Do you cover in your book when it makes more sense to use Websphere and when an opensource J2EE implementation such as JBoss would work just as well?
I think it is not easy to perform environment migration, especially changing server. Just consider, if currently, I use Oracle 9i. But then, my company is decided to change to DB2, what happens? As you can forsee, since Oracle and DB2 are developed by 2 vendors, even the same set of SQL standards (ANSI 99) are enforced in the 2 DBs, you need to do a lot of work because they use different system architectures for data manipuliation. Just what JBoss, WebSphere and WebLogic do! They all are fully compiled with J2EE specification, however, they did many propriority stuffs. Thus, it is not really easy to find a book that covers all aspects for different vendors!!! Changing software platform is always a painful action. Nick.