JPA: looking for pattern to prevent edit of ownerId and created properties

My business and persistence tier architecture ideally should prevent editing of the ownerId, created, modified and version properties which are common to all my entities.
The ownerId is perhaps obviously the identifier of the user or group in a multi-user app who own the item of data and have rights to edit it. 'created' is the creation data when it was first written to the DB.
I can't set the 'modified' or 'version' fields to updateable="false" because they do need updating.
I don't want to use stored procedures, or interfaces for the entities. I'd like to keep it generic.
Do I have any other choice than to execute a native sql query to fetch the unchanged values?
Thanks
Adam

So I'll have to make 'created' and 'ownerId' parameters on the constructor with no setters and just hope I never have the need to set them.
But with 'modified' and 'version', the properties need updating. JPA needs to access the version field - does JPA do this by reflection? I'll run some experiments to see what happens.
With a setter on 'modified', I still want to protect it against change by anyone else. Well of course, I'm being a bit obstinate, if the 'modified' property is set every time by a listener, then it doesn't matter whether it was changed beforehand outside the persistence layer: that change will just get overwritten by the listener. Hmm.

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