将.jar添加到类路径(Scala)
将.jar添加到类路径(Scala)
提问于 2012-04-10 02:30:34
因此，我一直在尝试使用signal-collect框架，我下载了.jar文件并将其解压缩到一个文件夹中。当前的文件夹结构如下：
LICENSE.txt
PageRank.scala
core-1.1.1-sources.jar
dependencies/
javaapi-1.1.1-sources.jar
NOTICE.txt
README.txt
core-1.1.1.jar
javaapi-1.1.1-javadoc.jar
javaapi-1.1.1.jar 其中PageRank.scala是他们提供的Scala测试代码，即：
import com.signalcollect._
object PageRank extends App {
val graph = GraphBuilder.build
graph.addVertex(new PageRankVertex(id=1))
graph.addVertex(new PageRankVertex(id=2))
graph.addEdge(new PageRankEdge(sourceId=1, targetId=2))
graph.addEdge(new PageRankEdge(sourceId=2, targetId=1))
graph.execute
graph.foreachVertex(println(_))
graph.shutdown
}
class PageRankVertex(id: Any, dampingFactor: Double=0.85)
extends DataGraphVertex(id=id, state=1-dampingFactor) {
type Signal = Double
def collect(oldState: Double, mostRecentSignals: Iterable[Double]): Double = {
1 - dampingFactor + dampingFactor * mostRecentSignals.sum
}
}
class PageRankEdge(sourceId: Any, targetId: Any)
extends DefaultEdge(sourceId, targetId) {
type SourceVertex = PageRankVertex
def signal(sourceVertex: PageRankVertex) = {
sourceVertex.state * weight / sourceVertex.sumOfOutWeights
}
}当涉及到JVM/Java/Scala时，我是一个新手，这是我尝试将.jar's添加到用于编译PageRank.scala的类路径中
$ scalac -classpath *.jar dependencies/*.jar PageRank.scala
error: IO error while decoding core-1.1.1.jar with UTF-8
Please try specifying another one using the -encoding option
error: IO error while decoding javaapi-1.1.1-javadoc.jar with UTF-8
Please try specifying another one using the -encoding option
error: IO error while decoding javaapi-1.1.1-sources.jar with UTF-8
Please try specifying another one using the -encoding option
error: IO error while decoding javaapi-1.1.1.jar with UTF-8
Please try specifying another one using the -encoding option
error: IO error while decoding dependencies/je-3.2.76.jar with UTF-8
Please try specifying another one using the -encoding option
error: IO error while decoding dependencies/scala-library-2.9.1.jar with UTF-8
Please try specifying another one using the -encoding option
6 errors found我不知道哪里出了问题……发生什么事了呢？谢谢!致敬，-kstruct
回答 3
Stack Overflow用户
回答已采纳
发布于 2012-04-10 02:41:55
您需要将两个类路径都作为单个参数传递。
试试这个：
$ scalac -classpath "*.jar:dependencies/*.jar" PageRank.scala
$ scala -classpath "*.jar:dependencies/*.jar" PageRank
PageRankVertex(id=2, state=0.9999999999999997)
PageRankVertex(id=1, state=0.9999999999999997)这对我很管用。
Stack Overflow用户
发布于 2017-06-28 19:47:06
根据安装的Java版本不同，类路径中包含多个JAR的通配符可能起作用，也可能不起作用。我在StackOverflow上的其他地方找到了this trick (请注意，你可以在'echo‘后面有任意多的文件夹，用空格分隔)：
scalac -classpath $(echo *.jar dependencies/*.jar | tr ' ' ':') PageRank.scala
scala -classpath $(echo *.jar dependencies/*.jar | tr ' ' ':') PageRankStack Overflow用户
发布于 2019-03-09 21:46:32
为简单起见，您可以只使用: scala -classpath $(echo *.jar dependencies/*.jar | tr‘':') PageRank.scala
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/10077899
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