Spring Boot Version

plugins {
    id 'java'
    id 'org.springframework.boot' version '3.1.0'
    id 'io.spring.dependency-management' version '1.1.0'
    id 'org.asciidoctor.jvm.convert' version '3.3.2'
}

Problem

When I inject URI format's value to application.yml file, the value has a different String iteral value according to the key's hypen count.

What I did

I deployed a java spring application in a K8S cluster, and set a URI format's value as a pod container's environment. And I received the injected value in the application.yml file, Here is my sample codes.

// a part of k8s deployment
env:
    - name: EXAMPLE_SERVICE_URL
      value: "http://172.0.0.1:8080"

// Spring's Application Yaml file
outer-example-service:    // case 1
    url: "http://${EXAMPLE_SERVICE_URL}:8080"

outer-service:    // case 2
    url: "http://${EXAMPLE_SERVICE_URL}:8080"

// Spring's Value Annotation
@Slf4j
@Service
public class OuterExampleService
{
    public OuterExampleService (
        @Value("${outer-example-service.url}")
        String exampleUrl
    ) {
        log.info(
            "exampleUrl: {}", exampleUrl
        )
    }
}

I tested the following two cases. (All settings that are not mentioned are the same.)

  1. Using two hypen at the key name of application.yml file (ex. outer-example-service)
  2. Using one hypen at the key name of application.yml file (ex. outer-service)

The case 1's exampleUrl is this. http://http://127.0.0.1:8080:8080 The case 2's exampleUrl is this. http://127.0.0.1:8080

The difference is only the count of hypen.

Is this an intended action of Spring's Profile Setting with Yaml file? I'm not sure this is a kind of bug or just a misusing case.

Comment From: wilkinsona

I believe this is a Spring Framework issue: https://github.com/spring-projects/spring-framework/issues/31707#issuecomment-1830260487.