The bean's scope

Pragya Keshap answered on February 18, 2023 Popularity 8/10 Helpfulness 1/10

answer The bean's scope

The bean's scope

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The Spring container is responsible for creating the bean's instances. How instances will be created by the Spring container are defined by scope. The default scope is singleton, that is, only one instance would be created per IoC container and the same instance would be injected. If you want to create a new instance each time it is requested, you can define the prototype scope for the bean.

Singleton and prototype scopes are available for all Spring-based applications. There are four more scopes available for web applications: request, session, application, and websocket. For later scopes, the application context should be web-aware. Spring Boot-based web applications are web-aware.

@Configuration
public class AppConfig {
 
    // no scope is defined so default singleton scope is 
    // applied.
    // If you want to define it explicitly, you can do that 
    // using
    // @Scope(value = ConfigurableBeanFactory.SCOPE_SINGLETON)
    // OR
    // @Scope(ConfigurableBeanFactory.SCOPE_SINGLETON)
    // Here, ConfigurableBeanFactory.SCOPE_SINGLETON is string 
    // constant, which
    // value is "singleton". You can use the string also,
    // better to avoid it.
    @Bean 
    public SingletonBean singletonBean() {
        return new SingletonBean();
    }
    @Bean
    @Scope(ConfigurableBeanFactory.SCOPE_PROTOTYPE)
    public PrototypeBean prototypeBean() {
        return new PrototypeBean();
    }
    @Bean
    @Scope(value = WebApplicationContext.SCOPE_REQUEST, 
           proxyMode = ScopedProxyMode.TARGET_CLASS)
    // You need a proxyMode attribute because when web-aware 
    // context is
    // instantiated, you don't have any HTTP request. 
    // Therefore, 
    // Spring injects the proxy as a dependency and 
    // instantiate the bean when HTTP request is invoked.  
    // OR, in short you can write below which is a shortcut for 
    // above
    @RequestScope
    public ReqScopedBean requestScopedBean() {
        return new ReqScopedBean();
    }
}

https://www.baeldung.com/spring-bean-scopes

Popularity 8/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: java scope

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Contributed on Feb 18 2023

Pragya Keshap

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