Strangely enough, I just got access to the methods I mentioned in my previous post by doing the following:
1. Downloaded the free version of Application Manager (as suggested by another post in this forum). I needed to monitor things, especially lock contention, and this software looks like a neat tool.
2. Deployed the JBoss monitoring agent SAR which was bundled with the download. The deployment seemed to kickstart EntityLockMonitor successfully and I can now view all the stats referred to in the book.
Has anyone been able to activate EntityLockMonitor another way?