How exactly works the Spring session scope of a bean? what is the default scope of a bean in the web context?

Question

I am studying Spring MVC and I have the following doubts:

1. What exactly is the purpose of the session scope?

Reading the documentation I know that this scopes a bean definition to an HTTP session. Only valid in the context of a web-aware Spring ApplicationContext. And also that a new instance is created once per user session.

But when exactly is it used? and for what purpose? Can you make a practical example?

2. In Spring MVC what is the default scope in the web context?

I know that in Spring the default scope for a bean is singleton but what about the scope of a bean in the web context?

Answer 1

Ans 1) session scope is very similar to HttpSession scope. Beans instantiated based on session scope scope lives through the HTTP session. Similar to request scope, it is applicable only for web aware spring application contexts.

/** * Annotation-based configuration of session scope */  @Component @Scope("session")  public class ShopCart { } 

and then

@Inject private ShopCart cart; 

Ans 2) Default is Singleton everywhere.