Blog Spring Boot

Harnessing the Power of Custom PropertySources in Spring Boot


Introduction

Spring Boot provides a powerful and flexible configuration system. One of the key components of this system is the PropertySource abstraction, which represents a source of configuration properties. In this blog post, we’ll explore how to create a custom PropertySource and use it in a Spring Boot application.

What is a PropertySource?

In Spring, a PropertySource is a source of name-value pairs that the Spring Environment can use to configure properties. Spring Boot uses PropertySources to load configuration properties from various sources, such as application properties files, environment variables, and command-line arguments.

Creating a Custom PropertySource

You can create a custom PropertySource by extending the PropertySource class and implementing the getProperty method. This method should contain the logic to retrieve the property value from your custom source.

Here’s a basic example:

import org.springframework.core.env.PropertySource;

public class CustomPropertySource extends PropertySource {

    public CustomPropertySource(String name) {
        super(name);
    }

    @Override
    public Object getProperty(String name) {
        // Implement your custom logic to retrieve the property value
        // For example, you could fetch the property value from a database or a remote server
        return null;
    }
}

Registering the Custom PropertySource

Once you’ve created your custom PropertySource, you can register it with the SpringApplication:

import org.springframework.boot.SpringApplication;
import org.springframework.core.env.StandardEnvironment;

public class MyApplication {

    public static void main(String[] args) {
        SpringApplication app = new SpringApplication(MyApplication.class);
        
        StandardEnvironment environment = new StandardEnvironment();
        environment.getPropertySources().addFirst(new CustomPropertySource("custom"));
        
        app.setEnvironment(environment);
        app.run(args);
    }
}

In this example, we’re creating a new CustomPropertySource and adding it to the Environment of the SpringApplication. The CustomPropertySource will be consulted before any other PropertySources when looking up properties.

Conclusion

Creating a custom PropertySource in Spring Boot allows you to load configuration properties from various sources, such as databases, remote servers, or other custom sources. This can provide a lot of flexibility and power in managing your application’s configuration.

Remember, the actual implementation of your custom PropertySource will depend on your specific use case and environment. Happy coding!


I hope this draft helps you get started on your blog post. Let me know if you need further assistance! 😊

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Neelabh

About Author

As Neelabh Singh, I am a Senior Software Engineer with 6.6 years of experience, specializing in Java technologies, Microservices, AWS, Algorithms, and Data Structures. I am also a technology blogger and an active participant in several online coding communities.

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