Grails: how to structure transactions when I want to continue validating even after the transaction has already failed

Question

My users are uploading a csv or xls or whatever and each line is going to be an instance of a domain object I save. If any of the lines fail I want the whole thing rolled back,

Answer 1

here is what i am thinking:

1 . Set a flag that signals ALL CLEAR and commit the transaction manually at the end if all is clear.

or

2 . Commit each line in a separate transaction capturing errors of failed lines and skipping over failures.