Java scala.swing NoClassDefFoundError

我有一个非常简单的项目，包括一个

.scala

文件、一个

build.sbt

文件和一个

/lib

文件夹，其中有一个

.jar

。我的scalaVersion设置为2.10.5（为了向后兼容），我运行了

sbt compile

，并下载了scala-2.10和scala-swing的.jars。所以这部分似乎起作用了

当我执行

sbt运行时

会出现运行时错误：

[info] Running GuiProgramOne 
[error] (run-main-0) java.lang.NoClassDefFoundError: scala/collection/GenTraversableLike$class
java.lang.NoClassDefFoundError: scala/collection/GenTraversableLike$class
    at scala.swing.RefSet.<init>(Publisher.scala:167)
    at scala.swing.Publisher$$anon$1.<init>(Publisher.scala:34)
    at scala.swing.Publisher$class.$init$(Publisher.scala:34)
    at scala.swing.Window.<init>(Window.scala:25)
    at scala.swing.Frame.<init>(RichWindow.scala:77)
    at scala.swing.MainFrame.<init>(MainFrame.scala:19)
    at UI.<init>(UI.scala:3)
    at GuiProgramOne$.main(UI.scala:11)
    at GuiProgramOne.main(UI.scala)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
Caused by: java.lang.ClassNotFoundException: scala.collection.GenTraversableLike$class
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at scala.swing.RefSet.<init>(Publisher.scala:167)
    at scala.swing.Publisher$$anon$1.<init>(Publisher.scala:34)
    at scala.swing.Publisher$class.$init$(Publisher.scala:34)
    at scala.swing.Window.<init>(Window.scala:25)
    at scala.swing.Frame.<init>(RichWindow.scala:77)
    at scala.swing.MainFrame.<init>(MainFrame.scala:19)
    at UI.<init>(UI.scala:3)
    at GuiProgramOne$.main(UI.scala:11)
    at GuiProgramOne.main(UI.scala)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
[trace] Stack trace suppressed: run last compile:run for the full output.
java.lang.RuntimeException: Nonzero exit code: 1
    at scala.sys.package$.error(package.scala:27)

build.sbt：

lazy val root = (project in file(".")).
  settings(
    inThisBuild(List(
      scalaVersion := "2.10.5"
    )),
    name := "Game of Life",
    libraryDependencies ++= Seq(
      "org.scala-lang" % "scala-swing" % "2.9.1"
    )
  )

---

代码：

您的scala版本是2.10.5，因此scala swing版本应该是scala-

swing-2.10.5.jar

。因此，您应该更改build.sbt文件，如下所示

libraryDependencies ++= Seq(
      "org.scala-lang" % "scala-swing" % scalaVersion.value
    )

---

而且您不需要lib目录中的

scala-swing-2.9.1.jar

，因为您已经在build.sbt中声明了依赖关系。因此，删除它以避免托管依赖项和非托管依赖项之间的任何潜在冲突

万岁，谢谢你，成功了！！事实上，我试着让它们都成为2.10.6版本，但没有成功，但是10.5版本起作用了。我不知道为什么，但我现在就要了

libraryDependencies ++= Seq(
      "org.scala-lang" % "scala-swing" % scalaVersion.value
    )