原因: java.io.NotSerializableException: org.apache.spark.SparkContext -在Spark中使用JdbcRDD时

import org.apache.spark.SparkConf;
import org.apache.spark.api.java.JavaRDD;
import org.apache.spark.api.java.JavaSparkContext;
import org.apache.spark.rdd.JdbcRDD;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class JdbcRDDExample {
    public static void main(String[] args) {
        SparkConf conf = new SparkConf().setAppName("JdbcRDDExample").setMaster("local");
        JavaSparkContext sc = new JavaSparkContext(conf);

        String url = "jdbc:mysql://localhost:3306/mydatabase";
        String user = "username";
        String password = "password";

        JdbcRDD<String> jdbcRDD = new JdbcRDD<>(sc, () -> {
            Connection conn = DriverManager.getConnection(url, user, password);
            return conn;
        }, "SELECT * FROM mytable WHERE ? <= id AND id <= ?", 1, 10, 3,
                rs -> rs.getString("name"));

        JavaRDD<String> resultRDD = jdbcRDD.toJavaRDD();
        resultRDD.foreach(System.out::println);

        sc.stop();
    }
}