Deploying with JRuby 9k

Porting to JRuby

Before deploying any existing MRI-based Rails application on JRuby, you must make a few essential changes to its dependencies. To ensure that you keep track of your changes, initialize a Git repository and create a branch with the following commands:

$ cd ~/code/twitalytics
$ git init
$ git add -A
$ git commit -m "initial commit"
$ git checkout -b jruby
Switched to a new branch 'jruby'

In the past, preparing an app for JRuby required a number of library and code changes because many gems and commands such as Kerenel#exec couldn’t be used reliably. But today, JRuby 9k uses native operations for most I/O and process APIs. This makes it the only POSIX-friendly ...