Part of the answer is Java itself. It's verbose, static typed, and requires a lot of boilerplate code to do properly. The fact that classes are a compile-time concern, rather than a runtime concern, is just such a drag. You end up with interfaces you don't really need, only so that you can inject them into constructors so that your app is properly decoupled and testable. Part of it is a framework issue. Struts is hor…
Also very very much fashion lead by hipsters who must be using the newest coolest untested thing on the planet.