What @Transactional Actually Does: Proxies, Thread-Bound Connections and the Rules of Rollback
One annotation, and Spring opens a database transaction, shares its connection with every repository you call, and decides whether to commit or roll back. This article traces a single @Transactional call through the proxy, TransactionInterceptor and the transaction manager, then uses that model to explain propagation, isolation, rollback rules and the pitfalls that follow from them.
