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This repository was archived by the owner on Sep 17, 2025. It is now read-only.
This repository was archived by the owner on Sep 17, 2025. It is now read-only.

NullPointerException on swagger creation #814

@kalirus

Description

@kalirus

Swagger creation fails with NullPointerException if one class has reference to itself, for example:

  case class ClassA(name: String, parent: Option[ClassA])

Full test case:

import derevo.circe.{decoder, encoder}
import derevo.derive
import ru.tinkoff.tschema.swagger.{MkSwagger, Swagger}
import ru.tinkoff.tschema.syntax._

object definitions {

  @derive(encoder, decoder, Swagger)
  case class ClassA(name: String, parent: Option[ClassA])

  def api = tagPrefix("module") |> (operation("test") |> get |> complete[ClassA])
}

object TestModule {

  import definitions._

  trait ModuleApi {
    def test: ClassA
  }

  object ModuleApiImpl extends ModuleApi {
    override def test: ClassA = {
      ClassA(
        name = "John Doe",
        parent = Some(ClassA(
          name = "John Doe Sr.",
          parent = None)
        )
      )
    }
  }

  def swagger = MkSwagger(api)
}

object Test {

  def main(args: Array[String]): Unit = {
    TestModule.swagger // throw java.lang.NullPointerException: Cannot invoke "ru.tinkoff.tschema.swagger.SwaggerTypeable.typ()" because the return value of "shapeless.Lazy.value()" is null
  }
}

The problem occurred when moving from older version 0.10.6 to latest 0.15.2 (reproduces on 0.15.2, didn't reproduce on 0.10.6)

Java 17.0.1, Scala 2.13.10

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