Why are you assuming you cannot write your own library and use it with Spring? It's not an either/or, just like most frameworks are. You are framing it as if there is only one way to do it in spring.

Please do not project things like "you guys don't even know..". I'm one of "you guys" , and have built production code in a variety of languages and frameworks. So this "you guys" knows exactly what he/she is talking about.