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My guess would be that DatabaseConfig needs to be a nested property, since it's a bean that has `Property&lt;&gt;` fields, but these <https://docs.gradle.org/8.3/userguide/incremental_build.html#sec:task_input_output_runtime_api|can't be registered using the runtime API>.

This is the issue that hopefully adds the runtime API variant for nested types: <https://github.com/gradle/gradle/issues/6022>

Until then, if you want to define `DatabaseConfig` as input using the runtime API, you probably have to define the single properties as inputs or use the utility that is mentioned in one of the comments in that issue.

About `bundles.named...`, yes to use `named` the thing you want to refer to needs to already be registered. Depending on the intended usage, you could for example use `bundles.matching { it.name == "..." }` instead.

Ok.  Thanks for the information!  That helps