Trying to populate Java Pojo class with MongoDB collection and getting null

Question

I am trying to populate the Java POJO class with the Mongo DB collection but getting null when trying to get data from the Pojo class

Here CSVRow is the POJO class name

The class constructor

MongoDatabase database;

MongoDbUtils() {
    String uri = "mongodb://localhost:27017/?maxPoolSize=20&w=majority";

    //This registry is required for your Mongo document to POJO conversion
    ConnectionString connectionString = new ConnectionString(uri);
    CodecRegistry pojoCodecRegistry = fromProviders(PojoCodecProvider.builder().automatic(true).build());
    CodecRegistry codecRegistry = fromRegistries(MongoClientSettings.getDefaultCodecRegistry(), pojoCodecRegistry);
    MongoClientSettings clientSettings = MongoClientSettings.builder()
            .applyConnectionString(connectionString)
            .codecRegistry(codecRegistry)
            .build();
    MongoClient mongoClient = MongoClients.create(clientSettings);
    database = mongoClient.getDatabase("StudyPriceDataTest");
}

Function to retrieve data from POJO

public MongoCollection<CsvRow> RetriveAllDocumentsInCSVRows(String collectionName) {
    System.out.println(collectionName);
    MongoCollection<CsvRow> collection = database.getCollection(collectionName, CsvRow.class);
    List<CsvRow> csvRows = collection.find(new Document(), CsvRow.class).into(new ArrayList<CsvRow>());
    for(CsvRow doc:csvRows) {
        System.out.println("vinsds="+doc.getVin()); **<-- here I am getting null**
    }
    return collection;
}

I tried with the code mentioned and I am expecting to get the data from the POJO

Answer 1

We can use

 public List<CsvRow> RetriveAllDocumentsInCSVRows(String collectionName) {
    List<CsvRow> userList = new ArrayList<CsvRow>();
    List<CsvRow> collection = database.getCollection(collectionName, CsvRow.class).find().into(userList);
    // return all documents in the collection
    for (CsvRow u : userList) {
        System.out.println(u.getVin());
    }

    return collection;
}