java.lang.NoClassDefFoundError：scala/Product $ class

我是scala的新手，我正在嘗試一些示例代碼進行測試。但是，當我運行測試代碼時，我遇到了一些問題。當我運行測試，我得到一個錯誤

[trace] Stack trace suppressed: run last test:executeTests for the full output. 
[error] (test:executeTests) java.lang.NoClassDefFoundError: scala/Product$class 
[error] Total time: 3 s, completed Feb 27, 2017 6:57:15 PM

我的代碼如下

FilterChecks.scala

class filterChecks extends FlatSpec { 

    "Filter checker passed a filename which is present in directory" should "return file name" in { 
    val matchingFileName = new FileObject("match") 
    val listOfFiles = List(new FileObject("random"), matchingFileName) 
    val matchedFiles = new FilterChecker("match").findMatchedFiles(listOfFiles) 
    assert(matchedFiles == List(matchingFileName)) 

    } 
}

FilterChecker類

class FilterChecker(filter : String) { 

    def matches(content : String) = content.contains(filter); 

    def findMatchedFiles(fileObjects : List[FileObject]) = { 
    for(fileObject <- fileObjects if(matches(fileObject.name))) 
     yield fileObject 
    } 

}

文件對象

class FileObject(val name: String) { 

}

構建文件如下：

name := "testScalaProject" 

version := "1.0" 

scalaVersion := "2.12.1" 

// https://mvnrepository.com/artifact/org.scala-js/scalajs-test-interface_2.12 
libraryDependencies ++= Seq("org.scala-js" % "scalajs-test-interface_2.12" % "0.6.14", 
    "org.scalatest" % "scalatest_2.11" % "2.2.5", 
    "com.novocode" % "junit-interface" % "0.11", 
    "org.scala-lang" % "scala-library" % "2.12.1")

有人能幫助我找到了問題。在此先感謝

來源

2017-02-28 Amogh Huilgol

您的sbt構建文件是不正確的。你的scala版本是2.12.x，但是你使用的是scala版本2.11編譯的庫。使用下面

注所示的SBT設置：我改變了scalatest的版本2.X版本不再支持2.12版本斯卡拉的

scalaVersion := "2.12.1" 

libraryDependencies ++= Seq(
    "org.scala-js" %% "scalajs-test-interface" % "0.6.14", 
    "org.scalatest" %% "scalatest" % "3.0.1", //version changed as these the only versions supported by 2.12 
    "com.novocode" % "junit-interface" % "0.11", 
    "org.scala-lang" % "scala-library" % scalaVersion.value 
)

記得做reload，clean和compile在你的sbt控制檯開始清理編譯

來源

2017-02-28 00:13:04

我試着編輯上面的構建文件。但我仍然面臨同樣的錯誤 –

你在sbt中運行'reload'，'clean'和'compile'命令嗎？ –

我沒有那樣做。它在那之後起作用。感謝您的幫助:-) –

java.lang.NoClassDefFoundError：scala/Product $ class

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