Feel free to issue a pull request to help our testing. We are not trying to push Java-based frameworks over any others and we believe we are being fair across the board. That being said, if there are "code mistakes... which go well beyond elementary incompetence", then we would love to correct and retest these.
Maybe you should've had the controllers execute raw SQL for a better comparison. I see you executing a regular query in Rails whereas your Java servlet is using prepared statements.
