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Spring Boot Bean Initialization: Lazy vs Eager | Eager vs Lazy Bean Loading in Spring Boot

Welcome to Interview Mania – your go-to channel for mastering Java, Spring Boot, and microservices interview questions!

In this video, we take a deep dive into one of the most frequently asked Spring Boot interview topics: Lazy vs Eager Initialization of Beans. Whether you're a beginner or preparing for senior-level interviews, understanding how and when Spring initializes beans is absolutely essential.

We break down the difference between Lazy and Eager Initialization, how Spring Boot handles bean instantiation under the hood, and what happens during the application context loading phase. We also cover @Lazy annotations, how Eager loading affects startup time, and the performance implications of both approaches.

By the end of this video, you'll clearly understand:

What is Lazy Initialization in Spring Boot?

What is Eager Initialization in Spring Boot?

When to use Lazy vs Eager Initialization

Common mistakes and pitfalls

Interview-ready code examples

This topic is not just theory – it’s a real-world concept that can impact the performance, memory usage, and scalability of your Spring Boot applications.

Whether you're preparing for a Java Developer job interview, learning Spring Framework in-depth, or improving your backend architecture knowledge, this video has you covered.

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#HappyCoding
– Interview Mania

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