Java Bean to JSON

serdes.java

package com.rambo;

import com.arangodb.ArangoDBException;
import com.arangodb.entity.BaseDocument;
import com.arangodb.entity.CollectionEntity;
import com.arangodb.velocypack.VPack;
import com.arangodb.velocypack.VPackSlice;
import org.msgpack.MessagePack;
import com.arangodb.ArangoDB;

import java.io.IOException;
import java.time.LocalDateTime;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * Hello world!
 */
public class App {
    private static final String ARANGO_USER = "root";
    private static final String ARANGO_PASSWORD = "closedSesame";
    private static String ARANGO_HOST = "134.209.83.172";
    private static int ARANGO_PORT = 8080;
    private static ArangoDB arangoDB = new ArangoDB.Builder().host(ARANGO_HOST, ARANGO_PORT)
            .user(ARANGO_USER).password(ARANGO_PASSWORD).build();
    private static String dbName = "cache";
    private static String collectionName = "cache1";

    public static void messagePack() throws IOException {
        System.out.println("Hello World!");

        Person person = new Person("Ali", 21);
        System.out.println(person);

        MessagePack mp = new MessagePack();
        mp.register(Person.class);

        byte[] raw = mp.write(person);

        System.out.println(raw);

        Person person2 = new Person("a", 1);
        person2 = mp.read(raw, Person.class);
        System.out.println(person2);
//        Value dynamic = mp.read(raw);
//        System.out.println(dynamic);
    }

    private static void velocyPack() {
        Person entity = new Person("Veli", 34);
        VPack vpack = new VPack.Builder().build();
        VPackSlice slice = vpack.serialize(entity);
        System.out.println(slice.toString());


        Person entity2 = vpack.deserialize(slice, Person.class);
        System.out.println(entity2);
    }

    // Create collection
    private static void arango1() {
        final ArangoDB arangoDB = new ArangoDB.Builder().host("127.0.0.1", 8529).build();
        String dbName = "cache";
        String collectionName = "firstCollection4";
        try {
            CollectionEntity myArangoCollection = arangoDB.db(dbName).createCollection(collectionName);
            System.out.println("Collection created: " + myArangoCollection.getName());
        } catch (ArangoDBException e) {
            System.err.println("Failed to create collection: " + collectionName + "; " + e.getMessage());
        } finally {
            arangoDB.shutdown();
        }

    }


    private static void arango3() {
        BaseDocument myObject = new BaseDocument();
        myObject.addAttribute("a", "Foo");
        myObject.addAttribute("b", 42);
        try {
            arangoDB.db(dbName).collection(collectionName).insertDocument(myObject);
            System.out.println("Document created");
        } catch (ArangoDBException e) {
            System.err.println("Failed to create document. " + e.getMessage());
        } finally {
            arangoDB.shutdown();
        }


    }

    private static void arangoDate() {
        //Create formatter
        long unixTime = System.currentTimeMillis() / 1000L;

        fineTuneDateTime(ZonedDateTime.now());

        DateTimeFormatter FORMATTER = DateTimeFormatter.ISO_INSTANT;

        //Local date time instance
        LocalDateTime localDateTime = LocalDateTime.now();
        System.out.println("localDateTime");
        System.out.println(localDateTime);


        ZonedDateTime now = ZonedDateTime.now();


        System.out.println("ZonedDateTime");
        System.out.println(now);


        System.out.println(DateTimeFormatter.ISO_OFFSET_DATE_TIME.format(now));
    }

    private static String fineTuneDateTime(ZonedDateTime zdt) {
        System.out.println("--=== fineTuneDateTime ===---");
        System.out.print("zdt:");
        System.out.println(zdt);

        String nowStr = DateTimeFormatter.ofPattern("yyyy-MM-dd'T'H.m.s'Z'x").format(zdt);
        System.out.print("nowStr:");
        System.out.println(nowStr+" ZONE: "+zdt.getOffset().toString());
        // nowStr = 2019-05-27T05:34:16.245+03:00
        String[] parts = nowStr.split(".");


        // parts[0] = 2019-05-27T02:20:08
        // parts[1] = 225Z

        System.out.print("parts:");
        System.out.println(String.valueOf(parts));
        System.out.println("-----------------------------");

        return "1";
    }

    private static void insertDate1() {
        /*
        * * `2019-05-27`: May 27th 2019, 00:00:00 UTC time
         * `2019-05-27T21:20:00`: May 27th 2019, 21:20:00 UTC time
         * `2019-05-27T21:20:00Z`: May 27th 2019, 21:20:00 UTC time
         * `2019-05-27T21:20:00.123Z`: May 27th 2019, 21:20:00.123 UTC time
         * `2019-05-27T21:20:00.123+01:30`: May 27th 2019, 21:20:00.123, +01:30 offset from UTC time
         * `2019-05-27T21:20:00.123-02:00`: May 27th 2019, 21:20:00.123, -02:00 offset from UTC time
        * */
        String[] dates = new String[]{
                "2019-05-29T02:18:00",
                "2019-05-29T02:18:00Z",
                "2019-05-29T02:18:00+03:00",
                "2019-05-29T02:18:00.123Z",
                "2019-05-29T02:18:00.123+03:00",

                "2019-05-29T05:18:00", //not removed
                "2019-05-29T05:18:00Z", //not removed
                "2019-05-29T05:18:00+03:00",
                "2019-05-29T05:18:00.123Z",//not removed
                "2019-05-29T05:18:00.123+03:00",
        };
        try {
            AtomicInteger index = new AtomicInteger();
            for (String date : dates) {
                BaseDocument myObject = new BaseDocument();
                myObject.addAttribute("index", String.valueOf(index.get()));
                myObject.addAttribute("expireAfter", date);
                arangoDB.db(dbName).collection(collectionName).insertDocument(myObject);
                System.out.println(myObject);
                index.getAndIncrement();
            }
            System.out.println("Finished");
        } catch (ArangoDBException e) {
            System.err.println("Failed to create document. " + e.getMessage());
        } finally {
            arangoDB.shutdown();
        }

    }

    public static void main(String[] args) throws IOException {
        insertDate1();
//        arangoDate();
    }
}