Play-json 2.7.1: java.lang.NoSuchMethodError

Question

在将play升级到2.7.0之后，我开始面临一个运行时错误：

[info] com.mycompany.controllers.HealthControllerSpec *** ABORTED ***
[info]   java.lang.NoSuchMethodError: play.api.libs.json.JsonConfiguration$.apply$default$2()Lplay/api/libs/json/OptionHandlers;
[info]   at com.mycompany.util.json.SnakeCase.$init$(SnakeCase.scala:41)
[info]   at com.mycompany.util.playframework.controllers.HealthView$.<init>(HealthView.scala:15)
[info]   at com.mycompany.util.playframework.controllers.HealthView$.<clinit>(HealthView.scala)
[info]   at com.mycompany.util.playframework.controllers.HealthController.<init>(HealthController.scala:25)
[info]   at com.mycompany.util.playframework.controllers.HealthControllerSpec.$anonfun$new$2(HealthControllerSpec.scala:30)
[info]   at org.scalatest.OutcomeOf.outcomeOf(OutcomeOf.scala:85)
[info]   at org.scalatest.OutcomeOf.outcomeOf$(OutcomeOf.scala:83)
[info]   at org.scalatest.OutcomeOf$.outcomeOf(OutcomeOf.scala:104)
[info]   at org.scalatest.Transformer.apply(Transformer.scala:22)
[info]   at org.scalatest.Transformer.apply(Transformer.scala:20)

有人能给我讲道理吗？

HealthView

case class HealthView(app: String, description: String, version: Option[String])

object HealthView extends SnakeCase {

  def apply(config: Configuration): HealthView =
    HealthView(
      config.get[String]("app.name"),
      config.get[String]("app.description"),
      config.getOptional[String]("app.version")
    )

  implicit val format: OFormat[HealthView] = Json.format[HealthView]

}

SnakeCase

trait SnakeCase {

  implicit val jsonConfig: Aux[Json.MacroOptions] = JsonConfiguration(SnakeCaseNaming)

}

小版本的版本应该是二进制兼容的。

Answer 1

正如特拉维斯·布朗( Travis Brown )所指出的，你有版本冲突。

正如在Play项目中包含了一个play-json一样，您不应该有另一个对play-json的依赖。

如果你有(因为我有一个多模块的项目)，确保主要版本适合。

例如在plugins.sbt中

addSbtPlugin("com.typesafe.play" % "sbt-plugin" % "2.7.0")

并作为依赖项(不是在游戏模块中！)：

"com.typesafe.play" %% "play-json" % "2.7.1"