Hi,
I saw your great blog.
I did not know the architecture of Java Persistence API in Java EE Platform.
That was my problem. You are right when you say there are people who
have blogs or webs treating to explaining things that they can not hold up.
I have build and run your application following your instructions
and everything was ok.
I have bookmarked your blog to go on studying the Persistence API
(if you do not mind).
Thanks for all, thanks for your blog and best regards,
Jose Alvarez de Lara
[Message sent by forum member 'josealvarezdelara' (josealvarezdelara)]
http://forums.java.net/jive/thread.jspa?messageID=333111