Java EE (Java Enterprise Edition) General Discussion

The tutorial has been good to this point. Complicated setup so it says a lot for the tutorial that I was able to get it all working to this point...

In ch.3, section "Specifying a web resource reference", step 1 it says:
"Select the WAR (created in Chapters 11 through 22)."

I'm on ch 3, not 11. Why jump ahead? Confusing.

So I jump ahead to ch 11.
I managed to get through everything until step 6a:
"Add the listener class listeners.ContextListener"

Dang. No instructions on how to do that! After a couple hours trying, am now dead in the water with no help.

Sorry if I'm missing something obvious. Any ideas?
Thankyou.