java - How to discard changes in hibernate/JPA after Exception occur?

Question

how can I discard changes after Exception? I want to save recordB even when recordA failed to save.

//The transaction comes from else where, cannot modify it
@Transactional
void updateRecord{
    Record recordA = repository.findById(ida);
    Record recordB = repository.findById(idb);
    recordA.setXXX();
    recordB.setXXX();
    try {
        repository.saveAndFlush(recordA);
    } catch (Exception exp) {
        if (exp instanceof DataIntegrityViolationException) {
            entityManager.detach(recordA);
        } else {
            throw new RuntimeException(exp);
        }
    }
    repository.saveAndFlush(recordB);//got exception cause recordA still engaged
}

question from:https://stackoverflow.com/questions/65878726/how-to-discard-changes-in-hibernate-jpa-after-exception-occur

Answer 1

Can not be done in same transaction.

1: need to set globalRollbackOnParticipationFailure = true

2: start an new transaction with proper propagation, do everything and rollback within that transaction