Configuration Externalization: A Code Example

Now that the architecture is clear, here is an implementation in Java.

Using Spring Cloud Config

Spring Cloud Config is a common tool for this pattern in the Java world. It provides both halves: a server that holds the settings, and a client that reads them.

The server is a normal Spring Boot application with one annotation added.

@SpringBootApplication
@EnableConfigServer
public class ConfigServer {
    public static void main(String[] args) {
        SpringApplication.run(ConfigServer.class, args);
    }
}

The `@EnableConfigServer