Resolver with customly mapped return type loses kotlin nullability when apiReturnType is used

[romash1408]

Steps to Reproduce

config

    generatedLanguage = GeneratedLanguage.KOTLIN
    generateApis = true
    apiReturnType = "reactor.core.publisher.Mono"
    customTypesMapping = mapOf(
        "ZonedDateTime" to "String",
    )

schema

type Query {
    nullable: ZonedDateTime
    mandatory: ZonedDateTime!
}

Expected Result

interface QueryResolver {

    @Throws(Exception::class)
    fun nullable(): reactor.core.publisher.Mono<String?>

    @Throws(Exception::class)
    fun mandatory(): reactor.core.publisher.Mono<String>

}

Actual Result

interface QueryResolver {

    @Throws(Exception::class)
    fun nullable(): reactor.core.publisher.Mono<String>

    @Throws(Exception::class)
    fun mandatory(): reactor.core.publisher.Mono<String>

}

non nullable return type of nullable() doesn't match the schema

Your Environment and Setup

• graphql-java-codegen version: 5.5.0
• Build tool: Gradle

[kobylynskyi]

Thanks @romash1408 for the contribution. I will include your change in the upcoming release. Stay tuned.