Spring Bean Scopes Mastery

This project explores how Spring manages the lifecycle and number of instances for beans using the scope attribute.

Singleton vs Prototype

Feature	Singleton (Default)	Prototype
Instance Count	Only one instance per Spring Container.	A new instance every time the bean is requested.
Object Reference	obj1 == obj2 is True.	obj1 == obj2 is False.
Use Case	Stateless beans (Services, Daemons).	Stateful beans (User sessions, multi-threaded tasks).
Creation	Created during container startup (Eager).	Created only when requested (Lazy).

Project Structure

• org.spring.bean.scopes.singleton: Demonstrates shared object state.
• org.spring.bean.scopes.prototype: Demonstrates independent object states.

Key Experiments

The Address Test

By printing the object address in the Client class, we observe:

• Singleton: Address of obj1 == Address of obj2
• Prototype: Address of obj1 != Address of obj2

Modern Annotation Note

While this project uses XML, you can achieve the same result in modern Spring using:

@Component
@Scope("prototype")
public class HelloWorld { ... }