Kotlin types are lost on specific operations

[MartinX3]

With kotlin and smallyre sometimes I need to declare the type again.

Additional details

Examples:

• .transformToMulti { fetch(it.bananas).onItem().disjoint<Banana>() }
  Without <Banana> it doesn't know that I fetch the Bananas.
• .call { it -> if (it.type?.entityType == Apple) serviceApple.updateBy(it) else createUniFrom().nullItem<Apple>() }
  Without <Apple> it doesn't know that it should return a nullItem with this type.
  But shouldn't it know it already, because I return an Uni in the true case?
  PS: nullItem<Void> and nullItem<Unit> are working too, which confuses me more.
  There is .voidItem(), but that I would otherwise need to declare the type confuses me.
  Maybe the java code of smallrye confuses kotlin?

Maybe we need kotlin classes as a layer in smallrye which optimize the kotlin compatibility?
As far as I know the Quarkus Framework uses this approach.

PS: I like the word confusing

[heubeck]

Like the idea and would love to investigate, unfortunately, I'm blocked for the next month.
@MartinX3 how about meet at https://www.cloudland.org/ and discuss in person? ;)

[MartinX3]

@heubeck Sadly it's too expensive for me and I use Mutiny only for my job.
I don't use it in my volunteer tasks and my studies, so I also don't have time as well.

I found a new issue
It needs the type for the mapping function.
So .map(List<Double>::average) and .map { it.average() } are working, but .map(::average) throws an error.

    fun findAverageScoreByA(id: UUID): Uni<Double> =
        stream("b.aId", id).group().by { it.category.name }
            .onItem().transformToUniAndMerge { it.collect().asList() }.map { it.map(b::score).average() }
            .collect().asList().map(List<Double>::average)

[heubeck]

Thanks @MartinX3 ,
no issue, my own organization has a way to go as well in regards of official support on OSS contributions.

Just keep reporting, will care as soon as possible.