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What are different scopes a Spring bean can be?

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Anjali Sharma answered on January 3, 2023 Popularity 9/10 Helpfulness 4/10

answer What are different scopes a Spring bean can be?

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What are different scopes a Spring bean can be?

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There are 5 types of bean scopes available, they are:
1) singleton: Returns a single bean instance per Spring IoC container. 
2) prototype: Returns a new bean instance each time when requested. 
3) request: Returns a single instance for every HTTP request call.
4. Session
5. GlobalSession

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Contributed on Jan 03 2023

Anjali Sharma

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spring bean scope

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- Bean : Java object that is managed by the IoC container
- Singleton
    - default scope
    - one instance of object per context
    - You may declare two beans. But injecting them requires a lot more stuff (NOT RECOMMENDED)
    - Spring keeps the handle of the object
    - be careful with state data. since every class that have the dependency will have access to state data, it may get changed by some other thread.
- Prototype
    - Creates new instance every time it is referenced
    - useful for transient data or types that flex on states
    - Spring hands over that instance and releases its own handle, so when the task is finished, it is automatically disposed off by garbage collector
- Session
    - Works in web environment only
    - One instance of bean per user session
    - Helps to isolate session data from other sessions
    - Spring hands over that instance and releases its own handle, so when the session is finished, it is automatically disposed off by garbage collector
- Request
    - Works in web environment only
    - One instance of bean per user request
    - Spring hands over that instance and releases its own handle, so when the request is finished, it is automatically disposed off by garbage collector

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Contributed on Feb 18 2024

Innocent Iguana

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bean scope in spring

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// NormalClass.java (We will make the scope singleton)
@Scope(value=ConfigurableBeanFactory.SCOPE_SINGLETON) // Default, does not matter even if you specify it explicitly
// @Scope("singleton")
@Component
class NormalClass {
	// business logic
}

// PrototypeClass.java (We will make the scope prototype)
@Scope(value=ConfigurableBeanFactory.SCOPE_PROTOTYPE)
// @Scope("prototype")
@Component
class PrototypeClass {
	// business logic
}

// BeanScopesLauncherApplication.java
@Configuration
@ComponentScan("com.your.package")
public class BeanScopesLauncherApplication {
	public static void main(String[] args) {
		try (var context = 
				new AnnotationConfigApplicationContext
					(BeanScopesLauncherApplication.class)) {
			
			System.out.println(context.getBean(NormalClass.class)); // singleton will show same object address
			System.out.println(context.getBean(NormalClass.class)); // singleton will show same object address
			System.out.println(context.getBean(NormalClass.class)); // singleton will show same object address
			
			System.out.println(context.getBean(PrototypeClass.class)); // singleton will show different object address
			System.out.println(context.getBean(PrototypeClass.class)); // singleton will show different object address
			System.out.println(context.getBean(PrototypeClass.class)); // singleton will show different object address
			

		}
	}
}

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Contributed on Mar 24 2024

Innocent Iguana

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What are different scopes a Spring bean can be?

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