java.lang.NoClassDefFoundError: scala/collection/GenTraversableOnce$class

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Expert tip

A few things cause this exception:
1) Check if you have all jars and if they're in the correct path.
2) Your classpath might be broken, you can define it in the command line with java -cp yourClassPath or at your IDE if you're using one.


you can change your scala version to 2.11.11

Solutions on the web

via Stack Overflow by user2782405
, 1 year ago
via DataStax JIRA by Big Bansal, 1 year ago
java.lang.ClassNotFoundException: scala.collection.GenTraversableOnce$class
at java.lang.ClassLoader.loadClass(
at sun.misc.Launcher$AppClassLoader.loadClass(
at java.lang.ClassLoader.loadClass(
at com.datastax.spark.connector.util.CountingIterator.(CountingIterator.scala:4)
at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:319)
at org.apache.spark.rdd.RDD.iterator(RDD.scala:283)
at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:70)
at java.util.concurrent.ThreadPoolExecutor.runWorker(
at java.util.concurrent.ThreadPoolExecutor$

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