This week's book giveaway is in the Mac OS forum. We're giving away four copies of a choice of "Take Control of Upgrading to Yosemite" or "Take Control of Automating Your Mac" and have Joe Kissell on-line! See this thread for details.
The book has many code examples and all the code in the book can be downloaded from the publisher site. I don't use any specific IDE in the book (or in my day job) but there is a section in the appendix that discusses the Grails support in the three major IDEs.
I don't cover Grails/Spring integration beyond what Grails already includes. Integrating existing Spring components with Grails is pretty easy to do but didn't really fit the scope of the book.