Spring Bean Scopes Cheat Sheet

Bean Scopes Overview

Scope	Description	Example Usage
Singleton	Default scope; a single instance per Spring IoC container.	@Bean public MyBean myBean() { return new MyBean(); }
Prototype	Creates a new instance each time a bean is requested.	@Bean @Scope("prototype") public MyBean myBean() { return new MyBean(); }
Request	A new bean instance is created for each HTTP request.	@RequestScope public MyBean myBean() { return new MyBean(); }
Session	A new bean instance is created for each HTTP session.	@SessionScope public MyBean myBean() { return new MyBean(); }
Application	A singleton instance per ServletContext; shared across the entire application.	@ApplicationScope public MyBean myBean() { return new MyBean(); }
Websocket	A new bean instance is created for each WebSocket session.	@Scope(value = "websocket", proxyMode = ScopedProxyMode.TARGET_CLASS) public MyBean myBean() { return new MyBean(); }

Conclusion

Understanding bean scopes is essential for managing the lifecycle and visibility of beans in a Spring application. This cheat sheet summarizes the key scopes and their usage.