Multiple Flink jobs in one file

Experiment.java

package com.github.geofbot;

import org.apache.commons.cli.*;
import org.apache.commons.collections.CollectionUtils;
import org.apache.flink.api.common.functions.*;
import org.apache.flink.api.common.operators.Order;
import org.apache.flink.api.java.DataSet;
import org.apache.flink.api.java.ExecutionEnvironment;
import org.apache.flink.api.java.aggregation.Aggregations;
import org.apache.flink.api.java.operators.IterativeDataSet;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.api.java.tuple.Tuple3;
import org.apache.flink.api.java.tuple.Tuple4;
import org.apache.flink.api.java.utils.DataSetUtils;
import org.apache.flink.core.fs.FileSystem;
import org.apache.flink.util.Collector;

import java.io.File;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;

import static java.lang.Math.round;

/**
 * Experiment file
 */
public class Experiment {

	//
	//	Program
	//
	public static void main(String[] args) throws Exception {

        // Initialize the Flink environment.
        final ExecutionEnvironment env = ExecutionEnvironment.getExecutionEnvironment();

        // Read in the input data.
        DataSet<Tuple2<Integer, Integer>> e = env.fromElements(
                new Tuple2<>(0, 1),
                new Tuple2<>(1, 2),
                new Tuple2<>(2, 3),
                new Tuple2<>(2, 10)
        );

        e = e.groupBy(0).aggregate(Aggregations.SUM, 1);
        e.writeAsCsv("/tmp/e1", FileSystem.WriteMode.OVERWRITE);

        env.execute();

        final ExecutionEnvironment env2 = ExecutionEnvironment.getExecutionEnvironment();

        DataSet<Tuple2<Integer, Integer>> f = env2.readCsvFile("/tmp/e1")
                .types(Integer.class, Integer.class);
        f = f.first(2);
        f.writeAsCsv("/tmp/f1", FileSystem.WriteMode.OVERWRITE);

        env2.execute();
    }
}

@Johny-Ch Sorry, I'm not sure if this file ever worked. I made it a long time ago for my own testing

No worries will update here If I'm able to figure it out. Thank you for the prompt response.