Solution 13 is not functionally compatible as its changed behaviour of equals method on one of its API types

Solution12 is binary backward incompatible as it removed method with two Currency parameters and replaced it with ... one. This is source compatible, but binary incompatible.

Solution 04 is not source compatible as it added new methods into a subclassable interface

Solution 02 is not backward compatible as it changed return type of one method in ConvertorFactory class

We need to remove XML files describing the result of test run in case of successful build (e.g. there was a test failure) as that prevents Hudson from claiming the build is unstable.

Solution 02 is not backward compatible as it changed return type of one method in ConvertorFactory class

I need to remove solution 12 as it did not allow to query a history with one convertor. There was no way to provide arbitrary date, one could query only about the present state. As such the API was quite simplified and it would be unfair for others if this solution advanced to the final round. Sorry.

removing 'ignore.failing' messages

Owner of solution 2 did not sent the solution for task 4, as far as I can tell

solution 4, task4