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The @Import annotation in Spring Boot

The @Import annotation is used to import one or more configuration classes into the current configuration class or configuration file. This annotation is particularly useful when you want to modularize your configuration and reuse existing configuration classes in different parts of your Spring Boot application.

Let’s create a simple example to demonstrate the usage of @Import annotation.

Step 1: Create Configuration Classes

First, let’s create a couple of configuration classes that we want to import.

Step 2: Create Main Configuration Class

Now, let’s create a main configuration class where we’ll use the @Import annotation to import the DatabaseConfig and SecurityConfig classes.

In this example, AppConfig is the main configuration class, and it imports DatabaseConfig and SecurityConfig using the @Import annotation.

Step 3: Use the Main Configuration Class in the Application

Now, you can use AppConfig as the main configuration class when starting your Spring Boot application.

Here, @SpringBootApplication is used to enable the Spring Boot features, and the @Import(AppConfig.class) annotation is used to import the configuration from AppConfig.

Step 4: Test the Application

You can now run your Spring Boot application and test if the configurations from DatabaseConfig and SecurityConfig are properly imported and applied.

This is a basic example, and in a real-world scenario, you might have more complex configurations that you want to modularize and reuse across different parts of your application. The @Import annotation provides a clean way to achieve this modularization in your Spring Boot projects.

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