spark scala maven error: SparkConf does not have a constructor - scala

Question

I have created a Maven project to run a wordcount spark-scala program. Here when I create my SparkConf it gives me an error "org.apache.spark.SparkConf does not have constructor". Similar for SparkContext
(org.apache.spark.SparkContext has no constructor)
I have imported both SparkContext and SparkConf and also written in the proper constructor format.This could be a Maven issue but no such error pops up related to that.
import org.apache.spark.SparkContext
import org.apache.spark.SparkConf
object WordCount {
def main(args: Array[String]) {
val cf = new SparkConf().setAppName("WordCount").setMaster("local")
val sc = new SparkContext(cf)
val rawData = sc.textFile("C:/Users/siddharth.shankar/Documents/input.txt")
val words = rawData.flatMap(line => line.split(" "))
val wordCount = words.map(word => (word, 1)).reduceByKey(_ + _)
wordCount.foreach(println)
}
}
Here is my pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.devinline.spark</groupId>
<artifactId>SparkSample2</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>SparkSample Maven Webapp</name>
<url>http://maven.apache.org</url>
<dependencies>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-core_2.11</artifactId>
<version>2.4.0</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-winutils</artifactId>
<version>2.7.1</version>
</dependency>
</dependencies>
<build>
<finalName>SparkSample2</finalName>
</build>
</project>
I don't know what the issue is here as if I apply the same program as a regular spark-scala(no maven) application the program runs without errors.

Answer 1

Check your scala version for both the cases is same or not?
It seams like version issue. I execute this code with maven it works fine with scala 2.11.
even with spark submit also it is working.

Answer 2

Try adding:
<properties>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
...
<dependency>
<groupId>org.scala-lang</groupId>
<artifactId>scala-library</artifactId>
<version>${scala.version}</version>
<scope>provided</scope>
</dependency>
...
<build>
<sourceDirectory>src/main/scala</sourceDirectory>
...
<plugins>
<plugin>
<!-- see http://davidb.github.com/scala-maven-plugin -->
<groupId>net.alchim31.maven</groupId>
<artifactId>scala-maven-plugin</artifactId>
<version>3.3.1</version>
<configuration>
<compilerPlugins>
<compilerPlugin>
<groupId>com.artima.supersafe</groupId>
<artifactId>supersafe_${scala.version}</artifactId>
<version>1.1.3</version>
</compilerPlugin>
</compilerPlugins>
</configuration>
<executions>
<execution>
<goals>
<goal>compile</goal>
<goal>testCompile</goal>
</goals>
<configuration>
<args>
<arg>-feature</arg>
<arg>-deprecation</arg>
<arg>-dependencyfile</arg>
<arg>${project.build.directory}/.scala_dependencies</arg>
</args>
</configuration>
</execution>
</executions>
</plugin>

Answer 3

</dependency>
<dependency>
<groupId>org.scala-lang</groupId>
<artifactId>scala-library</artifactId>
<version>2.11.8</version>
</dependency>
<dependency>
<groupId>org.scala-lang</groupId>
<artifactId>scala-reflect</artifactId>
<version>2.11.8</version>
</dependency>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-sql_2.11</artifactId>
<version>2.1.1</version>
</dependency>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-core_2.11</artifactId>
<version>2.1.1</version>
</dependency>
Use these dependencies will work fine.