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Id problem in annotation based mapping when using xml based id.

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Hibernate Python Linux
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Ok first the xml:

Now the annotated classes:

What I need is to switch between the ids but it doesn't work as i figured.
if I run this i got the exception:
org.hibernate.AnnotationException: No identifier specified for entity: eu.gdimbh.cardea.database.entity.DataCategory

I read somewhere that it is possible to mix annotation and xml. But either that is not true or I am doing something wrong.
I hope i am doing something wrong cause i got no other idea how to switch through ids.

Thanks in advance.

EDIT: Got it solved.
Mapping was wrong.
I used:

and it seems to work.

Edit 2: For future reference. Dump this approach and use uuids. If anyone won't get a better idea.
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