从Eclipse运行Scala测试时发生异常
问题描述:
我下载了Scala IDE Linux - 64 bit For Scala 2.11.2并试图运行Scala测试。以下是我的代码。从Eclipse运行Scala测试时发生异常
package ppg.experiment.gameofbusiness.engine
import org.scalatest.FlatSpec
import org.scalatest.Matchers
class DiceSpec extends FlatSpec with Matchers {
"A dice" should "roll a value greater than zero" in {
new Dice().roll > 0
}
it should "roll a value less than six" in {
new Dice().roll < 7
}
}
当我点击右键并运行作为斯卡拉测试打印控制台
WARNING: -p has been deprecated and will be reused for a different (but still very cool) purpose in ScalaTest 2.0. Please change all uses of -p to -R.
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at scala.tools.eclipse.scalatest.launching.ScalaTestLauncher$.main(ScalaTestLauncher.scala:58)
at scala.tools.eclipse.scalatest.launching.ScalaTestLauncher.main(ScalaTestLauncher.scala)
Caused by: java.lang.NoSuchMethodError: scala.collection.immutable.$colon$colon.hd$1()Ljava/lang/Object;
at org.scalatest.tools.Runner$.argTooShort$1(Runner.scala:1515)
at org.scalatest.tools.Runner$.parseReporterArgsIntoConfigurations(Runner.scala:1532)
at org.scalatest.tools.Runner$.runOptionallyWithPassFailReporter(Runner.scala:923)
at org.scalatest.tools.Runner$.main(Runner.scala:860)
at org.scalatest.tools.Runner.main(Runner.scala)
... 6 more
有人能告诉我如何解决这个问题,以下?
答
检查你的类路径;特别是检查你所依赖的scalatest版本是否为scala 2.11编译,而不是2.10。
你是一个天才!但你能告诉我你是怎么想出来的? – 2014-11-02 17:50:42
只需阅读堆栈跟踪。一个'NoSuchMethodError'总是意味着调用不存在的方法的类(在本例中为'Runner $')是针对方法不存在的不同版本的类进行编译的(在这种情况下,“$结肠$ colon')。然后你可以查看这些类,看看它们分别属于scalatest和scala标准库。 – lmm 2014-11-03 00:09:42
顺便说一句,要做到这一点的方法是去你的项目和右键单击,然后属性> Scala编译器>选择适当的scala编译器>应用>确定 – grasshopper 2015-02-12 20:09:30