java.lang.NoClassDefFoundError:scala/Product $ class
问题描述:
我是scala的新手,我正在尝试一些示例代码进行测试。但是,当我运行测试代码时,我遇到了一些问题。当我运行测试,我得到一个错误
[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
我的代码如下
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类
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
}
}
文件对象
class FileObject(val name: String) {
}
构建文件如下:
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")
有人能帮助我找到了问题。在此先感谢
答
您的sbt构建文件是不正确的。你的scala版本是2.12.x,但是你使用的是scala版本2.11编译的库。使用下面
注所示的SBT设置:我改变了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
)
记得做reload
,clean
和compile
在你的sbt控制台开始清理编译
我试着编辑上面的构建文件。但我仍然面临同样的错误 –
你在sbt中运行'reload','clean'和'compile'命令吗? –
我没有那样做。它在那之后起作用。感谢您的帮助:-) –