Apache Zeppelin,Java错误:';'应为,但找到“类”

我使用Apache Spark的Java API从一些源(如Cassandra和HDFS)加载数据,以便在Apache Zeppelin中可视化。代码正在使用 SparkSql 和 SparkSession 不 SparkContext 并在IDE中成功测试。我将完整的代码(包含我在IDE中运行的所有代码)粘贴到Zeppelin笔记本中,并在运行完一个错误后将其粘贴到Zeppelin笔记本中 error: ';' expected but 'class' found .我认为这个错误是Scala错误,我怀疑齐柏林飞艇是否支持Spark Java API?!如果是,我如何解决问题?

Apache齐柏林飞艇版本: 0.7.3 代码如下:

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");

    }
}