ProvisionException：无法提供，正在运行的框架

Question

我收到这些错误 ProvisionException: 无法配置，查看以下错误：

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

1) Could not find a suitable constructor in models.factory.FactoryHandler. Classes must have either one (and only one) constructor annotated with @Inject or a zero-argument constructor that is not private.
  at models.factory.FactoryHandler.class(FactoryHandler.scala:7)
  while locating models.factory.FactoryHandler
    for parameter 0 at controllers.DirectUserController.<init>(DirectUserController.scala:90)
  while locating controllers.DirectUserController
    for parameter 7 at router.Routes.<init>(Routes.scala:124)
  while locating router.Routes
  while locating play.api.inject.RoutesProvider
  while locating play.api.routing.Router

1 error
     com.google.inject.internal.InjectorImpl$2.get(InjectorImpl.java:1025)
     com.google.inject.internal.InjectorImpl.getInstance(InjectorImpl.java:1051)
     play.api.inject.guice.GuiceInjector.instanceOf(GuiceInjectorBuilder.scala:321)
     play.api.inject.guice.GuiceInjector.instanceOf(GuiceInjectorBuilder.scala:316)
     play.api.Application$class.routes(Application.scala:111)
     play.api.DefaultApplication.routes(Application.scala:240)
     play.api.Play$$anonfun$start$1.apply$mcV$sp(Play.scala:90)
     play.api.Play$$anonfun$start$1.apply(Play.scala:87)
     play.api.Play$$anonfun$start$1.apply(Play.scala:87)
     play.utils.Threads$.withContextClassLoader(Threads.scala:21)
     play.api.Play$.start(Play.scala:87)

这里是代码

class FactoryHandler(var s:String="real") {
  val log = LoggerFactory.getLogger(this.getClass)
  log.debug("choice {}",s)
}

这是 DirectUserController 的第 90 行

    class DirectUserController @Inject() (var factory:FactoryHandler) extends Controller {
//other Action code 
}

我还在路由文件中添加了代码

routesGenerator := InjectedRoutesGenerator

我正在使用 play framework 2.4 请帮助我为什么会出现此错误

Answer 1

你需要在 FactoryHandler 代码中指定一个 @Inject() 。阅读错误，我认为它说明了它有什么问题。