Fix: LoadError: no such file to load — mysql2/mysql2 with jRuby and Warbler

August 7, 2013 12:03 pm /

I recently transitioned a Ruby on Rails Passenger server to jRuby with Tomcat and encountered an error caused by the Gemfile.

“no such file to load — mysql2/mysql2
LoadError: no such file to load — mysql2/mysql2”

The fix? JRuby needs a MySQL adapter named “activerecord-jdbcmysql-adapter” in order to it to work properly.

# Original MySQL Adapter --
# gem 'mysql2', '~>0.3.13'
#
# New Adapter for jRuby
gem 'activerecord-jdbcmysql-adapter'

Adding the ‘activerecord-jdbcmysql-adapter’ gem and commenting out the original “mysql2” gem fixed the issue. I recommend using the “warble executable war” to troubleshoot these errors since you can quickly run a “java -jar myapp.war” to test it out.

Tested with jRuby 1.7.4, Rails 3.2.12

Posted in: Ruby on Rails / Tagged: , ,

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