Java Bean Bag

💡 Lesson Learned — Not a Prod Bug, But a Real Pain No, this wasn’t a production outage. Nobody screamed at me. But I sat for 3 hours wondering: “Why the heck is my @Transactional not rolling back!?” 😵‍💫 “Why is Redis cache not working?” 🤯 Turned out, the issue was one silent villain: 🧱 Self-invocation 🤷 What Is @Transactional ? If you're new: @Transactional = Tells Spring to start a DB transaction when a method is called. It’ll commit if everything’s okay. It’ll rollback if something fails. 🧠 Think of it like wrapping your code in: try { beginTransaction(); // your logic commit(); } catch(Exception e) { rollback(); } 🕵️ Real-Life Analogy — The Gateway Community 🏘️ Let me tell you about my society — it has a strict watchman at the gate. Here’s how it works: 🛂 Watchman = Spring Proxy 🏠 Your apartment = Your service class 🚪 Your room = A method inside that class 🏃 Scenario 1: Outsider Visits Your friend from outside...