This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
Try looking at the investment in spring as learning good programming practice. The frameworks might come and go. So one should concentrate on the design patterns used behind the framework. Look at spring source code; it's well written. Code coverage is high. Test cases can teach one a thing or two about how to write good test cases.