Spark：有没有办法打印出spark-shell和spark的类路径？

我可以在 Spark-shell 中成功运行 Spark 作业，但是当它打包并通过 Spark-submit 运行时，我收到 NoSuchMethodError。

这向我表明类路径存在某种不匹配。有没有办法可以比较两个类路径？某种日志记录语句？

Thanks!

15/05/28 12:46:46 ERROR Executor: Exception in task 1.0 in stage 0.0 (TID 1)
java.lang.NoSuchMethodError: scala.Predef$.ArrowAssoc(Ljava/lang/Object;)Ljava/lang/Object;
    at com.ldamodel.LdaModel$$anonfun$5$$anonfun$apply$5.apply(LdaModel.scala:22)
    at com.ldamodel.LdaModel$$anonfun$5$$anonfun$apply$5.apply(LdaModel.scala:22)
    at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
    at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
    at scala.collection.IndexedSeqOptimized$class.foreach(IndexedSeqOptimized.scala:33)
    at scala.collection.mutable.WrappedArray.foreach(WrappedArray.scala:34)
    at scala.collection.TraversableLike$class.map(TraversableLike.scala:244)
    at scala.collection.AbstractTraversable.map(Traversable.scala:105)
    at com.ldamodel.LdaModel$$anonfun$5.apply(LdaModel.scala:22)
    at com.ldamodel.LdaModel$$anonfun$5.apply(LdaModel.scala:22)
    at scala.collection.Iterator$$anon$13.hasNext(Iterator.scala:371)
    at org.apache.spark.util.collection.ExternalSorter.insertAll(ExternalSorter.scala:202)
    at org.apache.spark.shuffle.sort.SortShuffleWriter.write(SortShuffleWriter.scala:56)
    at org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:68)
    at org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:41)
    at org.apache.spark.scheduler.Task.run(Task.scala:64)
    at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:203)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

I think 这应该有效 http://www.mkyong.com/java/how-to-print-out-the-current-project-classpath/:

    import java.lang.ClassLoader
    val cl = ClassLoader.getSystemClassLoader
    cl.asInstanceOf[java.net.URLClassLoader].getURLs.foreach(println)