Scala Hello World in Scala IDE

Posted on by vk

After downloading ScalaIDE and after installing https://github.com/sonatype/m2eclipse-scala, still ran into the issue of not finding the right arch-type. Solved by adding a remote catalog: http://repo1.maven.org/maven2/archetype-catalog.xml

Here is the POM XML

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<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/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.vitarkah.scala</groupId>
  <artifactId>first</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <name>${project.artifactId}</name>
  <description>My wonderfull scala app</description>
  <inceptionYear>2015</inceptionYear>
  <licenses>
    <license>
      <name>My License</name>
      <url>http://....</url>
      <distribution>repo</distribution>
    </license>
  </licenses>

  <properties>
    <maven.compiler.source>1.6</maven.compiler.source>
    <maven.compiler.target>1.6</maven.compiler.target>
    <encoding>UTF-8</encoding>
    <scala.version>2.10.6</scala.version>
    <scala.compat.version>2.10</scala.compat.version>
  </properties>

  <pluginRepositories>
    <pluginRepository>
      <id>scala-tools.org</id>
      <name>Scala-tools Maven2 Repository</name>
      <url>http://scala-tools.org/repo-releases</url>
    </pluginRepository>
  </pluginRepositories>

  <dependencies>
    <dependency>
      <groupId>org.apache.spark</groupId>
      <artifactId>spark-core_2.10</artifactId>
      <version>1.6.0</version>
    </dependency>
    <dependency>
      <groupId>org.apache.spark</groupId>
      <artifactId>spark-mllib_2.10</artifactId>
      <version>1.6.0</version>
    </dependency>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.1</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.scalactic</groupId>
      <artifactId>scalactic_2.10</artifactId>
      <version>2.2.6</version>
    </dependency>
    <dependency>
      <groupId>org.scalatest</groupId>
      <artifactId>scalatest_2.10</artifactId>
      <version>2.2.6</version>
      <scope>test</scope>
    </dependency>
  </dependencies>

  <build>
    <plugins>
      <!-- mixed scala/java compile -->
      <plugin>
        <groupId>org.scala-tools</groupId>
        <artifactId>maven-scala-plugin</artifactId>
        <executions>
          <execution>
            <id>compile</id>
            <goals>
              <goal>compile</goal>
            </goals>
            <phase>compile</phase>
          </execution>
          <execution>
            <id>test-compile</id>
            <goals>
              <goal>testCompile</goal>
            </goals>
            <phase>test-compile</phase>
          </execution>
          <execution>
            <phase>process-resources</phase>
            <goals>
              <goal>compile</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <configuration>
          <source>1.7</source>
          <target>1.7</target>
        </configuration>
      </plugin>
      <!-- for fatjar -->
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-assembly-plugin</artifactId>
        <version>2.4</version>
        <configuration>
          <descriptorRefs>
            <descriptorRef>jar-with-dependencies</descriptorRef>
          </descriptorRefs>
        </configuration>
        <executions>
          <execution>
            <id>assemble-all</id>
            <phase>package</phase>
            <goals>
              <goal>single</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-jar-plugin</artifactId>
        <configuration>
          <archive>
            <manifest>
              <addClasspath>true</addClasspath>
              <mainClass>fully.qualified.MainClass</mainClass>
            </manifest>
          </archive>
        </configuration>
      </plugin>
    </plugins>
    <pluginManagement>
      <plugins>
        <!--This plugin's configuration is used to store Eclipse m2e settings
          only. It has no influence on the Maven build itself. -->
        <plugin>
          <groupId>org.eclipse.m2e</groupId>
          <artifactId>lifecycle-mapping</artifactId>
          <version>1.0.0</version>
          <configuration>
            <lifecycleMappingMetadata>
              <pluginExecutions>
                <pluginExecution>
                  <pluginExecutionFilter>
                    <groupId>org.scala-tools</groupId>
                    <artifactId>
                      maven-scala-plugin
                    </artifactId>
                    <versionRange>
                      [2.15.2,)
                    </versionRange>
                    <goals>
                      <goal>compile</goal>
                      <goal>testCompile</goal>
                    </goals>
                  </pluginExecutionFilter>
                  <action>
                    <execute></execute>
                  </action>
                </pluginExecution>
              </pluginExecutions>
            </lifecycleMappingMetadata>
          </configuration>
        </plugin>
      </plugins>
    </pluginManagement>
  </build>

</project>

Here is the “hello world” Scala app

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package com.vitarkah.scala.first
import org.apache.spark.SparkContext
import org.apache.spark.SparkContext._
import org.apache.spark.SparkConf
/**
 * @author ${user.name}
 */
object App {
 
def main(args: Array[String]) {

    // initialise spark context
    val conf = new SparkConf().setAppName("HelloWorld").setMaster("local")
    val sc = new SparkContext(conf)
   
    // do stuff
    println("Hello, world!")
   
    // terminate spark context
    sc.stop()
   
  }

}

Here is the output

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Using Spark's default log4j profile: org/apache/spark/log4j-defaults.properties
16/02/14 21:04:59 INFO SparkContext: Running Spark version 1.6.0
16/02/14 21:04:59 WARN NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
16/02/14 21:05:00 WARN Utils: Your hostname, vichu-Lenovo-Z50-70 resolves to a loopback address: 127.0.1.1; using 192.168.1.140 instead (on interface wlan0)
16/02/14 21:05:00 WARN Utils: Set SPARK_LOCAL_IP if you need to bind to another address
16/02/14 21:05:00 INFO SecurityManager: Changing view acls to: vichu
16/02/14 21:05:00 INFO SecurityManager: Changing modify acls to: vichu
16/02/14 21:05:00 INFO SecurityManager: SecurityManager: authentication disabled; ui acls disabled; users with view permissions: Set(vichu); users with modify permissions: Set(vichu)
16/02/14 21:05:00 INFO Utils: Successfully started service 'sparkDriver' on port 51488.
16/02/14 21:05:00 INFO Slf4jLogger: Slf4jLogger started
16/02/14 21:05:01 INFO Remoting: Starting remoting
16/02/14 21:05:01 INFO Remoting: Remoting started; listening on addresses :[akka.tcp://sparkDriverActorSystem@192.168.1.140:38851]
16/02/14 21:05:01 INFO Utils: Successfully started service 'sparkDriverActorSystem' on port 38851.
16/02/14 21:05:01 INFO SparkEnv: Registering MapOutputTracker
16/02/14 21:05:01 INFO SparkEnv: Registering BlockManagerMaster
16/02/14 21:05:01 INFO DiskBlockManager: Created local directory at /tmp/blockmgr-37186a0b-a60a-41d7-8561-fd4054ef67f7
16/02/14 21:05:01 INFO MemoryStore: MemoryStore started with capacity 1088.6 MB
16/02/14 21:05:01 INFO SparkEnv: Registering OutputCommitCoordinator
16/02/14 21:05:01 INFO Utils: Successfully started service 'SparkUI' on port 4040.
16/02/14 21:05:01 INFO SparkUI: Started SparkUI at http://192.168.1.140:4040
16/02/14 21:05:01 INFO Executor: Starting executor ID driver on host localhost
16/02/14 21:05:01 INFO Utils: Successfully started service 'org.apache.spark.network.netty.NettyBlockTransferService' on port 50884.
16/02/14 21:05:01 INFO NettyBlockTransferService: Server created on 50884
16/02/14 21:05:01 INFO BlockManagerMaster: Trying to register BlockManager
16/02/14 21:05:01 INFO BlockManagerMasterEndpoint: Registering block manager localhost:50884 with 1088.6 MB RAM, BlockManagerId(driver, localhost, 50884)
16/02/14 21:05:01 INFO BlockManagerMaster: Registered BlockManager

Hello, world! <<--- There it is!


16/02/14 21:05:01 INFO SparkUI: Stopped Spark web UI at http://192.168.1.140:4040
16/02/14 21:05:01 INFO MapOutputTrackerMasterEndpoint: MapOutputTrackerMasterEndpoint stopped!
16/02/14 21:05:01 INFO MemoryStore: MemoryStore cleared
16/02/14 21:05:01 INFO BlockManager: BlockManager stopped
16/02/14 21:05:01 INFO BlockManagerMaster: BlockManagerMaster stopped
16/02/14 21:05:01 INFO OutputCommitCoordinator$OutputCommitCoordinatorEndpoint: OutputCommitCoordinator stopped!
16/02/14 21:05:01 INFO SparkContext: Successfully stopped SparkContext
16/02/14 21:05:01 INFO RemoteActorRefProvider$RemotingTerminator: Shutting down remote daemon.
16/02/14 21:05:01 INFO RemoteActorRefProvider$RemotingTerminator: Remote daemon shut down; proceeding with flushing remote transports.
16/02/14 21:05:01 INFO ShutdownHookManager: Shutdown hook called
16/02/14 21:05:01 INFO ShutdownHookManager: Deleting directory /tmp/spark-44aa9e76-6aec-4162-8856-c1605c8f060c

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