Provide default config as extension

[stephan-strate]

I would like to provide default configuration if a capability is available in the application.
For example: If agroal is available, set jdbc max lifetime to 30 minutes.

I have tried to use the GeneratedResourceBuildItem, but some properties seem to get overriden by quarkus defaults at the end.
Is there any other way to achieve that?

[quarkus-bot[bot]]

/cc @radcortez (config)

[radcortez]

I don't think GeneratedResourceBuildItem works, because Quarkus config is not going to be able to see that file before starting the actual Config.

My recommendation it to use RunTimeConfigurationDefaultBuildItem, or even a customized io.quarkus.runtime.configuration.ConfigBuilder with StaticInitConfigBuilderBuildItem or RunTimeConfigBuilderBuildItem.

[stephan-strate]

Thank you :)

[stephan-strate]

This won't work for "fixed at build time" properties, right? Is these aswell?

[radcortez]

In that case, you can use a ServiceLoader and a SmallRyeConfigBuilderCustomizer:
https://smallrye.io/smallrye-config/3.11.4/config/customizer/