StackOverflowError on encoding to JSON with circe

Question

I am writing tests for my case classes and in the following test I have a StackOverflowError:

  test("ValuationRequest - Conversion between case object and Json works") {
    val caseObject = ValuationRequest(TIME_SERIES_INTRADAY, "", IntraDayIntervals.MIN_5)
    val jsonString = caseObject
      .asJson
      .printWith(Printer.noSpaces)

    decode[ValuationRequest](jsonString) must be(Right(caseObject))
  }

here's the stacktrace:

An exception or error caused a run to abort. 
java.lang.StackOverflowError
    at io.circe.syntax.package$EncoderOps$.asJson$extension(package.scala:10)
    at eventbus.ValuationRequest$.$anonfun$encodeRequest$1(ValuationRequestCases.scala:14)
....

This is the case code:

import AV_Enums.TimeSeriesFunctions.TIME_SERIES_INTRADAY
import AV_Enums.{IntraDayInterval, IntraDayIntervals, TimeSeriesType}
import cats.syntax.functor._
import io.circe.generic.auto._
import io.circe.generic.semiauto._
import io.circe.syntax._
import io.circe.{Decoder, Encoder}

case class ValuationRequest(function: TimeSeriesType = TIME_SERIES_INTRADAY, symbol: String, interval: IntraDayInterval = IntraDayIntervals.MIN_5)

object ValuationRequest {
  implicit val encodeRequest: Encoder[ValuationRequest] = Encoder.instance { case response@ValuationRequest(_, _, _) => response.asJson }
  implicit val decodeRequest: Decoder[ValuationRequest] = deriveDecoder[ValuationRequest].widen
}

These are the enums it uses:

sealed abstract class TimeSeriesType(val text: String) extends EnumEntry {}

sealed abstract class IntraDayInterval(val text: String) extends EnumEntry {}

object TimeSeriesFunctions extends Enum[TimeSeriesType] with CirceEnum[TimeSeriesType] {
  val values: immutable.IndexedSeq[TimeSeriesType] = findValues

  case object TIME_SERIES_INTRADAY extends TimeSeriesType("TIME_SERIES_INTRADAY")

  case object TIME_SERIES_DAILY extends TimeSeriesType("TIME_SERIES_DAILY")

  case object TIME_SERIES_WEEKLY extends TimeSeriesType("TIME_SERIES_WEEKLY")

  case object TIME_SERIES_MONTHLY extends TimeSeriesType("TIME_SERIES_MONTHLY")

}

object IntraDayIntervals extends Enum[IntraDayInterval] with CirceEnum[IntraDayInterval] {
  val values: immutable.IndexedSeq[IntraDayInterval] = findValues

  case object MIN_1 extends IntraDayInterval("1min")

  case object MIN_5 extends IntraDayInterval("5min")

  case object MIN_15 extends IntraDayInterval("15min")

  case object MIN_30 extends IntraDayInterval("30min")

  case object MIN_60 extends IntraDayInterval("60min")

}

I don't understand what is going on with this case, all the others work fine and are implemented the same way. Can anyone help?

Answer 1

Problematic line

Encoder.instance { case response@ValuationRequest(_, _, _) => response.asJson }

.asJson here requires Encoder[ValuationRequest] which is a recursive call. Any reason you cannot use deriveEncoder[ValuationRequest]?