Kotlin support

Hi!

Awesome library I love it, I even dropped graphql-java-tools and graphql-spring-boot-started for it.

However, it would be awesome to have Kotlin support in the library. For example, it could automatically pick up annotations like: org.jetbrains.annotations.NotNull, which tells spqr which field is nullable and which is not.

Right now, I can’t even get the @GraphQLNonNull annotation to work in Kotlin:

@GraphQLQuery(description = "Logs a user in.")
    fun login(@GraphQLArgument(name = "username") username: @GraphQLNonNull String, @GraphQLArgument(name = "password") password: @GraphQLNonNull String): LoginResponse = loginService.login(username, password)

What can go wrong here? Also do you plan to support Kotlin?

My final question would be that, is it possible with this library that I don’t need to specify @GraphQLArgument(name = "username") in the example mentioned above? It could automatically infer the name from the name of the variable with the -parameter javac option enabled.

Thanks, Gabor

[williamboman]

I’ve published a POC for Kotlin support (it leverages runtime reflection) https://github.com/williamboman/graphql-spqr-kotlin. (I don’t recommend using it for any production code though, but great fit for hobby projects if you want to use Kotlin + graphql-spqr).

[stengvac]

For Kotlin 1.3.70+ as mentioned in KT-13228 when added the compiler argument -Xemit-jvm-type-annotations then @GraphQLNonNull works fine.