DefaultApolloException: No data and no error was returned

Help
,
1

From the PlayGround, when i pass the below payload I get correct output, but from Kotlin with Generated Model class, I am not clear how to pass the request object and capture it into response java object

query getLoyaltyInfoForCustomer {
  loyalty {
    earnPoints (iapAsinIdentifier: { asin: "TEST234dfs" }){
      pointsAmount
    }
    pointsBalance {
      availableBalance
    }
  }
}

With Below Kotlin code, the data is always null

val apolloClient = ApolloClient.Builder().serverUrl("http://myserver:8000/graphql-ide").build();

val myData = apolloClient.query(GetLoyaltyInfoForCustomerQuery(asin = "Hi")).execute()
println(myData.data); // Always prints null on console

Reference - Generated Model Class from Apollo Plugin

//
// AUTO-GENERATED FILE. DO NOT MODIFY.
//
// This class was automatically generated by Apollo GraphQL version '4.0.0-alpha.2'.
//
package com.mycompany.model

import com.amazon.appstore.cube.model.adapter.GetLoyaltyInfoForCustomerQuery_ResponseAdapter
import com.amazon.appstore.cube.model.adapter.GetLoyaltyInfoForCustomerQuery_VariablesAdapter
import com.amazon.appstore.cube.model.selections.GetLoyaltyInfoForCustomerQuerySelections
import com.apollographql.apollo3.annotations.ApolloAdaptableWith
import com.apollographql.apollo3.api.CompiledField
import com.apollographql.apollo3.api.CompositeAdapter
import com.apollographql.apollo3.api.CustomScalarAdapters
import com.apollographql.apollo3.api.Query
import com.apollographql.apollo3.api.json.JsonWriter
import com.apollographql.apollo3.api.obj
import kotlin.Boolean
import kotlin.Int
import kotlin.String
import kotlin.Unit

public data class GetLoyaltyInfoForCustomerQuery(
  public val asin: String,
) : Query<GetLoyaltyInfoForCustomerQuery.Data> {
  public override fun id(): String = OPERATION_ID

  public override fun document(): String = OPERATION_DOCUMENT

  public override fun name(): String = OPERATION_NAME

  public override fun serializeVariables(
    writer: JsonWriter,
    customScalarAdapters: CustomScalarAdapters,
    withBooleanDefaultValues: Boolean,
  ): Unit {
    GetLoyaltyInfoForCustomerQuery_VariablesAdapter.serializeVariables(writer, this,
        customScalarAdapters, withBooleanDefaultValues)
  }

  public override fun adapter(): CompositeAdapter<Data> =
      GetLoyaltyInfoForCustomerQuery_ResponseAdapter.Data.obj()

  public override fun rootField(): CompiledField = CompiledField.Builder(
    name = "data",
    type = com.amazon.appstore.cube.model.type.Query.type
  )
  .selections(selections = GetLoyaltyInfoForCustomerQuerySelections.__root)
  .build()

  @ApolloAdaptableWith(GetLoyaltyInfoForCustomerQuery_ResponseAdapter.Data::class)
  public data class Data(
    public val loyalty: Loyalty?,
  ) : Query.Data

  public data class Loyalty(
    public val earnPoints: EarnPoints?,
    public val pointsBalance: PointsBalance?,
  )

  public data class EarnPoints(
    public val pointsAmount: Int?,
  )

  public data class PointsBalance(
    public val availableBalance: Int?,
  )

  public companion object {
    public const val OPERATION_ID: String =
        "56c84d29714c7e21cc9ca655fe9160c63b575d79429745cf3f48647c112ac6c9"

    /**
     * The minimized GraphQL document being sent to the server to save a few bytes.
     * The un-minimized version is:
     *
     * query getLoyaltyInfoForCustomer($asin: String!) {
     *   loyalty {
     *     earnPoints(iapAsinIdentifier: {
     *       asin: $asin
     *     }
     *     ) {
     *       pointsAmount
     *     }
     *     pointsBalance {
     *       availableBalance
     *     }
     *   }
     * }
     */
    public val OPERATION_DOCUMENT: String
      get() =
          "query getLoyaltyInfoForCustomer(${'$'}asin: String!) { loyalty { earnPoints(iapAsinIdentifier: { asin: ${'$'}asin } ) { pointsAmount } pointsBalance { availableBalance } } }"

    public const val OPERATION_NAME: String = "getLoyaltyInfoForCustomer"
  }
}
2

Hi!

Your code looks correct to me.

Is it possible that the asin you’re passing (Hi) has 0 results, and therefore a null data is correct? Maybe you have something in myData.errors?

3

Hi,

As of now we don’t have any logic implemented on GraphQL Server and just return hard coded response irrespective of the input. I have tried the same with Play Ground environment and adding a debug point, i could verify that both data and error is null. Refer screenshot

Screenshot 2023-09-14 at 9.48.42 AM
Screenshot 2023-09-14 at 9.48.42 AM1291×301 73.4 KB

4

Adding Response from Playground with input “Hi”

Screenshot 2023-09-14 at 10.00.39 AM
Screenshot 2023-09-14 at 10.00.39 AM1231×303 30.2 KB

5

I got it resolved. The problem was with the endpoint i was hitting.

From my code, I was hitting http://localhost:8280/graphql-ide instead of http://localhost:8280/graphql

But honestly i would expect a error or exception if the endpoint was wrong. No Data and No Error made it quite hard to debug.

Follow up question, I get the below as response and how do i cast it to a model class

Data(loyalty=Loyalty(earnPoints=EarnPoints(pointsAmount=12), pointsBalance=PointsBalance(availableBalance=73)))

How do i cast myData.data to my auto generated Loyalty model class ?

6

Glad you found the culprit!

Thanks to your screenshot I can see that you are using Apollo Kotlin v4, with which exceptions will be in ApolloResponse.exception (here we can see that there is a "No data and no error was returned" exception).
If you’d like the exception to be thrown, you can use ApolloResponse.dataOrThrow().
More context about this here.

How do i cast myData.data to my auto generated Loyalty model class ?

You can find it in myData.data.loyalty.
(myData should be renamed response for more clarity).

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