What are the different types of Spring Bean scopes?

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In Spring Framework, bean scopes define the lifecycle and visibility of a bean within the Spring container. The most common bean scopes are:

1. Singleton (Default)

   • Only one instance of the bean is created per Spring IoC container.

   • Shared and reused throughout the application context.

   • Ideal for stateless beans.

2. Prototype

   • A new instance of the bean is created every time it is requested from the container.

   • Useful for stateful beans where each use requires a fresh object.

3. Request (Web-aware scope)

   • One bean instance is created per HTTP request.

   • The bean is available only during the lifecycle of a single HTTP request.

4. Session (Web-aware scope)

   • One bean instance is created per HTTP session.

   • The bean is tied to the lifecycle of a user session.

5. Application (Web-aware scope)

   • One bean instance is created per ServletContext (application).

   • Shared across all requests and sessions in a web application.

6. Websocket

• One bean instance is created per WebSocket session.

Summary:

• Singleton: Single shared instance (default)

• Prototype: New instance on each request

• Request: Per HTTP request

• Session: Per HTTP session

• Application: Per servlet context

• Websocket: Per WebSocket session

Choosing the right scope is crucial for resource management and application behavior

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