reading HFS&JSP, page 254 says (bottom box): "You do not configure session binding listeners in the DD". The errata says that should instead say: "You do not configure session binding listeners or session activation listeners in the DD".
But then, on page 261, there is a Dog class that implements both HttpSessionBindingListener and HttpSessionActivationListener. In the bottom of the page, the listener IS CONFIGURED in the DD, and the box right of it says that is MUST be configured because of the Activation listener. The errata doesn't say anything about this page.