Sonar

It needs to upgrade from activerecord-jdbc-adapter 0.9 to 0.9.1. It fixes many derby issues, but two blocking issues still must be resolved :

• JRUBY-3548 : add "require 'active_record/version'" to conf/environment.rb
• JRUBY-3555 : remove derby_schema parameter from methods tables() and columns() in jdbc_adapter/jdbc_derby.rb

Reverting the upgrade. Version 0.9.1 has too many regression issues, particularly JRUBY-3616 that avoids Rails starting.