[英]Mysterious Scalaz NoClassDefFoundError and scalaz.InvariantFunctor errors
我有以下build.sbt,并且正在运行IntelliJ管理sbt并基于sbt构建文件刷新项目的Scala 2.10.4。 一切正常,直到我添加了scalaz-streams为止-我似乎无法使用scalaz.concurrent.Task
而不会遇到以下错误之一:
// build.sbt
name := "ScalazStreamsAkka"
version := "1.0"
resolvers += "Scalaz Bintray Repo" at "http://dl.bintray.com/scalaz/releases"
resolvers ++= Seq(
Resolver.sonatypeRepo("releases"),
Resolver.sonatypeRepo("snapshots")
)
libraryDependencies += "org.scalaz" %% "scalaz-core" % "7.1.0"
libraryDependencies += "org.scalaz" %% "scalaz-concurrent" % "7.1.0"
//libraryDependencies += "org.scalaz.stream" %% "scalaz-stream" % "0.5a"
libraryDependencies += "org.typelevel" %% "scodec-core" % "1.3.0"
libraryDependencies ++= Seq(
"com.chuusai" % "shapeless_2.10.4" % "2.0.0"
)
与此build.sbt,发生此错误:
scala> import scalaz.concurrent.Task
import scalaz.concurrent.Task
scala> Task
java.lang.IncompatibleClassChangeError: Class scalaz.concurrent.Task$$anon$1 does not implement the requested interface scalaz.InvariantFunctor
如果我取消注释“ scalaz-concurrent”,则会发生相同的错误:
scala> import scalaz.concurrent.Task
import scalaz.concurrent.Task
scala> Task
java.lang.IncompatibleClassChangeError: Class scalaz.concurrent.Task$$anon$1 does not implement the requested interface scalaz.InvariantFunctor`
如果我尝试运行这些最新示例...
val ones: Process[Task,Int] = Process.constant(1)
/* A stream which emits `0, 1, 2 ... 99`. */
val zeroTo100: Process[Task,Int] = Process.range(0,100)
也会发生相同的错误。
其他时候,我遇到了这个错误:
scala> val expensiveInt: Task[Int] = Task { 41 + 1 }
java.lang.NoClassDefFoundError: Could not initialize class scalaz.concurrent.Task$
有谁知道我如何使用scalaz流而不会遇到这些奇怪的错误? 我正在尝试将scalaz流与akka演员和期货一起使用,以及可能不定型和scodec。
我自己修好了。 解决方案是创建一个新的intellij项目,删除无形的+ scodec,并通过SBT(通过添加libraryDependency + =)代替atellij的maven组件来使akka依赖关系得以解决。
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