Injecting a map of lists into configuration

Question

I am trying to inject a dynamic map of lists into my Quarkus application and not sure if this is possible. I have not seen any documentation from Quarkus on this matter, so I am wondering if the smallrye-config even supports it.

app:
  example:
  - key: KeyExample
    values:
    - test 1
    - test 2
    - test 3
  - key: KeyExample2
    values:
    - test 1
    - test 2
    - test 3

I am trying to avoid the following syntax and then performing post-processing on the configuration to achieve the desired effect:

app:
  example:
    - KeyExample;test 1
    - KeyExample;test 2
    - KeyExample;test 3
    - KeyExample2;test 1
    - KeyExample2;test 2
    - KeyExample2;test 3

Answer 1

Unfortunately, SmallRye Config does not support Map<V, List<?> directly (it can be added).

If you change the YAML slightly, it is possible to achieve the same result:

 app:
  example:
    KeyExample:
      values:
      - test 1
      - test 2
      - test 3
    KeyExample2:
      values:
      - test 1
      - test 2
      - test 3

And then you can provide a mapping for it like this:

@ConfigMapping(prefix = "app")
interface MapListConfig {
    Map<String, Lists> example();
    
    interface Lists {
        List<String> values();
    }
}

Feel free to open an enhancement in https://github.com/smallrye/smallrye-config/ to add the Map<V, List<?> support.