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Heroku Announces JRuby Support, Starting Now

This morning, Heroku announced immediate support for JRuby, allowing developers to utilize JVM-based libraries with Ruby syntax. Ruby developers already on Heroku can now use JRuby to run multiple threads of code in one process and take advantage of optimized Java libraries.

Heroku provides the following instructions for those starting from scratch with JRuby:

All you need to do is specify the version of Ruby you want to run, the engine, and the engine version in your Gemfile:

ruby '1.9.3', engine: 'jruby', engine_version: '1.7.1'

You'll need to run bundle install with JRuby locally, then commit the results and push to Heroku:

$ git add .
$ git commit -m "trying JRuby on Heroku"
$ git push heroku master
Counting objects: 692, done.
Delta compression using up to 4 threads. Compressing objects: 100% (662/662), done.
Writing objects: 100% (692/692), 141.01 KiB, done. Total 692 (delta 379), reused 0 (delta 0)
-----> Heroku receiving push
-----> Ruby/Rails app detected
-----> Using Ruby version: ruby-1.9.3-jruby-1.7.1
-----> Installing JVM: openjdk7-latest
-----> Installing dependencies using Bundler version 1.2.1 # ...

Heroku also provides instructions for moving existing rails apps to JRuby.

JRuby support is live now, so you can get git-pushing immediately if you like. And if you do, let us know what you think of the experience.

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