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.
I found Java SOA Cookbook(By Eben Hewitt)[Oreilly] quite useful for exam certification. 10-15% content of it outside exam syllabus(ESB and stuff like that) otherwise it is full of explanatory examples(The way Oreilly Cookbooks are written).