I'm studying the O'Reilly book 'Enterprise JavaBeans' by Monson-Haefel (in conjunction with the spec) for the exam and find the material first rate. However there are a good many little typo's in the code that, while easily detectable,
are somewhat annoying. I skimmed the sample of the Kathy/Bert book, also by O'Reilly, and the content looks fantastic but I do hope O'Reilly proofs it well before it hits the press (not that I wouldn't pay good money to have a copy, typo's and all, in my hands right now).