quarkus-bug-config-list

Sample app to demonstrate a bug in Quarkus 3.17.2 when overriding list config properties. This demo contains an application.yaml file with the following config:

countries:
  - de

Running the application only prints the value of this countries config.

According to the Quarkus documentation, config properties can be overwritten via system properties, such as:

mvn compile quarkus:dev -Dcountries=nl

This does not work in Quarkus 3.17.2, you can see the value printed is the default in the application.yaml:

2024-12-03 11:01:11,937 INFO  [io.quarkus] (Quarkus Main Thread) Installed features: [cdi, config-yaml]
countries: [de]

However, this used to work in Quarkus 3.16. To test, switch to the branch quarkus3.16 and run the command again:

git checkout quarkus3.16
mvn compile quarkus:dev -Dcountries=nl

you can now see the correct value in the console:

2024-12-03 11:03:18,675 INFO  [io.quarkus] (Quarkus Main Thread) Installed features: [cdi, config-yaml]
countries: [nl]

Notes

This only seems to happen with config properties specified as a yaml list. String and boolean properties can be overridden as expected.