This confusing Java...

Today evening I was playing around with Java and collections. After a while I finished with a funny code.

Rails architecture by Uncle Bob

I don't know Dear Reader how many Rails applications have you written in your life, but I have only one. However from the very beginning I had this feeling that something is wrong. Unfortunately I was not able to find a clear answer what is wrong and how I can make it better. Then I have found this presentation...