Java Class not Found Exception while doing Spark-submit Scala using sbt - scala

Question

Here is my code that i wrote in scala
package normalisation
import org.apache.spark.SparkContext
import org.apache.spark.SparkContext._
import org.apache.spark.SparkConf
import org.apache.spark.sql.SQLContext
import org.apache.hadoop.fs.{FileSystem,Path}
object Seasonality {
val amplitude_list_c1: Array[Nothing] = Array()
val amplitude_list_c2: Array[Nothing] = Array()
def main(args: Array[String]){
val conf = new SparkConf().setAppName("Normalization")
val sc = new SparkContext(conf)
val sqlContext = new org.apache.spark.sql.SQLContext(sc)
val line = "MP"
val ps = "Test"
val location = "hdfs://ipaddress/user/hdfs/{0}/ps/{1}/FS/2018-10-17".format(line,ps)
val files = FileSystem.get(sc.hadoopConfiguration ).listStatus(new Path(location))
for (each <- files) {
var ps_data = sqlContext.read.json(each)
}
println(ps_data.show())
}
The error I received when compiled using sbt package is hereimage
Here is my build.sbt file
name := "OV"
scalaVersion := "2.11.8"
// https://mvnrepository.com/artifact/org.apache.spark/spark-core
libraryDependencies += "org.apache.spark" %% "spark-core" % "2.3.1"
// https://mvnrepository.com/artifact/org.apache.spark/spark-sql
libraryDependencies += "org.apache.spark" %% "spark-sql" % "2.3.1"

Answer 1

in Spark Versions > 2 you should generally use SparkSession.
See https://spark.apache.org/docs/2.3.1/api/scala/#org.apache.spark.sql.SparkSession
also then you should be able to do
val spark:SparkSession = ???
val location = "hdfs://ipaddress/user/hdfs/{0}/ps/{1}/FS/2018-10-17".format(line,ps)
spark.read.json(location)
to read all your json files in the directory.
Also I think you'd also get another compile error at
for (each <- files) {
var ps_data = sqlContext.read.json(each)
}
println(ps_data.show())
for ps_data being out of scope.
If you need to use SparkContext for some reason it should indeed be in spark-core. Have you tried restarting your IDE, cleaned caches, etc?
EDIT: I just notices that build.sbt is probably not in the directory where you call sbt package from so sbt won't pick it up