Why does spark-xml fail with NoSuchMethodError with Spark 2.0.0 dependency? - scala

Question

Hi I am a noob to Scala and Intellij and I am just trying to do this on Scala:
import org.apache.spark
import org.apache.spark.sql.SQLContext
import com.databricks.spark.xml.XmlReader
object SparkSample {
def main(args: Array[String]): Unit = {
val conf = new spark.SparkConf()
conf.setAppName("Datasets Test")
conf.setMaster("local[2]")
val sc = new spark.SparkContext(conf)
val sqlContext = new SQLContext(sc)
val df = sqlContext.read
.format("com.databricks.spark.xml")
.option("rowTag", "shop")
.load("shops.xml") /* NoSuchMethod error here */
val selectedData = df.select("author", "_id")
df.show
}
Basically I am trying to convert XML into spark dataframe
I am getting a NoSuchMethod error in '.load("shops.xml")'
the Below is the SBT
version := "0.1"
scalaVersion := "2.11.3"
val sparkVersion = "2.0.0"
val sparkXMLVersion = "0.3.3"
libraryDependencies ++= Seq(
"org.apache.spark" %% "spark-core" % sparkVersion exclude("jline", "2.12"),
"org.apache.spark" %% "spark-sql" % sparkVersion excludeAll(ExclusionRule(organization = "jline"),ExclusionRule("name","2.12")),
"com.databricks" %% "spark-xml" % sparkXMLVersion,
)
Below is the trace:
Exception in thread "main" java.lang.NoSuchMethodError: org.apache.spark.sql.types.DecimalType$.Unlimited()Lorg/apache/spark/sql/types/DecimalType;
at com.databricks.spark.xml.util.InferSchema$.<init>(InferSchema.scala:50)
at com.databricks.spark.xml.util.InferSchema$.<clinit>(InferSchema.scala)
at com.databricks.spark.xml.XmlRelation$$anonfun$1.apply(XmlRelation.scala:46)
at com.databricks.spark.xml.XmlRelation$$anonfun$1.apply(XmlRelation.scala:46)
at scala.Option.getOrElse(Option.scala:120)
at com.databricks.spark.xml.XmlRelation.<init>(XmlRelation.scala:45)
at com.databricks.spark.xml.DefaultSource.createRelation(DefaultSource.scala:66)
at com.databricks.spark.xml.DefaultSource.createRelation(DefaultSource.scala:44)
at org.apache.spark.sql.execution.datasources.DataSource.resolveRelation(DataSource.scala:315)
at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:149)
at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:132)
Can someone point out the error?Seems like a dependency issue to me.
spark-core seems to be working fine but not spark-sql
I had scala 2.12 before but changed to 2.11 because spark-core was not resolved

Answer 1

tl;dr I think it's a Scala version mismatch issue. Use spark-xml 0.4.1.
Quoting spark-xml's Requirements (highlighting mine):
This library requires Spark 2.0+ for 0.4.x.
For version that works with Spark 1.x, please check for branch-0.3.
That says to me that spark-xml 0.3.3 works with Spark 1.x (not Spark 2.0.0 that you requested).