Describe the bug

As a Kotlin programmer, I would like to create an Exception that extends both GraphQLError and RuntimeException

data class KotlinGraphqlException(val msg: String, val e: Throwable? = null) : 
    RuntimeException(msg, e), 
    GraphQLError 
{
    override fun getErrorType() = ErrorType.ValidationError
}

This is possible in Java, but not in Kotlin because both GraphQLError and RuntimeException have an inherited message property

Work-around: we currently have to define this class in Java. It's the only Java class in our project :/

Request: add a base class for Kotlin users that extends both GraphQLError and RuntimeException

I could hack my way by extending graphql.schema.CoercingParseLiteralException that does it, but it's not semantically correct.