具有Java错误的Apache Zeppelin：“;” 预期但找到“班级”

Question

I use Apache Spark's Java API to load data from some sources(like Cassandra and HDFS) for visualization in Apache Zeppelin. The code is using SparkSql and SparkSession , not SparkContext and tested successfully in IDE. I paste the full code (containing all codes that I run in IDE) into Zeppelin notebook and after running it through an error error: ';' expected but 'class' found error: ';' expected but 'class' found . I think this error is a Scala error and I suspect does Zeppelin support Spark Java API?! If yes, how can I solve the problem?

Apache Zeppelin version: 0.7.3 The following is the code:

import org.apache.spark.sql.Dataset;
import org.apache.spark.sql.Row;
import org.apache.spark.sql.SparkSession;
import java.util.HashMap;

public class LoadCSV {
    public static void main(String[] args) {
        HashMap<String, String> ops = new HashMap();
        ops.put("table", "grades");
        ops.put("keyspace", "zeppline");

        SparkSession spark = SparkSession
                .builder()
                .master("local[*]")
                .appName("Java Spark SQL basic example")
                .config("spark.cassandra.connection.host", "127.0.0.1")
                .config("spark.cassandra.connection.port", "9042")
                .getOrCreate();

        Dataset<Row> df1 = spark.read()
                .format("csv")
                .option("header", true)
                .option("inferSchema", true)
                .csv("hdfs://localhost:54310/Data/Zeppline/grades.csv");


        Dataset<Row> df2 = spark.read()
                .format("org.apache.spark.sql.cassandra")
                .options(ops)
                .load()
                .select("id","first_name", "last_name", "ssn", "test1", "test2", "test3", "test4", "final", "grade");

        df1.union(df2).createOrReplaceTempView("grades");

    }
}

Answer 1

I suspect does Zeppelin support Spark JAVA API?

It does not. You can fin a full list of avialable interpreters on the Zeppelin website ( https://zeppelin.apache.org/docs/latest/manual/interpreters.html ) and there is no Java interpreter there.