Will the previous write operations in table A and table B be rollbacked?
Yes, unless your saveAndFlush() methods have their own transactions (i.e. with propagation = REQUIRES_NEW).
If they’re all part of the transaction you started in saveAndGenerateResult(), all modifications made to the database will be rolled back in case of failure.
For more information: Spring – @Transactional – What happens in background?
Spring @Transactional – isolation, propagation