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database access with Vaadin
To clarify a bit of the terminology: JPA is a specification, Hibernate is an implementation of that specification. JPA isn't exactly meant for stateful applications like Vaadin, so getting everything to work properly can be a bit tricky. Don't worry, I've got some good news for you: I've recently published a library called Vaadin application foundation and one of the modules provided by the library is JPA based persistence which takes care of some of these tricky parts.
Take a look at the persistence module's documentation to get an idea how to set up and how to use the persistence module. You can also take a look at the example application to get some idea how to use the Vaadin AppFoundation library.
- Kim