Learning Spring Boot from Zero to Cloud: Part 30 – Bean lifecycle PostConstruct, PreDestroy, others

Welcome to this video in our Spring Boot series! 🎯
In this episode, we explore how Spring manages the lifecycle of beans, focusing on the powerful annotations @PostConstruct and @PreDestroy.

This is part of a larger series where we help developers master Spring Boot through concise, practical, and real-world examples.

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🔍 What You’ll Learn in This Video

👉 What is the Spring Bean lifecycle?
👉 Why initialization and destruction matter
👉 How @PostConstruct and @PreDestroy work
👉 Real-world examples: DB connections, cache setup
👉 Alternative lifecycle management: InitializingBean, @Bean(initMethod, destroyMethod)
👉 The role of scopes in lifecycle events
👉 How to handle prototype bean cleanup
👉 Best practices and common pitfalls

⏱️ Timestamps

00:00 – 🎬 Introduction
00:49 – 🔄 What Is a Bean Lifecycle?
01:42 – ❓ Why It Matters
03:02 – ✳️ @PostConstruct Explained
03:36 – 🔚 @PreDestroy Explained
04:23 – 🧭 Lifecycle Diagram
04:52 – 🛠️ Examples: DB Pool, Cache
08:19 – ⚠️ Common Pitfalls
09:13 – 🔁 Alternative Hooks (interfaces)
10:35 – 🧩 Custom initMethod/destroyMethod
12:48 – 📊 Scope Interaction Table
13:29 – 🧪 Prototype Bean Use Case
15:05 – 📝 Summary & Advices
18:41 – 👋 Practice with Code