Comment by aidenn0

You missed the step of "understand why each technology exists."

If you understand why a technology exists you are gaining an understanding of problems, and after repeating a few times over a decade you may see patterns in problems that are being solved.

It's easy to mock "AbstractSingletonProxyFactoryBean" but whoever created it was not being wholly onanistic, and if you can't understand why it was created, you are going to be in trouble if you ever create your own framework.