Importing config files across modules

I have two modules in the same project, one by another:

A
|-- application.yaml
|-- application-dev.yaml

B
|-- base-application.yaml
|-- base-application-dev.yaml

Been using custom EnvironmentPostProcessor to load base- config into A but with SB 2.4 I wanted to give config.import a try. But there are a few issues arisen.

(1) In A/application.yaml I’ve added the following:

spring:
  config:
    import: classpath:/base-application.yaml

In A/application-dev.yaml it’s respectively:

spring:
  config:
    import: classpath:/base-application-dev.yaml

Trying to start A fails with Config data location 'classpath:/base-application-dev.yaml' does not exist. That’s rather confusing considering that it does exist indeed and that classpath:/base-application.yaml is loaded just fine from the same location. To verify that, I made a typo in the file name and it failed for 'classpath:/bas-application.yaml' as expected.

Renaming base-application-dev.yaml to something profile-unrelated like some-file.yaml still fails with resource does not exist.

(2) If I don’t change A/application-dev.yaml at all, I do see that SB takes B/base-application-dev.yaml into account when loading classpath:/base-application.yaml and properly loads it. The application starts just fine with all properties. So clearly it does exist in (1). But now the ordering of property sources is not correct. Here’s what it is from environment:

...
application-dev.yaml
base-application-dev.yaml
base-application.yaml
application.yaml
...

base-dev overrides dev but application overrides base-application.

[scottfrederick]

As you said initially, there are a few issues here.

One is a bug that’s causing a confusing error message unrelated to modules and precedence of property loading. I’ve now split that out into #26147 so we can address that bug.

The rest of this discussion has to do with a specific problem you are trying to solve and whether your approach will work given the design of Spring Boot’s property loading. Let’s continue that discussion here.

[edudar]

What order do we load the resources and how do we make sure a developer can override a contributed value

Yeah, that’s an ultimate question in the late discussion here. I’ll close this one then as there are two tickets that cover it now.