ClassCastException from JavaPairRDD.collectAsMap()

CheckpointBug.java

package org.facboy.spark;

import org.apache.spark.SparkConf;
import org.apache.spark.api.java.JavaPairRDD;
import org.apache.spark.api.java.JavaRDD;
import org.apache.spark.api.java.JavaSparkContext;

import scala.Tuple2;
import scala.reflect.ClassTag;
import scala.reflect.ClassTag$;

import com.google.common.collect.ImmutableList;

/**
 * @author Christopher Ng
 */
public class CheckpointBug {
    public static void main(String[] args) {
        SparkConf conf = new SparkConf().setAppName("Checkpoint Application").setMaster("local[8]");
        conf.set("spark.serializer", "org.apache.spark.serializer.KryoSerializer");

        JavaSparkContext sparkContext = new JavaSparkContext(conf);
        sparkContext.setCheckpointDir("checkpoints");

        JavaPairRDD<String, Integer> rdd = JavaPairRDD.fromJavaRDD(sparkContext.parallelize(ImmutableList.of(
                new Tuple2<>("a", 1),
                new Tuple2<>("a", 3),
                new Tuple2<>("b", 2),
                new Tuple2<>("b", 6),
                new Tuple2<>("c", 3),
                new Tuple2<>("c", 4)
        )))
                .reduceByKey((v1, v2) -> v1 + v2);
        rdd.checkpoint();
        System.out.println("rdd: " + rdd.collectAsMap());

        String checkpointFile = rdd.getCheckpointFile().get();

        ClassTag<Tuple2<String, Integer>> classTag = ClassTag$.MODULE$.apply(Tuple2.class);
        JavaPairRDD<String, Integer> checkpointedClassTag = JavaPairRDD.fromJavaRDD(
                    new JavaRDD<>(JavaSparkContext.toSparkContext(sparkContext).checkpointFile(checkpointFile, classTag), classTag));
        System.out.println("class tag checkpoint rdd: " + checkpointedClassTag.collectAsMap());


        JavaPairRDD<String, Integer> checkpointed = JavaPairRDD.fromJavaRDD(sparkContext.<Tuple2<String, Integer>>checkpointFile(checkpointFile));
        System.out.println("java checkpoint rdd: " + checkpointed.collectAsMap());
    }
}

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<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>org.facboy.spark</groupId>
    <artifactId>spark-bugs</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <spark.version>1.1.0</spark.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
            <version>18.0</version>
        </dependency>
        <dependency>
            <groupId>com.google.inject</groupId>
            <artifactId>guice</artifactId>
            <version>3.0</version>
        </dependency>

        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.3.2</version>
        </dependency>
        <dependency> <!-- Spark dependency -->
            <groupId>org.apache.spark</groupId>
            <artifactId>spark-core_2.10</artifactId>
            <version>${spark.version}</version>
        </dependency>
        <dependency> <!-- Spark dependency -->
            <groupId>org.apache.spark</groupId>
            <artifactId>spark-streaming_2.10</artifactId>
            <version>${spark.version}</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.1</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>