFish gem

15. jruby -S gem install glassfish
jruby -S gem install rack
jruby -S gem install activerecord-
jdbcmysql-adaptor
install
GlassFish gem

16. jruby -S glassfish_rails [RAILS_ROOT]
running
GlassFish gem

17. --runtimes
--runtimes_min
--runtimes_max
jruby runtime
control

18. Demo
•Redmine on
Glassfish gem
•Railgun