Spark Core (1.5.2) and Scala.collection.mutable.Map [duplicate] - apache-spark

Question

I have a simple scala object file with the following content:
import org.apache.spark.SparkContext
import org.apache.spark.SparkContext._
import org.apache.spark.SparkConf
object X {
def main(args: Array[String]) {
val params = Map[String, String](
"abc" -> "22",)
println("Creating Spark Configuration");
val conf = new SparkConf().setAppName("X")
val sc = new SparkContext(conf)
val txtFileLines = sc.textFile("/tmp/x.txt", 2).cache()
val count = txtFileLines.count()
println("Count" + count)
}
}
My build.sbt looks like:
name := "x"
version := "1.0"
scalaVersion := "2.11.7"
libraryDependencies += "org.apache.spark" %% "spark-core" % "1.5.2" % "provided"
I then do sbt package to create x.jar under target/scala-2.11/
When I execute the above code as:
spark-submit --class X --master local[2] x.jar
I get the following error:
Creating Spark Configuration
Exception in thread "main" java.lang.NoSuchMethodError: scala.Predef$.ArrowAssoc(Ljava/lang/Object;)Ljava/lang/Object;
at Sweeper$.main(Sweeper.scala:14)
at Sweeper.main(Sweeper.scala)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:674)
at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:180)
at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:205)
at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:120)
at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)

Answer 1

As you are using Scala 2.11 in your project. You should use spark core library build for Scala 2.11.
Can download spark-core_2.11 from here http://mvnrepository.com/search?q=Spark
Refer spark-core_2.11 jar in project.