Can't see where this 'magic' comes from. IoC frameworks are not rocket science. Everything is very-well documented and pretty straightforward.

> dependency injection frameworks are an unnecessary and overcomplicated way of achieving it.

But why? I don't want to write my own DI framework for each new project.

I'd better add one dependency, put some @Autowired (and other well-documented) annotations and continue writing business logic.

Aforementioned 'magic' is basically creating a context, scanning all annotations, registering beans, instantiating them (calling constructors), then injecting them.