ApplicationListener

Description: The ‘Application Listener’ in Spring is an interface that allows developers to receive and handle events occurring within the application. These events can be generated by various actions, such as application initialization, changes in bean states, or any other relevant event that needs to be monitored. Implementing application listeners enables a more reactive and decoupled architecture, where different components of the application can respond to events without being directly connected to each other. This promotes greater modularity and facilitates business logic management, as events can be handled asynchronously and in different parts of the application. Furthermore, event listening is fundamental for implementing design patterns like the Observer, where one object can notify other objects about changes in its state. In the context of Spring, developers can create their own listener classes that implement the `ApplicationListener` interface, allowing for customized responses to specific events. This feature is particularly useful in enterprise applications where interaction between different modules and services is crucial for the efficient functioning of the system.

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