Convention Over Configuration is Nice... Except When It Isn't

Convention over configuration should lead to predictability. This breaks down when the default behavior of a system is unexpected. Take Guice for example. Guice will automatically bind to a class if the only constructor is a zero-argument constructor. This will happen even if the constructor is private.

This is not the path of least surprise when I forget to configure the behavior. I don't mind there being default behavior, I would just like to be able to turn it off. Moreover, I would like the opportunity to turn certain features off.

Private should mean private at least.