Integrating Vaadin with Hibernate - problem

Vaadin 6 / 7 / 8 Framework Data Binding
1

Hello. I’m working in NetBeans. I created derby database and project with vaadin and hibernate. Later i created (by netbeans wizard) Hibernate utils, hibernate config file and mapping file.

Source codes:

Config : http://4programmers.net/Pastebin/1976
Mapping file : http://4programmers.net/Pastebin/1977
Utils : http://4programmers.net/Pastebin/1979

And model class : http://4programmers.net/Pastebin/1980

And class, where i try add the record : http://4programmers.net/Pastebin/1981

“add” is a button.

Any ideas why it’s wrong?

I’m sending errors returned after clik on “add” button.

Greetings