It would not be possible to cover *every* corner of the Spring universe in a single volume. The Spring portfolio has grown too much. I tried to do that in the 1st edition and came close...tried again in the 2nd edition and couldn't do it because there was just too much to cover and not enough pages in the book. For the 3rd edition, I scaled back and decided to focus on the topics I feel are most important to someone learning Spring. Not that the other topics aren't important--they certainly are--but I didn't feel that they were core to the Spring story.