How to inject a root-level defined configuration list with complex objects

[sebthom]

Hi everyone, I am trying to inject a configuration like this into a service:

targets[0].url=...
targets[0].label=...
targets[0].enabled=true
targets[1].url=...
targets[1].label=...
targets[1].enabled=true

1. Using @ConfigProperty complains about a missing converter SRCFG02007: No Converter registered for class Target:

   @ConfigProperty("targets")
   List<Target> targets

2. Using @ConfigMapping with an empty prefix tries to map all other properties from application properties with xyz does not map to any root. I know I could disable validation globally using smallrye.config.mapping.validate-unknown=false but this is not desirable.

   @ConfigMapping(prefix = "")
   public interface TargetConfig {
      List<Target> targets();
   
      @ConfigGroup
      interface Target {
         String url();
         String label();
         boolean enabled();
      }
   }
   
   @Inject
   TargetConfig targetConfig;

3. I also tried this but it injects nothing:

   @ConfigMapping(prefix = "targets")
   List<Target> targets;

4. This works neither:

   @ConfigMapping(prefix = "targets")
   interface Targets extends List<Target> {
   }
   
   @Inject
   Targets targets;

Thanks for any hints!