ConfigFileApplicationListener orgspringframeworkbootcontextconfigConfigFileApplicationListener is deprecated and can only be used as an EnvironmentPostProcessor

The class ConfigFileApplicationListener in the org.springframework.boot.context.config package is deprecated and can only be used as an EnvironmentPostProcessor. This means that instead of using ConfigFileApplicationListener directly, you should implement your own EnvironmentPostProcessor and use that to perform any necessary configuration file processing.

To implement your own EnvironmentPostProcessor, you need to create a class that implements the EnvironmentPostProcessor interface and override the postProcessEnvironment() method. In this method, you can perform any necessary configuration file processing based on the provided Environment object.

Here's an example of how you can implement your own EnvironmentPostProcessor:

import org.springframework.boot.SpringApplication;
import org.springframework.boot.env.EnvironmentPostProcessor;
import org.springframework.core.env.ConfigurableEnvironment;

public class MyEnvironmentPostProcessor implements EnvironmentPostProcessor {

    @Override
    public void postProcessEnvironment(ConfigurableEnvironment environment, SpringApplication application) {
        // Perform your configuration file processing here
    }
}

To use your EnvironmentPostProcessor, you need to register it in your Spring Boot application by adding a META-INF/spring.factories file in your resources directory. In this file, you can specify your EnvironmentPostProcessor implementation as follows:

org.springframework.boot.env.EnvironmentPostProcessor=com.example.MyEnvironmentPostProcessor

Make sure to replace com.example.MyEnvironmentPostProcessor with the fully qualified name of your EnvironmentPostProcessor implementation.

By implementing your own EnvironmentPostProcessor, you can perform any necessary configuration file processing without relying on the deprecated ConfigFileApplicationListener.