Question

So I’ve been trying to work with the signal-collect framework and I downloaded the .jar files and extracted it into a folder. Currently the folder structure looks like:

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  

Where PageRank.scala is the Scala test code they provide, which is:

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
  }

}

I am a newbie when it comes to the JVM/Java/Scala, and this was my attempt at adding the .jar's to the classpath for compiling PageRank.scala:

$ 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

I cannot figure out what is going wrong… what’s happening?
Thanks!
Regards,
-kstruct

Answer 1

You need to pass both classpath paths as a single argument.

Try this:

$ 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)

It worked for me.