Tomas Almeida Tomas Almeida - 1 year ago 70
Java Question

MongoDB Morphia only saving 1 user

Hi guys i'me having troubles using morphia for mongodb this is what im creating.
Im creating a spigot plugin for my hub server and im using mongodb with morphia for store my user object to my collection and this object only store 1 user instead of saving all users into the collection.

My user object

@Entity(value = "clientdata", noClassnameStored = true)
public class ClientData {

public int id;

@Indexed(options = @IndexOptions(unique = true))
private String uuid;

private String lastName, username, lastLoginDate, ip;

private int level, exp, joins, coins, pearls;

private List<Integer> hatsOwned;

public ClientData(){
this.hatsOwned = new ArrayList<>();


public int getId() {
return id;

public String getIp() {
return ip;

public void setIp(String ip) {
this.ip = ip;

public void setId(int id) { = id;

public String getUuid() {
return uuid;

public void setUuid(String uuid) {
this.uuid = uuid;

public String getLastName() {
return lastName;

public void setLastName(String lastName) {
this.lastName = lastName;

public String getUsername() {
return username;

public void setUsername(String username) {
this.username = username;

public int getLevel() {
return level;

public void setLevel(int level) {
this.level = level;

public int getExp() {
return exp;

public void setExp(int exp) {
this.exp = exp;

public int getJoins() {
return joins;

public void setJoins(int joins) {
this.joins = joins;

public void addJoins(int joins) {
this.joins += joins;

public int getCoins() {
return coins;

public void setCoins(int coins) {
this.coins = coins;

public int getPearls() {
return pearls;

public void setPearls(int pearls) {
this.pearls = pearls;

public List<Integer> getHatsOwned() {
return hatsOwned;

public void setHatsOwned(List<Integer> hatsOwned) {
this.hatsOwned = hatsOwned;

public void addNewHatOwned(int hatID){

public String getLastLoginDate() {
return lastLoginDate;

public void setLastLoginDate(String lastLoginDate) {
this.lastLoginDate = lastLoginDate;

My mongo manager class

public class MongoManager {
private static MongoManager ins = new MongoManager();

private MongoClient mc;
private Morphia morphia;
private Datastore datastore;
private ClientDAO userDAO;

public static MongoManager get() {
return ins;

public void init() {
ServerAddress addr = new ServerAddress("", 27017);
List<MongoCredential> credentials = new ArrayList<>();
credentials.add(MongoCredential.createCredential("union", "admin", "union16".toCharArray()));
mc = new MongoClient(addr, credentials);

morphia = new Morphia();;

datastore = morphia.createDatastore(mc, "admin");

userDAO = new ClientDAO(ClientData.class, datastore);

public void disconnect(){;

public ClientData getUserByPlayer(Player player) {
ClientData du = userDAO.findOne("uuid", player.getUniqueId().toString());
long time = System.currentTimeMillis();

if (du == null) {
du = new ClientData();
return du;

public void saveUser(ClientData user) {;

public List<ClientData> getAllUsers() {
return userDAO.find().asList();

Answer Source

You can't insert more than one because you have duplicateKey: you can't use an @id with primitive type without setting a unique value yourself.

You defined your id like this:

public int id;

Even though you never set any value for id, primitive types are initialized to 0, so you end up trying to insert multiple documents with the same key.


You can either :

  • change your id to String: @Id String id;
  • change your id to ObjectId: @Id ObjectId id;
  • keep @Id int id and manually set a unique value to it (player.getUniqueId() for instance).

The first 2 options will work because they won't be initialized and will be null. Mongo will then generate a unique id for you.

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