Would this be the right place to post errors in the book? If not, let me know where and I'd be glad to help update the information as I go through the book. I found one on page 108 of Head First EJB.
There are 4 columns in this matrix to choose from...
As the book has them: Stateful Session Beans - Stateful Session Beans - Entity Beans - Message-driven beans
As they should be: Stateless Session Beans - Stateful Session Beans - Entity Beans - Message-driven beans