java - InstantiationException on morphia mongodb -


im trying embed class set , insert set on morphia entity returning stacktrace.

its first time im using abstract class inside morphia entity first time seeing error.

i used abstract class because need trigger perform method when player choose kit doing /kit , kits owned player stored in set , inserted mongodb player document , saves when tried trigger perform method returns error.

caused by: java.lang.instantiationexception     @ sun.reflect.instantiationexceptionconstructoraccessorimpl.newinstance(instantiationexceptionconstructoraccessorimpl.java:48) ~[?:1.8.0_131]     @ java.lang.reflect.constructor.newinstance(constructor.java:423) ~[?:1.8.0_131]     @ org.mongodb.morphia.mapping.defaultcreator.createinstance(defaultcreator.java:72) ~[?:?]     @ org.mongodb.morphia.mapping.defaultcreator.createinstance(defaultcreator.java:91) ~[?:?]     @ org.mongodb.morphia.mapping.defaultcreator.createinstance(defaultcreator.java:105) ~[?:?]     @ org.mongodb.morphia.mapping.embeddedmapper.readmaporcollectionorentity(embeddedmapper.java:209) ~[?:?]     @ org.mongodb.morphia.mapping.embeddedmapper.readcollection(embeddedmapper.java:144) ~[?:?]     @ org.mongodb.morphia.mapping.embeddedmapper.fromdbobject(embeddedmapper.java:47) ~[?:?]     @ org.mongodb.morphia.mapping.mapper.readmappedfield(mapper.java:850) ~[?:?]     @ org.mongodb.morphia.mapping.mapper.fromdb(mapper.java:282) ~[?:?]     @ org.mongodb.morphia.mapping.mapper.fromdbobject(mapper.java:193) ~[?:?]     @ org.mongodb.morphia.query.morphiaiterator.convertitem(morphiaiterator.java:134) ~[?:?]     @ org.mongodb.morphia.query.morphiaiterator.processitem(morphiaiterator.java:146) ~[?:?]     @ org.mongodb.morphia.query.morphiaiterator.next(morphiaiterator.java:117) ~[?:?]     @ org.mongodb.morphia.query.queryimpl.get(queryimpl.java:236) ~[?:?]     @ org.mongodb.morphia.query.queryimpl.get(queryimpl.java:227) ~[?:?]     @ org.mongodb.morphia.dao.basicdao.findone(basicdao.java:178) ~[?:?]     @ eu.unionmc.kitpvp.player.playermanager.get(playermanager.java:49) ~[?:?]     @ eu.unionmc.kitpvp.commands.kitcommand.oncommand(kitcommand.java:31) ~[?:?]     @ org.bukkit.command.plugincommand.execute(plugincommand.java:44) ~[spigot.jar:git-spigot-550ebac-7019900]

player - morphia entity

@entity(value = "users", noclassnamestored = true) public class kplayer extends user{  private int kills, deaths, level; private long gold;  private playerrank currentrank;  private set<kit> ownedkits = new hashset<>();  @transient private float kdr;  public int getkills() {     return kills; }  public void setkills(int kills) {     this.kills = kills; }  public int getdeaths() {     return deaths; }  public void setdeaths(int deaths) {     this.deaths = deaths; }  public float getkdr() {     return kdr; }  public void setkdr(float kdr) {     this.kdr = kdr; }  public playerrank getcurrentrank() {     return currentrank; }  public void setcurrentrank(playerrank currentrank) {     this.currentrank = currentrank; }  public int getlevel() {     return level; }  public void setlevel(int level) {     this.level = level; }  public long getgold() {     return gold; }  public void setgold(long gold) {     this.gold = gold; }  public set<kit> getownedkits() {     return ownedkits; }  public void setownedkits(set<kit> ownedkits) {     this.ownedkits = ownedkits; }  public void addkit(kit kit){     this.ownedkits.add(kit); }  public boolean ownkit(kit kit){     return this.ownedkits.contains(kit); } }

kit class

package eu.unionmc.kitpvp.kit;  import org.bukkit.material;  public abstract class kit{  private string name; private string[] description;  private boolean locked; private int leveltoapply;  private long cost;  private material icon;  public kit() { }  public kit(string name, boolean locked, int leveltoapply, long cost, material icon, string... description) {     this.name = name;     this.description = description;     this.locked = locked;     this.leveltoapply = leveltoapply;     this.cost = cost;     this.icon = icon; }   public string getname() {     return name; }  public void setname(string name) {     this.name = name; }  public string[] getdescription() {     return description; }  public void setdescription(string[] description) {     this.description = description; }  public boolean islocked() {     return locked; }  public void setlocked(boolean locked) {     this.locked = locked; }  public int getleveltoapply() {     return leveltoapply; }  public void setleveltoapply(int leveltoapply) {     this.leveltoapply = leveltoapply; }  public material geticon() {     return icon; }  public void seticon(material icon) {     this.icon = icon; }  public long getcost() {     return cost; }  public void setcost(long cost) {     this.cost = cost; }  public abstract void apply();  }

playermanager class

public class playermanager implements crud<kplayer,player> {  private kitpool pool;  public playermanager(kitpool pool) {     this.pool = pool; }  public kplayer create(player p){     kplayer kp = alreadyexists(p.getuniqueid().tostring());      if(kp == null){         kp = new kplayer();          kp.setuuid(p.getuniqueid().tostring());         kp.setusername(p.getname());         kp.setentity(p);          kp.setlevel(0);         kp.setcurrentrank(playerrank.none);         kp.setkdr(0);         kp.setkills(0);         kp.setdeaths(0);         kp.setgold(0);         kp.addkit(new pvp());         update(kp);     }      return kp; }  @override public kplayer get(player entry) {     return pool.getplayerref().findone("uuid", entry.getuniqueid().tostring()); }  @override public void update(kplayer entry) {     pool.getplayerref().save(entry); }  @override public void delete(kplayer entry) {     pool.getplayerref().delete(entry); }  @override public kplayer alreadyexists(string entry) {     return pool.getplayerref().findone("uuid", entry); }  }

kit command class

public class kitcommand implements commandexecutor {  kitpvp plugin;  public kitcommand(kitpvp plugin) {     this.plugin = plugin; }  @override public boolean oncommand(commandsender sender, command command, string s, string[] args) {     if(!(sender instanceof player)) return true;      player p = (player) sender;     kplayer kp = plugin.getplayermanager().get(p);      list<string> kitnames = plugin.getkitmanager().getkits().stream().map(kit::getname).collect(collectors.tolist());     string names = stringutils.join(kitnames, ", ");      if(args.length == 0){         p.sendmessage("§cusage: /kit <kitname>");         p.sendmessage("§ekits: §6"+names);         return  true;     }      if(kp == null) return true;      if(plugin.getkitmanager().getkitbyname(args[0]) == null){         p.sendmessage("§cthis kit doens't exists.");         return true;     }      plugin.getkitmanager().perform(p, kp, plugin.getkitmanager().getkitbyname(args[0]));      return false; } }

give kplayer default no args constructor auth public access , should fix exception


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