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我在我的 SBT 构建中添加了这些 Scalac 选项：

scalacOptions ++= Seq("-unchecked", "-deprecation","-feature"),

但后来我无法再访问我的 Play 2.1 Web 应用程序了。

这是我构建的唯一修改部分，如果我删除它，它会再次正常工作。

这很奇怪，因为应用程序似乎正在运行（我看到启动日志、计划的作业......），但尝试从浏览器访问它会给我播放错误页面：

Cannot init the Global object
No source available, here is the exception stack trace:
->java.lang.ExceptionInInitializerError: 
     Global$.<init>(Global.scala:17)
     Global$.<clinit>(Global.scala)
     sun.misc.Unsafe.ensureClassInitialized(Native Method)
     sun.reflect.UnsafeFieldAccessorFactory.newFieldAccessor(UnsafeFieldAccessorFactory.java:43)
     sun.reflect.ReflectionFactory.newFieldAccessor(ReflectionFactory.java:140)
     java.lang.reflect.Field.acquireFieldAccessor(Field.java:949)
     java.lang.reflect.Field.getFieldAccessor(Field.java:930)
     java.lang.reflect.Field.get(Field.java:372)
     play.api.WithDefaultGlobal$class.play$api$WithDefaultGlobal$$scalaGlobal(Application.scala:37)
     play.api.DefaultApplication.play$api$WithDefaultGlobal$$scalaGlobal$lzycompute(Application.scala:383)
     play.api.DefaultApplication.play$api$WithDefaultGlobal$$scalaGlobal(Application.scala:383)
     play.api.WithDefaultGlobal$$anonfun$play$api$WithDefaultGlobal$$globalInstance$1$$anonfun$apply$5.apply(Application.scala:52)
     play.api.WithDefaultGlobal$$anonfun$play$api$WithDefaultGlobal$$globalInstance$1$$anonfun$apply$5.apply(Application.scala:52)
     scala.Option.getOrElse(Option.scala:120)
     play.api.WithDefaultGlobal$$anonfun$play$api$WithDefaultGlobal$$globalInstance$1.apply(Application.scala:52)
     play.api.WithDefaultGlobal$$anonfun$play$api$WithDefaultGlobal$$globalInstance$1.apply(Application.scala:51)
     play.utils.Threads$.withContextClassLoader(Threads.scala:18)
     play.api.WithDefaultGlobal$class.play$api$WithDefaultGlobal$$globalInstance(Application.scala:50)
     play.api.DefaultApplication.play$api$WithDefaultGlobal$$globalInstance$lzycompute(Application.scala:383)
     play.api.DefaultApplication.play$api$WithDefaultGlobal$$globalInstance(Application.scala:383)
     play.api.WithDefaultGlobal$class.global(Application.scala:66)
     play.api.DefaultApplication.global(Application.scala:383)
     play.api.WithDefaultConfiguration$class.play$api$WithDefaultConfiguration$$fullConfiguration(Application.scala:80)
     play.api.DefaultApplication.play$api$WithDefaultConfiguration$$fullConfiguration$lzycompute(Application.scala:383)
     play.api.DefaultApplication.play$api$WithDefaultConfiguration$$fullConfiguration(Application.scala:383)
     play.api.WithDefaultConfiguration$class.configuration(Application.scala:82)
     play.api.DefaultApplication.configuration(Application.scala:383)
     play.api.Application$class.$init$(Application.scala:268)
     play.api.DefaultApplication.<init>(Application.scala:383)
     play.core.ReloadableApplication$$anonfun$get$1$$anonfun$apply$1$$anonfun$1$$anon$1.<init>(ApplicationProvider.scala:128)
     play.core.ReloadableApplication$$anonfun$get$1$$anonfun$apply$1$$anonfun$1.apply(ApplicationProvider.scala:128)
     play.core.ReloadableApplication$$anonfun$get$1$$anonfun$apply$1$$anonfun$1.apply(ApplicationProvider.scala:114)
     scala.Option.map(Option.scala:145)
     play.core.ReloadableApplication$$anonfun$get$1$$anonfun$apply$1.apply(ApplicationProvider.scala:114)
     play.core.ReloadableApplication$$anonfun$get$1$$anonfun$apply$1.apply(ApplicationProvider.scala:112)
     scala.util.Either$RightProjection.flatMap(Either.scala:523)
     play.core.ReloadableApplication$$anonfun$get$1.apply(ApplicationProvider.scala:112)
     play.core.ReloadableApplication$$anonfun$get$1.apply(ApplicationProvider.scala:104)
     scala.concurrent.impl.Future$PromiseCompletingRunnable.liftedTree1$1(Future.scala:24)
     scala.concurrent.impl.Future$PromiseCompletingRunnable.run(Future.scala:24)
     java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
     java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
     java.lang.Thread.run(Thread.java:722)

我的 Global.scala 看起来像这样：

object Global extends GlobalSettings {

  // TODO use cake pattern injection?
  val searchService: SearchService = StampleApplication.get.searchService
  val breadcrumbService: BreadcrumbService = StampleApplication.get.breadcrumbService

  override def onStart(app: Application) {
    Logger.info("Application has started")
    startElasticSearchIndexationScheduling
    startBreadcrumbUpdaterJob
  }

  override def onStop(app: Application) {
    Logger.info("Application shutdown...")
  }



  // TODO externaliser delais des jobs dans la conf play?

  def startElasticSearchIndexationScheduling = {
    Akka.system.scheduler.schedule(30 seconds , 30 seconds) {
      Logger.info("Indexation job triggered")
      searchService.indexUnindexedStamples
      searchService.indexUnindexedUsers
    }
  }

  def startBreadcrumbUpdaterJob = {
    Akka.system.scheduler.schedule(30 seconds, 30 seconds) {
      Logger.info("Breadcrumb updated job triggered")
      breadcrumbService.updateChildsBreadcrumbForFlaggedCategories
      Logger.info("Breadcrumb updated (with recursion!) job triggered")
      breadcrumbService.recompteAllFlaggedWithRecursion
    }
  }



}

Global$.(Global.scala:17) 似乎引用了这一行：

val searchService: SearchService = StampleApplication.get.searchService

其余的来源是：

object StampleApplication {

  val get: CakeApplication = {
    println("Building stample cake application")
    // Inject properties here
    new CakeConfiguration().buildApplication
  }

}

trait CakeApplication
  extends ServiceLayer
  with RepositoryLayer


trait ServiceLayer
  extends RepositoryLayer
  with DefaultUserServiceComponent
  with DefaultCategoryServiceComponent
  with DefaultStampleServiceComponent
  with DefaultAclServiceComponent
  with DefaultFileServiceComponent
  with DefaultApiCallServiceComponent
  with DefaultBreadcrumbServiceComponent
  with DefaultSearchServiceComponent
  with DefaultRelationshipServiceComponent
  with DefaultSharingServiceComponent
  with DefaultAuthCodeServiceComponent
  with DefaultNotificationServiceComponent
  with DefaultEventServiceComponent
  with DefaultCommentServiceComponent


trait RepositoryLayer
  extends MongoUserRepositoryComponent
  with MongoCategoryRepositoryComponent
  with MongoCategorySharingRepositoryComponent
  with MongoStampleRepositoryComponent
  with MongoFileRepositoryComponent
  with MongoApiCallRepositoryComponent
  with MongoRelationshipRepositoryComponent
  with MongoSharingRepositoryComponent
  with MongoNotificationRepositoryComponent

  with SalatDAOFactoryComponent
  with CollectionProviderComponent

trait CollectionProviderComponent {
  def collectionProvider:MongoCollectionProvider
}
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