I am absolutely unable to configure Tomcat to use Hibernate with Entity Manager, with (or without JTA). Bitronics documentation seems dated (the list of libraries to install do not match the distribution). I understand that this can be outside the scope of the book, but there is somewhere online a step by step description of how configure Hibernate + Bitronics under Tomcat? I would like to migrate an old application (native hibernate) to JPA instead of porting it to EclipseLink.

Can't help you migrating your applications, maybe try the Hibernate forum or stackoverflow.com