Hey, here an update on my topic.
I could solve the problem. I created a new Project without App Engine. Now the persistence.xml gets used like expected. App Engine caused, that datanucleus instead of hibernate were used. Regards -- You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/Bi-7F3cgwOYJ. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.