As the saying goes: the more I know the more I don't know.
Came to the conclusion that I absolutely don't know the Spring framework, in particular IoC. And the need to work. The gugleniya for this reason does not give anything good. The material in the Russian Wikipedia is unclear. The introductory article do not cover the total necessary for understanding. Even just the concept I can't understand, not to mention the concrete implementation in the same Spring E. So I decided to turn to people who know. Which books\\materials\\article, anything you need to read to understand the IoC? Preferably with examples in Spring. But it is possible and without them. They say that there is good documentation on the Spring. But to begin to read it, it is necessary to understand basic things, the meaning of IoC, his concept. Where learn these skills?