Can't get fetcher to be invoked in Kotlin, query always returns null

[koles]

I have a simple Kotlin app based on the Getting Started instructions.

Schema:

type Query {
    shows(titleFilter: String): [Show]
}

type Show {
    title: String
    releaseYear: Int
}

Kotlin code:

package demo

import com.netflix.graphql.dgs.DgsComponent
import com.netflix.graphql.dgs.DgsQuery
import com.netflix.graphql.dgs.InputArgument

@DgsComponent
class ShowsDataFetcher {
    private val shows =
            listOf(
                    Show("Stranger Things", 2016),
                    Show("Ozark", 2017),
                    Show("The Crown", 2016),
                    Show("Dead to Me", 2019),
                    Show("Orange is the New Black", 2013)
            )

    @DgsQuery
    fun shows(@InputArgument titleFilter: String?): List<Show> {
        print("showing shows!")
        return if (titleFilter != null) {
            shows.filter { it.title.contains(titleFilter) }
        } else {
            shows
        }
    }

    data class Show(val title: String, val releaseYear: Int)
}

However when I try to run the shows query using the graphiql UI the shows method is never invoked and the GraphQL API returns null:

Query:

query {
  shows {
    title
    releaseYear
  }
}

​
Response:

{
  "data": {
    "shows": null
  }
}

I found a few similar questions like #192 and #648 but in both cases the problem was caused by the shows() method not being declared public in Java, which doesn't seem to be applicable to my Kotlin code.

The repo with my code is available at https://github.com/koles/dgs-springboot-null.

I was able to reproduce it with DGS 5.4.3 and 4.9.16 (Kotlin 1.7.20).

[koles]

Solved - the declared package name in my data fetcher was not consistent with the actual directory structure.

It would be nice if DGS reported a warning when the schema includes parts that are not covered by any component.