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{
  "data": {
    "hello": "Hello World!"
  }
}

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@Configuration
class GraphQLConfig() {
    @Bean
    fun schemaParserDictionary(): SchemaParserDictionary {
        return SchemaParserDictionary()
                .add(IBike::class)
                .add(ICar::class)
    }
}

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query{
  getIVehicles{
    ... on Car{
      name
      price
      engineType
    }
    ... on Bike{
      name
      price

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{
  "data": {
    "getIVehicles": [
      {
        "name": "BMW X1",
        "price": 45000,
        "engineType": "PETROL"
      },
      {
        "name": "Ducati",

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mutation createCar($input: CarInput){
  createCar(input: $input) {
    name
  }
}

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{
  "errors": [
    {
      "message": "Internal Server Error(s) while executing query"
    }
  ],
  "data": null
}

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query{
  getCar(input: "B Class"){
    name
  }
}

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type Query{
    hello: String
    getCar(input: String) : Car!
}

type Mutation{
    createCar(input: CarInput): Car
}

type Car {

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@Service
class CarService {
    fun getCar(input: String): Car {
        return CarMap.cars[input]!!
    }

    fun createCar(input: CarInput): Car {
        val car = Car(input.name, input.price, input.engineType)
        CarMap.cars[input.name] = car
        return car

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open class CarNotFoundException(
        errorMessage: String? = "",
        private val parameters: Map<String, Any>? = mutableMapOf()
) : GraphQLException(errorMessage) {
    override val message: String?
        get() = super.message

    override fun getExtensions(): MutableMap<String, Any> {
        return mutableMapOf("parameters" to (parameters ?: mutableMapOf()))
    }