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我正在编译一个多部分的 Scala 项目。它不是那么大，但其中一些是 Scala 2.13，一些是 Scala 3。

尝试编译会产生致命错误 [UNRESOLVED DEPENDENCIES: base#base_2.12;0.1.0-SNAPSHOT: not found]

问题是，字符串 {0.1.0-SNAPSHOT} 不会出现在我的 build.sbt 或其他任何地方的任何地方。它曾经在那里，但它早已不复存在。我假设一些更新缓存包含它，但我一直无法找到它。

这是我的 {build.sbt}：

ThisBuild / libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.7" % Test
ThisBuild / Compile / scalacOptions ++= Seq("--deprecation")

ThisBuild / Test / logBuffered := false
ThisBuild / Test / parallelExecution := false

lazy val scala213 = "2.13.5"
lazy val scala212 = "2.12.13"
lazy val scala3 = "3.0.0-RC2"
lazy val supportedScalaVersions = List(scala213, scala3)

lazy val root = (project in file("."))
  .aggregate(top, trans, base)
  .settings(
    name := "toysat"
  )

lazy val top = (project in file("top"))
  .settings(
    name := "main",
    scalaVersion := scala213,
    scalacOptions += "-Ytasty-reader",
    libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.7" % Test
  )
  .dependsOn(trans, base)

lazy val trans = (project in file("trans"))
   .settings(
     name := "trans",
     Compile / scalaVersion := scala3,
     libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.7" % Test
   ).
  dependsOn(base)

lazy val base = (project in file("base"))
  .settings(
    name := "base",
    scalaVersion := scala213,
    libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.7" % Test

stackoverflow 上类似的大多数问题都是关于下载远程定义的模块。我遇到的问题是 sbt 找不到我的（新编译的）模块之一的过时版本。

这是 sbt 命令输出（这是一个 Emacs 缓冲区）：

sbt:toysat> reload
[info] welcome to sbt 1.5.5 (AdoptOpenJDK Java 1.8.0_292)
[info] loading project definition from /Users/drewmcdermott/BIG/RESEARCH/puzzles/toystory4/toysat/project
[info] loading settings for project root from build.sbt ...
[info] set current project to toysat (in build file:/Users/drewmcdermott/BIG/RESEARCH/puzzles/toystory4/toysat/)
sbt:toysat> compile
[info] compiling 4 Scala sources to /Users/drewmcdermott/BIG/RESEARCH/puzzles/toystory4/toysat/base/target/scala-2.13/classes ...
[warn] 
[warn]  Note: Unresolved dependencies path:
[info] done compiling
[error] stack trace is suppressed; run last trans / update for the full output
[error] (trans / update) sbt.librarymanagement.ResolveException: Error downloading base:base_2.12:0.1.0-SNAPSHOT
[error]   Not found
[error]   Not found
[error]   not found: /Users/drewmcdermott/.ivy2/localbase/base_2.12/0.1.0-SNAPSHOT/ivys/ivy.xml
[error]   not found: https://repo1.maven.org/maven2/base/base_2.12/0.1.0-SNAPSHOT/base_2.12-0.1.0-SNAPSHOT.pom
[error] Total time: 25 s, completed Jul 28, 2021 11:06:18 PM

编译base子项目中的 4 个文件花费了 25 秒，显然是成功的。我认为当 sbt 尝试编译trans子项目时它会遇到麻烦。

这是部分堆栈跟踪。这对我来说没有任何意义，只是 Coursier 参与其中。

sbt:toysat> last trans / update
[debug] not up to date. inChanged = true, force = false
[debug] Updating trans...
[warn] 
[warn]  Note: Unresolved dependencies path:
[error] sbt.librarymanagement.ResolveException: Error downloading base:base_2.12:0.1.0-SNAPSHOT
[error]   Not found
[error]   Not found
[error]   not found: /Users/drewmcdermott/.ivy2/localbase/base_2.12/0.1.0-SNAPSHOT/ivys/ivy.xml
[error]   not found: https://repo1.maven.org/maven2/base/base_2.12/0.1.0-SNAPSHOT/base_2.12-0.1.0-SNAPSHOT.pom
[error]     at lmcoursier.CoursierDependencyResolution.unresolvedWarningOrThrow(CoursierDependencyResolution.scala:258)
[error]     at lmcoursier.CoursierDependencyResolution.$anonfun$update$38(CoursierDependencyResolution.scala:227)
[error]     at lmcoursier.CoursierDependencyResolution$$Lambda$4262/0x0000000000000000.apply(Unknown Source)
[error]     at scala.util.Either$LeftProjection.map(Either.scala:573)
[error]     at lmcoursier.CoursierDependencyResolution.update(CoursierDependencyResolution.scala:227)
[error]     at sbt.librarymanagement.DependencyResolution.update(DependencyResolution.scala:60)
[error]     at sbt.internal.LibraryManagement$.resolve$1(LibraryManagement.scala:59)

很明显，某处的某个缓存正在保存 string 0.1.0-SNAPSHOT，但是缓存的数量非常多。我试过删除几个，但我没有找到相关的。

有人可以解释如何从这种情况中恢复过来吗？

4

2 回答 2

1

您的base项目仅针对 Scala 2.13 编译，而它被定义为以Scala 3dependsOn为目标的依赖项（使用） 。trans

您应该为 Scala 2.13 和 3 交叉构建您的base项目（根据您的错误消息可能是 2.12，即使我在您共享的内容中没有看到 Scala 2.12 的任何用途）。

编辑：Scala 2.13 和 3 是兼容的，所以只有在为 2.12 构建依赖项时才会出现此问题。

于 2021-07-29T16:24:14.673 回答
0

我不是因为我是一个自恋者而回答我自己的问题，而是因为我不能在评论中说出我想要什么。加上编辑原始问题会将可能有用的信息埋在一个奇怪的地方。我已经投票并批准了@GaelJ 的回答。

我的 build.sbt 看起来并没有那么不同。可以通过显示修改后的trans子项目定义来封装差异：

lazy val trans = (projectMatrix in file("trans"))
   .settings(
     name := "trans",
     version := "0.3",
     // I thought this line was unnecessary, but without 
     // it sbt doesn't understand the command trans / compile --
     Compile / scalaVersion := scala3,
     libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.7" % Test
   )
  .jvmPlatform(scalaVersions = Seq(scala213))
  .dependsOn(base)
于 2021-07-30T19:19:00.913 回答