I have a classical 3 tier layer web application.

My ui layer retrieves a persisted object by id, fills up the entity,
pass it the the business layer.
The dao can be called by the business layer.

I am using the open view pattern per request so each end of request
trigger an flush and a transaction commit.

However, in some cases i have some complex validation rule in my
business layer to validate my persistent object. If the validation
fails I would like to revert all the changes made to the persistent
object so that it does not get updated.

How can i do that ?

Thanks
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