What events does ApplicationContext in Spring know?

The Spring ApplicationContext supports several important events that allow reacting to the lifecycle of the context and other system changes:

• ContextRefreshedEvent — triggered during the initialization or refresh of the ApplicationContext. Can be used to execute code after the context has fully loaded.
• ContextStartedEvent — called when the context is started, if it was previously stopped.
• ContextStoppedEvent — occurs when the context is stopped.
• ContextClosedEvent — triggered when the context is closed, for example, when the application is shutting down.
• RequestHandledEvent — an event related to handling an HTTP request in web applications.

You can also create custom events by inheriting from ApplicationEvent and publish them via ApplicationEventPublisher to implement custom logic.