You'll need to implement an interface so that Spring has something it can use as a Proxy interface.
Spring will implement the transactional logic using JDK dynamic proxies, these rely on proxied classes implementing suitable interfaces. It's also possible to use CGLib proxies which don't require interfaces.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.