jruby/activerecord-jdbc-adapter — pull request #513 by chapmajs (2013-12-09 02:52:09+00:00)
Title: Replacing use of ActiveRecord::ConnectionFailed with ActiveRecord::Conne...

ActiveRecord::ConnectionFailed was deprecated/removed sometime in 2007 as AR wasn't using the exception anywhere. ActiveRecord::ConnectionNotEstablished is current and has been in use since at least 1.2. We hit this when updating the AR JDBC adapter on a JRuby/Rails app running an ancient version of the connector.