当我在 ScalaIDE 中运行我的代码时，为什么会出现 `java.lang.NoClassDefFoundError: scala/Function1`？
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Why do I get `java.lang.NoClassDefFoundError: scala/Function1` when I run my code in ScalaIDE?
提问by blue-sky
Here is a simple test I'm using to invoke a Scala method from Java:
这是我用来从 Java 调用 Scala 方法的一个简单测试：
public static void main(String args[]) {
java.util.Map<String, java.util.List<String>> rec = news.recommend.DriverObj.runTest();
System.out.println(rec.toString());
}
Here is the definition of the Scala method:
这是 Scala 方法的定义：
def runTest: java.util.Map[String, java.util.List[String]] = {
new java.util.HashMap[String, java.util.List[String]]
}
But it throws an error:
但它抛出一个错误：
Exception in thread "main" java.lang.NoClassDefFoundError: scala/Function1
at news.recommend.DriverObj.runTest(DriverObj.scala)
What should I do to make this running smoothly?
我应该怎么做才能使这个运行顺利？
Update : I'm running it via Eclipse and my build path contains :
更新：我通过 Eclipse 运行它，我的构建路径包含：
So Scala library should be found ?
那么应该找到 Scala 库吗？
采纳答案by Riduidel
adding the Scala dependency to the maven build can fix the issue :
将 Scala 依赖项添加到 Maven 构建可以解决此问题：
<dependency>
<groupId>org.scala-lang</groupId>
<artifactId>scala-library</artifactId>
<version>2.10.3</version>
</dependency>
回答by Kuang Wenyi
As for me, in the configuration of "Run/Debug configurations" [idealJ]
至于我，在“运行/调试配置”的配置中[idealJ]
remember to choose the "Include dependencies with "Provided" scope"
请记住选择“包含具有“提供”范围的依赖项”
