Łączenie z bazą mongodb java

import com.mongodb.*;

import com.mongodb.client.FindIterable;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoCursor;
import com.mongodb.client.MongoDatabase;
import org.bson.Document;

import java.util.List;

public class Main
{
    static MongoClient mongoClient = new MongoClient(new MongoClientURI("mongodb://localhost:27017"));
    //powyżej to samo co tutaj (bo domyslny port)
    //MongoClient mongoClient = new MongoClient();
    static MongoDatabase database = mongoClient.getDatabase("test");

    public static void main(String[] args)
    {
        showCollections();
        //database.createCollection("people"); //tworzenie kolekcji
        showRecordsInCollection("people");
        MongoCollection<Document> collection = database.getCollection("people");
        //addOneDocument(collection);
    }
    private static void addOneDocument(MongoCollection<Document> col) {

        // Sample document.
        Document person = new Document();
        person.put("name", "John Smith");
        person.put("degree", "Master of science");

        Document person_addr = new Document();
        person_addr.put("city", "Warsaw");
        person_addr.put("zip-code", 12345);
        person.put("address", person_addr);

        col.insertOne(person);
    }
    private static void showCollections()
    {
        for (String name : database.listCollectionNames()) {

            System.out.println(name);
        }
    }

    private static void showRecordsInCollection(String collection)
    {
        FindIterable<Document> mydatabaserecords = database.getCollection(collection).find();
        for (Document doc : mydatabaserecords)
        {
            System.out.println(doc);
        }
    }


}