InstantiationException on morphia mongodb

私は、クラスをセットに埋め込み、そのセットをモチーフのエンティティに挿入しようとしましたが、そのスタックトレースを返しています。InstantiationException on morphia mongodb

初めて、このエラーが発生したのは、初めてmorphiaエンティティ内で抽象クラスを使用していることです。

プレイヤーが/ kitを実行して自分のキットを選択したときにperformメソッドをトリガーする必要があるため抽象クラスを使用しました。 performメソッドをトリガーしようとすると、そのエラーを返します。

Caused by: java.lang.InstantiationException 
    at sun.reflect.InstantiationExceptionConstructorAccessorImpl.newInstance(InstantiationExceptionConstructorAccessorImpl.java:48) ~[?:1.8.0_131] 
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[?:1.8.0_131] 
    at org.mongodb.morphia.mapping.DefaultCreator.createInstance(DefaultCreator.java:72) ~[?:?] 
    at org.mongodb.morphia.mapping.DefaultCreator.createInstance(DefaultCreator.java:91) ~[?:?] 
    at org.mongodb.morphia.mapping.DefaultCreator.createInstance(DefaultCreator.java:105) ~[?:?] 
    at org.mongodb.morphia.mapping.EmbeddedMapper.readMapOrCollectionOrEntity(EmbeddedMapper.java:209) ~[?:?] 
    at org.mongodb.morphia.mapping.EmbeddedMapper.readCollection(EmbeddedMapper.java:144) ~[?:?] 
    at org.mongodb.morphia.mapping.EmbeddedMapper.fromDBObject(EmbeddedMapper.java:47) ~[?:?] 
    at org.mongodb.morphia.mapping.Mapper.readMappedField(Mapper.java:850) ~[?:?] 
    at org.mongodb.morphia.mapping.Mapper.fromDb(Mapper.java:282) ~[?:?] 
    at org.mongodb.morphia.mapping.Mapper.fromDBObject(Mapper.java:193) ~[?:?] 
    at org.mongodb.morphia.query.MorphiaIterator.convertItem(MorphiaIterator.java:134) ~[?:?] 
    at org.mongodb.morphia.query.MorphiaIterator.processItem(MorphiaIterator.java:146) ~[?:?] 
    at org.mongodb.morphia.query.MorphiaIterator.next(MorphiaIterator.java:117) ~[?:?] 
    at org.mongodb.morphia.query.QueryImpl.get(QueryImpl.java:236) ~[?:?] 
    at org.mongodb.morphia.query.QueryImpl.get(QueryImpl.java:227) ~[?:?] 
    at org.mongodb.morphia.dao.BasicDAO.findOne(BasicDAO.java:178) ~[?:?] 
    at eu.unionmc.kitpvp.player.PlayerManager.get(PlayerManager.java:49) ~[?:?] 
    at eu.unionmc.kitpvp.commands.kitCommand.onCommand(kitCommand.java:31) ~[?:?] 
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spigot.jar:git-Spigot-550ebac-7019900]

プレーヤー - Morphiaエンティティ

@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); 
} 
}

キットのクラス

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クラス

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); 
} 

}

キットコマンドクラス

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; 
} 
}

出典

2017-08-17 Tomas Almeida