Play Framework For Scala:编译错误[类型应用程序不是包控制器的成员] [英] Play Framework For Scala: Compilation error[type Application is not a member of package controllers]

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问题描述

我尝试在书中编译一个 Scala 示例:Play for Scala"，但在 Play 控制台上出现以下编译错误:

I try to compile a scala example in the book: "Play for Scala" but get a following compilation error on Play console:

C:Playexpch6_implicits>activator run
[info] Loading project definition from C:Playexpch6_implicitsproject
[info] Set current project to ch6_implicits (in build file:/C:/Play/exp/ch6_implicits/)

--- (Running the application, auto-reloading is enabled) ---

[info] p.a.l.c.ActorSystemProvider - Starting application default Akka system: application
[info] p.c.s.NettyServer$ - Listening for HTTP on /0:0:0:0:0:0:0:0:9000

(Server started, use Ctrl+D to stop and go back to the console...)

[info] Compiling 13 Scala sources and 1 Java source to C:Playexpch6_implicits	argetscala-2.11classes...
[error] C:Playexpch6_implicitsconf
outes:6: type Application is not a member of package controllers
[error] GET             /                               controllers.Application.index
[error] C:Playexpch6_implicitsconf
outes:7: type Shop is not a member of package controllers
[error] GET             /catalog                controllers.Shop.catalog
[error] C:Playexpch6_implicitsconf
outes:6: type Application is not a member of package controllers
[error] GET             /                               controllers.Application.index
[error] C:Playexpch6_implicitsconf
outes:7: type Shop is not a member of package controllers
[error] GET             /catalog                controllers.Shop.catalog
[error] C:Playexpch6_implicitsconf
outes:6: type Application is not a member of package controllers
[error] GET             /                               controllers.Application.index
[error] C:Playexpch6_implicitsconf
outes:7: type Shop is not a member of package controllers
[error] GET             /catalog                controllers.Shop.catalog
[error] 6 errors found
[error] (compile:compileIncremental) Compilation failed
[error] application -

! @6mafk6inc - Internal server error, for (GET) [/products/new] ->

play.sbt.PlayExceptions$CompilationException: Compilation error[type Application is not a member of package controllers]
        at play.sbt.PlayExceptions$CompilationException$.apply(PlayExceptions.scala:27) ~[na:na]
        at play.sbt.PlayExceptions$CompilationException$.apply(PlayExceptions.scala:27) ~[na:na]
        at scala.Option.map(Option.scala:145) ~[scala-library-2.11.6.jar:na]
        at play.sbt.run.PlayReload$$anonfun$taskFailureHandler$1.apply(PlayReload.scala:49) ~[na:na]
        at play.sbt.run.PlayReload$$anonfun$taskFailureHandler$1.apply(PlayReload.scala:44) ~[na:na]
        at scala.Option.map(Option.scala:145) ~[scala-library-2.11.6.jar:na]
        at play.sbt.run.PlayReload$.taskFailureHandler(PlayReload.scala:44) ~[na:na]
        at play.sbt.run.PlayReload$.compileFailure(PlayReload.scala:40) ~[na:na]
        at play.sbt.run.PlayReload$$anonfun$compile$1.apply(PlayReload.scala:17) ~[na:na]
        at play.sbt.run.PlayReload$$anonfun$compile$1.apply(PlayReload.scala:17) ~[na:na]

Application.scala 是:

Application.scala is:

package controllers

import play.api._
import play.api.mvc._

// We extend the 'WithCart' trait, so we have an implicit conversion from RequestHeader to Cart
object Application extends Controller with WithCart {

  def index = Action { implicit request =>
    // The index template takes an implicit Cart, which is not available.
    // However, the WithCart trait has an implicit conversion from
    // RequestHeader to Cart, and we do have an implicit RequestHeader
    // here, because `request` is a Request, which extends RequestHeader.
    Ok(views.html.index())
  }

  def contact = Action { implicit request =>
    Ok(views.html.contact())
  }

}

Shop.scala 是

Shop.scala is

package controllers

import play.api._
import play.api.mvc._
import models._

object Shop extends Controller with WithCart {

  def catalog() = Action { implicit request =>
    val products = ProductDAO.list
    Ok(views.html.products.catalog(products))
  }

}

路由文件是:

# Routes
# This file defines all application routes (Higher priority routes first)
# ~~~~

# Home page
GET     /               controllers.Application.index
GET     /catalog        controllers.Shop.catalog
GET     /contact        controllers.Application.contact

# Map static resources from the /public folder to the /assets URL path
GET     /assets/*file               controllers.Assets.at(path="/public", file)

Play Framework 是 2.4.0 并且说:

Play Framework is 2.4.0 and about says:

[ch6_implicits] $ about
[info] This is sbt 0.13.8
[info] The current project is {file:/C:/Play/exp/ch6_implicits/}root 1.0-SNAPSHOT
[info] The current project is built against Scala 2.11.6
[info] Available Plugins: sbt.plugins.IvyPlugin, sbt.plugins.JvmPlugin, sbt.plugins.CorePlugin, sbt.plugins.JUnitXmlReportPlugin, play.sbt.Play, play.sbt.PlayAkkaHttpServer, play.sbt.PlayJava, play.sb
t.PlayLayoutPlugin, play.sbt.PlayNettyServer, play.sbt.PlayScala, play.sbt.routes.RoutesCompiler, play.twirl.sbt.SbtTwirl, com.typesafe.sbt.SbtNativePackager, com.typesafe.sbt.packager.archetypes.Akka
AppPackaging, com.typesafe.sbt.packager.archetypes.JavaAppPackaging, com.typesafe.sbt.packager.archetypes.JavaServerAppPackaging, com.typesafe.sbt.packager.archetypes.jar.ClasspathJarPlugin, com.types
afe.sbt.packager.archetypes.jar.LauncherJarPlugin, com.typesafe.sbt.packager.debian.DebianDeployPlugin, com.typesafe.sbt.packager.debian.DebianPlugin, com.typesafe.sbt.packager.debian.JDebPackaging, c
om.typesafe.sbt.packager.docker.DockerPlugin, com.typesafe.sbt.packager.jdkpackager.JDKPackagerDeployPlugin, com.typesafe.sbt.packager.jdkpackager.JDKPackagerPlugin, com.typesafe.sbt.packager.linux.Li
nuxPlugin, com.typesafe.sbt.packager.rpm.RpmDeployPlugin, com.typesafe.sbt.packager.rpm.RpmPlugin, com.typesafe.sbt.packager.universal.UniversalDeployPlugin, com.typesafe.sbt.packager.universal.Univer
salPlugin, com.typesafe.sbt.packager.windows.WindowsDeployPlugin, com.typesafe.sbt.packager.windows.WindowsPlugin, com.typesafe.sbt.web.SbtWeb, com.typesafe.sbt.jse.SbtJsEngine, com.typesafe.sbt.jse.S
btJsTask, com.typesafe.sbt.coffeescript.SbtCoffeeScript, com.typesafe.sbt.less.SbtLess, com.typesafe.sbt.jshint.SbtJSHint, com.typesafe.sbt.rjs.SbtRjs, com.typesafe.sbt.digest.SbtDigest, com.typesafe.
sbt.mocha.SbtMocha, com.typesafe.sbteclipse.plugin.EclipsePlugin
[info] sbt, sbt plugins, and build definitions are using Scala 2.10.4
[ch6_implicits] $

Java 版本是:

C:Playexpch6_implicits>java -version
java version "1.8.0_45"
Java(TM) SE Runtime Environment (build 1.8.0_45-b15)
Java HotSpot(TM) 64-Bit Server VM (build 25.45-b02, mixed mode)

C:Playexpch6_implicits>javac -version
javac 1.8.0_45

任何想法是什么问题以及如何解决这个问题?

Any ideas what's the problem and how to fix this?

到目前为止，其他示例已在我的环境中编译和运行而没有错误.

So far other examples have compiled and run without error in my environment.

感谢您的支持！

推荐答案

Play 2.4 在默认情况下会生成依赖项注入的路由器，这与以前使用静态路由器不同.您有两个选择，从 build.sbt 中删除 routesGenerator 行，这样 play 将生成一个静态路由器，或者(更好)让您的控制器类而不是对象，并使用依赖注入.

Play 2.4, by default, generates a dependency injected router, unlike previously, when it used a static router. You have two options, remove the routesGenerator line from build.sbt so play will generate a static router, or (better) make your controllers classes instead of objects, and use dependency injection.

这篇关于Play Framework For Scala:编译错误[类型应用程序不是包控制器的成员]的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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