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How does the use of Scope in Spring help manage the lifecycle of beans?

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Answer from AI

In the Spring Framework, the use of Scope (visibility scope) allows managing the lifecycle of beans by defining how long and in what context a bean instance exists.

Main types of Scope:

  • singleton (default): One instance of the bean for the entire Spring container. Created at application startup and lives until shutdown.
  • prototype: A new instance is created each time the bean is requested.
  • request: One instance per HTTP request (for web applications).
  • session: One instance per HTTP session.
  • application: One instance per ServletContext.

Advantages of using Scope:

  • Optimizes resource usage (e.g., singleton saves memory).
  • Ensures correct bean behavior in different contexts (e.g., request scope for data related to a specific request).
  • Simplifies state and data flow management.

Example of declaring a bean with prototype scope:

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

Thus, Scope in Spring helps control the creation, lifetime, and visibility of beans in an application.

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