The Ultimate Guide to Understanding Spring Bean Scopes

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Discover the Secrets of Spring Bean Scopes in this Comprehensive Tutorial. Learn the difference between Singleton, Prototype, Request, Session and Global Session Scopes. Master the art of Bean Management and optimize your Spring application with the right Bean Scope. This video will take you on a journey of understanding the intricacies of Bean Scopes and provide you with the knowledge to make informed decisions for your next project. Don't miss out on this opportunity to become a Spring Bean Scope expert!

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0:00 Introduction
0:45: Pre-requisites for Spring Beans Scope
1:09 What is the Bean Definition?
1:32 Different Scopes Supported in Spring for Beans
1:52 What is Singleton Scope?
2:32 Singleton Scope Example (Visual)
3:15 What is Prototype Scope?
4:26 Prototype Scope Example (Visual)
4:50 What happens if Singleton Bean have Prototype Dependencies and vice-versa?
6:08 Web Aware Scopes: Request, Session, Application, WebSocket
7:10 How to Set Scope of a Bean using Annotation and XML?
7:58 Conclusion/Summary

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The Spring Framework is an application framework and inversion of control container for the Java platform. The framework's core features can be used by any Java application, but there are extensions for building web applications on top of the Java EE platform.(Wikipedia)

A BeanFactory is like a factory class that contains a collection of beans. The BeanFactory holds Bean Definitions of multiple beans within itself and then instantiates the bean whenever asked for by clients.

The BeanFactory is the actual container which instantiates, configures, and manages a number of beans. These beans typically collaborate with one another, and thus have dependencies between themselves. These dependencies are reflected in the configuration data used by the BeanFactory

BeanFactory also takes part in the life cycle of a bean, making calls to custom initialization and destruction methods.

Bean life cycle is managed by the spring container. When we run the program then, first of all, the spring container gets started. After that, the container creates the instance of a bean as per the request, and then dependencies are injected. And finally, the bean is destroyed when the spring container is closed. Therefore, if we want to execute some code on the bean instantiation and just after closing the spring container, then we can write that code inside the custom init() method and the destroy() method.

Spring Bean Scope in a nutshell refers to the lifecycle and visibility of a bean instance in a Spring-based application. Bean scopes determine the number of instances of a bean that will be created and how long the bean instances will exist. The five main scopes in Spring are: Singleton, Prototype, Request, Session, and Global Session.

Singleton: Only one instance of the bean is created and shared across the entire application.
Prototype: A new instance of the bean is created every time it is requested.
Request: A new instance of the bean is created for each HTTP request.
Session: A new instance of the bean is created for each HTTP session.
Global Session: A new instance of the bean is created for each global HTTP session, typically used for Portlets.
Choosing the appropriate bean scope depends on the specific requirements and design of the application.

#java #spring #springframework