What areas of visibility of beans in Spring do you know?

In the Spring Framework, the following bean scopes are available:

• singleton: A single instance of the bean is created for each Spring context. It is the default scope. Lazy initialization can be enabled.
• prototype: A new bean instance is created each time it is requested.
• request: A new bean instance is created for each HTTP request. Only valid within a web application context.
• session: A new bean instance is created for each HTTP session. Only valid within a web application context.
• application: A single bean instance is created for the entire web application context (ServletContext). Only valid within a web application context.
• websocket: (Starting from Spring 4.0) A new bean instance is created for each WebSocket session lifecycle.

The most commonly used scopes:

Scope	Description	Initialization	Lifecycle
singleton	One instance per Spring ApplicationContext.	By default at context startup (can be made lazy).	Until the ApplicationContext is closed.
prototype	A new instance each time the bean is requested.	Each time the bean is requested.	Determined by the client (who requested the bean).
request	A new instance for each HTTP request.	When processing the first request that includes the bean.	Until the current HTTP request is completed.
session	A new instance for each HTTP session.	When first accessed within a session.	Until the HTTP session ends.
application	One instance for the entire ServletContext (web application).	When the ServletContext starts (can be made lazy).	Until the ServletContext is closed.
websocket	A new instance for each WebSocket session lifecycle.	When establishing a WebSocket session.	Until the WebSocket session ends.

Example of defining a bean with a specific scope:

// Example of defining a bean with prototype scope
@Component
@Scope("prototype")
public class MyPrototypeBean {

    // ... fields and methods ...
}