The JMX Book is not part of the Subscription documentation bundle.
I agree that the doco page is very misleading as written:
Instead of buying the books individually, we recommend this advantageous and convenient subscription model. For about $99/year you get access to ALL our documentation ALL the time. Regardless of the number of books coming out and the number of revisions coming out.
What follows is a list of books, including the JMX book. The doc subscription is a terrific value, but I can understand people feeling deceived when the JMX Book isn't in there.
On the positive side, Chapter 2 of the Admin-Development guide is very thorough, and contains about all of the information you will need to use JMX with JBoss.
Yeah, i think they should change the description. Anyway, if the Admin-Development docu can provide equivalent guide to develop mbean for JBoss, then it's fine. This is still the ultimate goal.