Without the configuration cache, this snippet is working

val catalog: VersionCatalog = versionCatalogs.named("hubdle")

val catalogDependencies: Provider<List<MinimalExternalModuleDependency>> = provider {
    catalog.libraryAliases.mapNotNull { catalog.findLibrary(it).getOrNull()?.orNull }
}

val hubdleCodegen: TaskProvider<GenerateHubdleTask> =
    tasks.register<GenerateHubdleTask>("generateHubdle")

hubdleCodegen.configure {
    group = "build"

    libraries.set(catalogDependencies)
    libraryAliases.set(provider { catalog.libraryAliases })
    pluginAliases.set(provider { catalog.pluginAliases })
}

But with config cache I get

* What went wrong:
Could not load the value of field `libraries` of task `:hubdle-gradle-plugin:generateHubdle` of type `com.javiersc.hubdle.logic.GenerateHubdleTask`.
> java.lang.NullPointerException (no error message)

Do you have a full stack trace? Nothing strikes me as obviously broken :(

Untitled

Hm, do you run your builds with

--configuration-cache-problems=warn

by chance? There is a serialization problem, because CC cannot serialize

MinimalExternalModuleDependency

Yes, I am using

warn

. I will try to create my own object and share the outcome this afternoon. Thank you!