Junior — Middle

Explain the process of creating, initializing, and destroying a bean in Spring Framework.

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Answer from AI

The process of working with beans in the Spring Framework involves three main stages:

Creation (Instantiation) — Spring creates an instance of the bean class, usually by calling the constructor.
Initialization — after creation, Spring performs dependency injection, sets properties, calls methods annotated with annotations like @PostConstruct, and applies any BeanPostProcessors for additional configuration.
Destruction — when the Spring context is shutting down, it calls cleanup methods, such as those annotated with @PreDestroy, or methods specified in the configuration, to properly release resources.

Example:

@Component
public class MyBean {
    @PostConstruct
    public void init() {
        System.out.println("Bean initialized");
    }

    @PreDestroy
    public void cleanup() {
        System.out.println("Bean is being destroyed");
    }
}

Thus, Spring manages the bean's lifecycle, ensuring its creation, configuration, and proper shutdown.

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