Question

我使用Gitter Play Scala Seed模板创建了一个初学者项目。之后我决定按照these和these指示，将我的另一个项目作为子项目添加到此项目中。但是，即使我添加了子项目文件夹并从我的build.sbt文件中引用它，每当我运行update（或其任何依赖项）时，我都会收到错误消息，说明子项目无法找到。

这是我在play项目（我的基础项目）文件夹中使用的build.sbt：

name := """play-scala-starter-example"""

version := "1.0-SNAPSHOT"

lazy val root = (project in file("."))
    .enablePlugins(PlayScala)
    .aggregate(lettergenerator)
    .dependsOn(lettergenerator)

// I have also tried it explicitly:
// lazy val lettergenerator = (project in file("lettergenerator"))
lazy val lettergenerator = project

resolvers += Resolver.sonatypeRepo("snapshots")

scalaVersion := "2.12.2"

libraryDependencies += guice
libraryDependencies += "org.scalatestplus.play" %% "scalatestplus-play" % "3.0.0" % Test
libraryDependencies += "com.h2database" % "h2" % "1.4.194"

这是我的文件夹结构：

play-scala-starter-example
 ├ app
 ├ build.sbt
 ├ conf
 ├ lettergenerator
 │  ├ build.sbt
 │  ├ LICENSE
 │  ├ project
 │  ├ README.md
 │  ├ src
 │  └ TODO.md
 ├ LICENSE
 ├ logs
 ├ project
 ├ public
 ├ README.md
 ├ target
 └ test

以下是错误的堆栈跟踪：

[info] Loading global plugins from /home/claudiusbr/.sbt/0.13/plugins
[info] Loading project definition from /home/claudiusbr/test/play-scala-starter-example/project
java.lang.RuntimeException: No project 'lettergenerator' in 'file:/home/claudiusbr/test/play-scala-starter-example/'.
Valid project IDs: root
        at scala.sys.package$.error(package.scala:27)
        at sbt.Load$$anonfun$checkAll$2$$anonfun$apply$16.apply(Load.scala:401)
        at sbt.Load$$anonfun$checkAll$2$$anonfun$apply$16.apply(Load.scala:396)
        at scala.collection.immutable.List.foreach(List.scala:318)
        at sbt.Load$$anonfun$checkAll$2.apply(Load.scala:396)
        at sbt.Load$$anonfun$checkAll$2.apply(Load.scala:396)
        at scala.collection.TraversableLike$WithFilter$$anonfun$foreach$1.apply(TraversableLike.scala:772)
        at scala.collection.immutable.Map$Map1.foreach(Map.scala:109)
        at scala.collection.TraversableLike$WithFilter.foreach(TraversableLike.scala:771)
        at sbt.Load$.checkAll(Load.scala:396)
        at sbt.Load$.loadURI(Load.scala:321)
        at sbt.Load$.load(Load.scala:316)
        at sbt.Load$.load(Load.scala:305)
        at sbt.Load$$anonfun$4.apply(Load.scala:146)
        at sbt.Load$$anonfun$4.apply(Load.scala:146)
        at sbt.Load$.timed(Load.scala:1025)
        at sbt.Load$.apply(Load.scala:146)
        at sbt.Load$.defaultLoad(Load.scala:39)
        at sbt.BuiltinCommands$.liftedTree1$1(Main.scala:548)
        at sbt.BuiltinCommands$.doLoadProject(Main.scala:548)
        at sbt.BuiltinCommands$$anonfun$loadProjectImpl$2.apply(Main.scala:540)
        at sbt.BuiltinCommands$$anonfun$loadProjectImpl$2.apply(Main.scala:540)
        at sbt.Command$$anonfun$applyEffect$1$$anonfun$apply$2.apply(Command.scala:59)
        at sbt.Command$$anonfun$applyEffect$1$$anonfun$apply$2.apply(Command.scala:59)
        at sbt.Command$$anonfun$applyEffect$2$$anonfun$apply$3.apply(Command.scala:61)
        at sbt.Command$$anonfun$applyEffect$2$$anonfun$apply$3.apply(Command.scala:61)
        at sbt.Command$.process(Command.scala:93)
        at sbt.MainLoop$$anonfun$1$$anonfun$apply$1.apply(MainLoop.scala:96)
        at sbt.MainLoop$$anonfun$1$$anonfun$apply$1.apply(MainLoop.scala:96)
        at sbt.State$$anon$1.doX$1(State.scala:183)
        at sbt.State$$anon$1.process(State.scala:190)
        at sbt.MainLoop$$anonfun$1.apply(MainLoop.scala:96)
        at sbt.MainLoop$$anonfun$1.apply(MainLoop.scala:96)
        at sbt.ErrorHandling$.wideConvert(ErrorHandling.scala:17)
        at sbt.MainLoop$.next(MainLoop.scala:96)
        at sbt.MainLoop$.run(MainLoop.scala:89)
        at sbt.MainLoop$$anonfun$runWithNewLog$1.apply(MainLoop.scala:68)
        at sbt.MainLoop$$anonfun$runWithNewLog$1.apply(MainLoop.scala:63)
        at sbt.Using.apply(Using.scala:24)
        at sbt.MainLoop$.runWithNewLog(MainLoop.scala:63)
        at sbt.MainLoop$.runAndClearLast(MainLoop.scala:46)
        at sbt.MainLoop$.runLoggedLoop(MainLoop.scala:30)
        at sbt.MainLoop$.runLogged(MainLoop.scala:22)
        at sbt.StandardMain$.runManaged(Main.scala:109)
        at sbt.xMain.run(Main.scala:38)
        at xsbt.boot.Launch$$anonfun$run$1.apply(Launch.scala:109)
        at xsbt.boot.Launch$.withContextLoader(Launch.scala:128)
        at xsbt.boot.Launch$.run(Launch.scala:109)
        at xsbt.boot.Launch$$anonfun$apply$1.apply(Launch.scala:35)
        at xsbt.boot.Launch$.launch(Launch.scala:117)
        at xsbt.boot.Launch$.apply(Launch.scala:18)
        at xsbt.boot.Boot$.runImpl(Boot.scala:41)
        at xsbt.boot.Boot$.main(Boot.scala:17)
        at xsbt.boot.Boot.main(Boot.scala)
[error] No project 'lettergenerator' in 'file:/home/claudiusbr/test/play-scala-starter-example/'.
[error] Valid project IDs: root
[error] Use 'last' for the full log.
Project loading failed: (r)etry, (q)uit, (l)ast, or (i)gnore? q

我试过看what seems to be a similar question for a different error，但我看不到任何东西似乎对我的问题有帮助。

我正在为sbt使用0.13.16版本Scala 2.12.3和lettergenerator，但我分别尝试了这两个版本和0.13.15 / 2.12.2我的play项目的build.sbt并没有效果。

我可能会遗漏一些显而易见的东西，但到目前为止，我不确定我还能做些什么，所以我将不胜感激。

Answer 1

我认为您需要将lettergenerator指向项目的正确子目录，即替换

lazy val lettergenerator = project

与

lazy val lettergenerator = project.in(file("lettergenerator"))

对于多个子项目，我建议从默认播放布局切换到default SBT layout，并将播放应用程序移动到单独的子目录中，即backend或{{1}或者其他什么。

我还建议不要为不同的子项目提供多个server文件。根据我的经验，这不能很好地扩展，并且随着子项目变得更加复杂，很快就会变得混乱。

相反，我建议保留一个顶级build.sbt，并在build.sbt中定义每个项目的所有设置。对于影响整个项目的常见设置，例如.settings，我在version项目simple example或more complex real world example上使用.settings(inThisBuild(…))。

在Play 2.6.3项目的根文件夹中找不到非Play Sbt Scala子项目

1 个答案: