为Play+；注入构造函数java.lang.ExceptionInInitializeError时出错；斯卡拉 Mac OSX 10.11.6 Scala版本2.11.8 aws java sdk 1.11.57 播放框架2.5.10

我是Scala和Play框架的新手

我有一个将被注入控制器的类

class BoardRepositoryImpl extends BoardRepository {

  private val tableName = "tyo_boards"

  private val table = DynamoDBProvider.db.getTable(tableName)

  override def findAll: List[Board] = {

    val hashCondition = new Condition()
      .withComparisonOperator(ComparisonOperator.EQ)
      .withAttributeValueList(new AttributeValue("841120161129"))

    table.scan(new ScanSpec())
      .asScala
      .toList
      .map( i => new Board(
        i.getString(BoardRepository.codeDate),
        i.getList(BoardRepository.withLimit)
          .asScala
          .toList,
        i.getString(BoardRepository.time)
      )
    )
  }

}

object BoardRepository {
  val codeDate = "code_date"
  val withLimit = "with_limit"
  val time = "time"
}

控制器是

@Singleton
class BoardsController @Inject()(repository: BoardRepositoryImpl) extends Controller {

  def index = Action {
    val boards = repository.findAll

    Ok(views.html.boards(boards))
  }

}

com.google.inject.ProvisionException: Unable to provision, see the following errors:

1) Error injecting constructor, java.lang.ExceptionInInitializerError
  at infrastructure.BoardRepositoryImpl.<init>(BoardRepositoryImpl.scala:18)
  while locating infrastructure.BoardRepositoryImpl
    for parameter 0 at controllers.BoardsController.<init>(BoardsController.scala:13)
  at controllers.BoardsController.class(BoardsController.scala:13)
  while locating controllers.BoardsController
    for parameter 2 at router.Routes.<init>(Routes.scala:43)
  while locating router.Routes
  while locating play.api.inject.RoutesProvider
  while locating play.api.routing.Router
    for parameter 0 at play.api.http.JavaCompatibleHttpRequestHandler.<init>(HttpRequestHandler.scala:200)
  while locating play.api.http.JavaCompatibleHttpRequestHandler
  while locating play.api.http.HttpRequestHandler
    for parameter 4 at play.api.DefaultApplication.<init>(Application.scala:221)
  at play.api.DefaultApplication.class(Application.scala:221)
  while locating play.api.DefaultApplication
  while locating play.api.Application

1 error
     com.google.inject.internal.InjectorImpl$2.get(InjectorImpl.java:1025)
     com.google.inject.internal.InjectorImpl.getInstance(InjectorImpl.java:1051)
     play.api.inject.guice.GuiceInjector.instanceOf(GuiceInjectorBuilder.scala:405)
     play.api.inject.guice.GuiceInjector.instanceOf(GuiceInjectorBuilder.scala:400)
     play.api.inject.guice.GuiceApplicationBuilder.build(GuiceApplicationBuilder.scala:123)
     play.api.inject.guice.GuiceApplicationLoader.load(GuiceApplicationLoader.scala:21)
     play.core.server.DevServerStart$$anonfun$mainDev$1$$anon$1$$anonfun$get$1$$anonfun$apply$1$$anonfun$1$$anonfun$2.apply(DevServerStart.scala:168)
     play.core.server.DevServerStart$$anonfun$mainDev$1$$anon$1$$anonfun$get$1$$anonfun$apply$1$$anonfun$1$$anonfun$2.apply(DevServerStart.scala:164)
     play.utils.Threads$.withContextClassLoader(Threads.scala:21)
     play.core.server.DevServerStart$$anonfun$mainDev$1$$anon$1$$anonfun$get$1$$anonfun$apply$1$$anonfun$1.apply(DevServerStart.scala:164)
     play.core.server.DevServerStart$$anonfun$mainDev$1$$anon$1$$anonfun$get$1$$anonfun$apply$1$$anonfun$1.apply(DevServerStart.scala:131)
     scala.Option.map(Option.scala:146)
     play.core.server.DevServerStart$$anonfun$mainDev$1$$anon$1$$anonfun$get$1$$anonfun$apply$1.apply(DevServerStart.scala:131)
     play.core.server.DevServerStart$$anonfun$mainDev$1$$anon$1$$anonfun$get$1$$anonfun$apply$1.apply(DevServerStart.scala:129)
     scala.util.Success.flatMap(Try.scala:231)
     play.core.server.DevServerStart$$anonfun$mainDev$1$$anon$1$$anonfun$get$1.apply(DevServerStart.scala:129)
     play.core.server.DevServerStart$$anonfun$mainDev$1$$anon$1$$anonfun$get$1.apply(DevServerStart.scala:121)
     scala.concurrent.impl.Future$PromiseCompletingRunnable.liftedTree1$1(Future.scala:24)
     scala.concurrent.impl.Future$PromiseCompletingRunnable.run(Future.scala:24)
     java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1402)
     java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
     java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)
     java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692)
     java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)

结果是

@Singleton
class BoardsController @Inject()(repository: BoardRepositoryImpl) extends Controller {

  def index = Action {
    val boards = repository.findAll

    Ok(views.html.boards(boards))
  }

}

com.google.inject.ProvisionException: Unable to provision, see the following errors:

1) Error injecting constructor, java.lang.ExceptionInInitializerError
  at infrastructure.BoardRepositoryImpl.<init>(BoardRepositoryImpl.scala:18)
  while locating infrastructure.BoardRepositoryImpl
    for parameter 0 at controllers.BoardsController.<init>(BoardsController.scala:13)
  at controllers.BoardsController.class(BoardsController.scala:13)
  while locating controllers.BoardsController
    for parameter 2 at router.Routes.<init>(Routes.scala:43)
  while locating router.Routes
  while locating play.api.inject.RoutesProvider
  while locating play.api.routing.Router
    for parameter 0 at play.api.http.JavaCompatibleHttpRequestHandler.<init>(HttpRequestHandler.scala:200)
  while locating play.api.http.JavaCompatibleHttpRequestHandler
  while locating play.api.http.HttpRequestHandler
    for parameter 4 at play.api.DefaultApplication.<init>(Application.scala:221)
  at play.api.DefaultApplication.class(Application.scala:221)
  while locating play.api.DefaultApplication
  while locating play.api.Application

1 error
     com.google.inject.internal.InjectorImpl$2.get(InjectorImpl.java:1025)
     com.google.inject.internal.InjectorImpl.getInstance(InjectorImpl.java:1051)
     play.api.inject.guice.GuiceInjector.instanceOf(GuiceInjectorBuilder.scala:405)
     play.api.inject.guice.GuiceInjector.instanceOf(GuiceInjectorBuilder.scala:400)
     play.api.inject.guice.GuiceApplicationBuilder.build(GuiceApplicationBuilder.scala:123)
     play.api.inject.guice.GuiceApplicationLoader.load(GuiceApplicationLoader.scala:21)
     play.core.server.DevServerStart$$anonfun$mainDev$1$$anon$1$$anonfun$get$1$$anonfun$apply$1$$anonfun$1$$anonfun$2.apply(DevServerStart.scala:168)
     play.core.server.DevServerStart$$anonfun$mainDev$1$$anon$1$$anonfun$get$1$$anonfun$apply$1$$anonfun$1$$anonfun$2.apply(DevServerStart.scala:164)
     play.utils.Threads$.withContextClassLoader(Threads.scala:21)
     play.core.server.DevServerStart$$anonfun$mainDev$1$$anon$1$$anonfun$get$1$$anonfun$apply$1$$anonfun$1.apply(DevServerStart.scala:164)
     play.core.server.DevServerStart$$anonfun$mainDev$1$$anon$1$$anonfun$get$1$$anonfun$apply$1$$anonfun$1.apply(DevServerStart.scala:131)
     scala.Option.map(Option.scala:146)
     play.core.server.DevServerStart$$anonfun$mainDev$1$$anon$1$$anonfun$get$1$$anonfun$apply$1.apply(DevServerStart.scala:131)
     play.core.server.DevServerStart$$anonfun$mainDev$1$$anon$1$$anonfun$get$1$$anonfun$apply$1.apply(DevServerStart.scala:129)
     scala.util.Success.flatMap(Try.scala:231)
     play.core.server.DevServerStart$$anonfun$mainDev$1$$anon$1$$anonfun$get$1.apply(DevServerStart.scala:129)
     play.core.server.DevServerStart$$anonfun$mainDev$1$$anon$1$$anonfun$get$1.apply(DevServerStart.scala:121)
     scala.concurrent.impl.Future$PromiseCompletingRunnable.liftedTree1$1(Future.scala:24)
     scala.concurrent.impl.Future$PromiseCompletingRunnable.run(Future.scala:24)
     java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1402)
     java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
     java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)
     java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692)
     java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)

com.google.inject.ProvisionException:无法设置，请查看以下错误：
1） 注入构造函数java.lang.ExceptionInInitializeError时出错
位于infrastructure.BoardRepositoryImpl.（BoardRepositoryImpl.scala:18）
查找infrastructure.BoardRepositoryImpl时
用于controllers.BoardsController处的参数0。（BoardsController.scala:13）
at controllers.BoardsController.class（BoardsController.scala:13）
查找控制器时。BoardsController
用于router.Routes处的参数2。（Routes.scala:43）
定位路由器时。路由
查找play.api.inject.routeProvider时
查找play.api.routing.Router时
用于play.api.http.JavaCompatibleHttpRequestHandler处的参数0。（HttpRequestHandler.scala:200）
查找play.api.http.JavaCompatibleHttpRequestHandler时
查找play.api.http.HttpRequestHandler时
用于play.api.DefaultApplication中的参数4。（Application.scala:221）
at play.api.DefaultApplication.class（Application.scala:221）
查找play.api.DefaultApplication时
查找play.api.Application时
1错误
com.google.inject.internal.InjectorImpl$2.get（InjectorImpl.java:1025）
com.google.inject.internal.InjectorImpl.getInstance（InjectorImpl.java:1051）
play.api.inject.guice.GuiceInjector.instanceOf（guiceinjectbuilder.scala:405）
play.api.inject.guice.GuiceInjector.instanceOf（guiceinjectbuilder.scala:400）
play.api.inject.guice.GuiceApplicationBuilder.build（GuiceApplicationBuilder.scala:123）
play.api.inject.guice.GuiceApplicationLoader.load（GuiceApplicationLoader.scala:21）
play.core.server.DevServerStart$$anonfun$mainDev$1$$anon$1$$anonfun$get$1$$anonfun$apply$1$$anonfun$1$$anonfun$2.apply（DevServerStart.scala:168）
play.core.server.DevServerStart$$anonfun$mainDev$1$$anon$1$$anonfun$get$1$$anonfun$apply$1$$anonfun$1$$anonfun$2.apply（DevServerStart.scala:164）
play.utils.Threads$.withContextClassLoader（Threads.scala:21）
play.core.server.DevServerStart$$anonfun$mainDev$1$$anon$1$$anonfun$get$1$$anonfun$apply$1$$anonfun$1.apply（DevServerStart.scala:164）
play.core.server.DevServerStart$$anonfun$mainDev$1$$anon$1$$anonfun$get$1$$anonfun$apply$1$$anonfun$1.apply（DevServerStart.scala:131）
scala.Option.map（Option.scala:146）
play.core.server.DevServerStart$$anonfun$mainDev$1$$anon$1$$anonfun$get$1$$anonfun$apply$1.apply（DevServerStart.scala:131）
play.core.server.DevServerStart$$anonfun$mainDev$1$$anon$1$$anonfun$get$1$$anonfun$apply$1.apply（DevServerStart.scala:129）
scala.util.Success.flatMap（Try.scala:231）
play.core.server.DevServerStart$$anonfun$mainDev$1$$anon$1$$anonfun$get$1.apply（DevServerStart.scala:129）
play.core.server.DevServerStart$$anonfun$mainDev$1$$anon$1$$anonfun$get$1.apply（DevServerStart.scala:121）
scala.concurrent.impl.Future$PromiseCompletingRunnable.liftedTree1$1（Future.scala:24）
scala.concurrent.impl.Future$PromiseCompletingRunnable.run（Future.scala:24）
java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec（ForkJoinTask.java:1402）
java.util.concurrent.ForkJoinTask.doExec（ForkJoinTask.java:289）
java.util.concurrent.ForkJoinPool$WorkQueue.runTask（ForkJoinPool.java:1056）
java.util.concurrent.ForkJoinPool.runWorker（ForkJoinPool.java:1692）
java.util.concurrent.ForkJoinWorkerThread.run（ForkJoinWorkerThread.java:157）

---

老实说，我不知道为什么会发生这种情况。

我的猜测是尽量避免初始化构造函数中的值

表。尝试将其声明为lazy val，或者在方法
findAll
中执行。它成功了！谢谢。但我需要了解原因。原因可能是在您访问
DynamoDBProvider
时，它还不是真的（可能取决于首先需要引导的其他东西），因此在guice尝试实例化您的存储库时引发了异常。感谢您的回答，虽然我还不明白。也许我需要检查一下实例化的时间安排。