使用scalatest编写的具有单元测试的纯java项目具有编译器兼容性问题

Question

我们有一个简单的java项目，其中包含用scalatest编写的单元测试：

编译范围中的scala库( false)

• scala-compiler scalatest

• scala-library，autoScalaLibrary :=
• • • ) (autoScalaLibrary：=添加到测试范围中，以编译用scala编写的单元测试，使用添加到单元测试的测试范围)。

从intellij和命令行sbt控制台执行单元测试时出现以下错误：

scalac: error while loading package, class file '/Users/loc/Library/Caches/Coursier/v1/https/repo1.maven.org/maven2/org/scala-lang/scala-library/2.13.8/scala-library-2.13.8.jar(scala/reflect/package.class)' is broken
(class java.lang.RuntimeException/error reading Scala signature of package.class: Scala signature package has wrong version
 expected: 5.0
 found: 5.2 in package.class)

以下是简化的build.sbt文件:-

name := "pure-java-project-with-scala-tests"

//this is added for packaging
enablePlugins(PackPlugin)

//this will not add scala library to compile classpath, as our project is a pure java project
//this will also not add scala library when "sbt pack" is triggered
autoScalaLibrary := false
//this will disable cross-building, as our project is a pure java project
crossPaths := false

//this will add scalatest to test classpath, as our project unit tests will be written using scalatest
libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.10" % Test
//this will add scala library classes to test classpath, as our project unit tests will be written using scalatest
libraryDependencies += "org.scala-lang" % "scala-library" % "2.13.8" % Test

//our assumption is scala-compiler, it is required to compile scala unit tests
//but it is giving below error, when I try to execute unit test from intellij as well as sbt
libraryDependencies += "org.scala-lang" % "scala-compiler" % "2.13.8" % Test

简化的项目可以在https://github.com/moglideveloper/pure-java-project-with-scala-tests上找到

sbt gitter链接:- https://gitter.im/sbt/sbt?at=61e30f06f5a3947800088f3d

Answer 1

由于您没有为项目定义Scala版本，所以当您执行%%以包含ScalaTest时，它使用了sbt的默认版本，即2.12，从而导致二进制不兼容。

我认为最好的解决方案是使用定义项目的适当版本，并删除它的显式依赖。