Getting started with Spring Boot


I am new to MongoDB and I am trying to use it with my SpringBoot application. I have followed my tutorials online and have downloaded their code and got it execute.

However for whatever reason my project fails to be able to print out
RequestMappingHandlerMapping : Mapped “{[/findAllBooks/{id}],methods=[GET]}”

I was wondering if anyone would be able to advise me if it is due to the nature of my project structure .
I wasn’t sure if my SpringBootMain could see my other Repo and Controller classes