Morphia - 未在dbObj中定義的類

Question

我有一個相當有趣的問題。當試圖從一個蒙戈實例加載模型，嗎啡引發以下錯誤：

[22:17:13 WARN]: Class not found defined in dbObj: 
java.lang.ClassNotFoundException: me.mattrick.test.storage.TestStat 
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[?:1.8.0_101] 
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_101] 
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) ~[?:1.8.0_101] 
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_101] 
    at java.lang.Class.forName0(Native Method) ~[?:1.8.0_101] 
    at java.lang.Class.forName(Class.java:348) ~[?:1.8.0_101] 
    at org.mongodb.morphia.mapping.DefaultCreator.getClass(DefaultCreator.java:175) [Test-1.5-SNAPSHOT-shaded.jar:?] 
    at org.mongodb.morphia.mapping.DefaultCreator.createInstance(DefaultCreator.java:97) [Test-1.5-SNAPSHOT-shaded.jar:?] 
    at org.mongodb.morphia.mapping.EmbeddedMapper.readMapOrCollectionOrEntity(EmbeddedMapper.java:205) [Test-1.5-SNAPSHOT-shaded.jar:?] 
    at org.mongodb.morphia.mapping.EmbeddedMapper.readCollection(EmbeddedMapper.java:142) [Test-1.5-SNAPSHOT-shaded.jar:?] 
    at org.mongodb.morphia.mapping.EmbeddedMapper.fromDBObject(EmbeddedMapper.java:45) [Test-1.5-SNAPSHOT-shaded.jar:?] 
    at org.mongodb.morphia.mapping.Mapper.readMappedField(Mapper.java:772) [Test-1.5-SNAPSHOT-shaded.jar:?] 
    at org.mongodb.morphia.mapping.Mapper.fromDb(Mapper.java:230) [Test-1.5-SNAPSHOT-shaded.jar:?] 
    at org.mongodb.morphia.mapping.Mapper.fromDBObject(Mapper.java:191) [Test-1.5-SNAPSHOT-shaded.jar:?] 
    at org.mongodb.morphia.query.MorphiaIterator.convertItem(MorphiaIterator.java:134) [Test-1.5-SNAPSHOT-shaded.jar:?] 
    at org.mongodb.morphia.query.MorphiaIterator.processItem(MorphiaIterator.java:146) [Test-1.5-SNAPSHOT-shaded.jar:?] 
    at org.mongodb.morphia.query.MorphiaIterator.next(MorphiaIterator.java:117) [Test-1.5-SNAPSHOT-shaded.jar:?] 
    at org.mongodb.morphia.query.QueryImpl.get(QueryImpl.java:220) [Test-1.5-SNAPSHOT-shaded.jar:?] 
    at org.mongodb.morphia.dao.BasicDAO.findOne(BasicDAO.java:180) [Test-1.5-SNAPSHOT-shaded.jar:?] 
    at me.mattrick.test.storage.UserRepository.getUserFromPlayer(UserRepository.java:22) [Test-1.5-SNAPSHOT-shaded.jar:?] 
    at me.mattrick.test.event.JoinEvent.onJoin(JoinEvent.java:37) [Test-1.5-SNAPSHOT-shaded.jar:?] 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_101] 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_101] 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_101] 
    at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_101] 
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) [spigot-1.8.8.jar:git-Spigot-e4d4710-e1ebe52] 
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) [spigot-1.8.8.jar:git-Spigot-e4d4710-e1ebe52] 
    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [spigot-1.8.8.jar:git-Spigot-e4d4710-e1ebe52] 
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [spigot-1.8.8.jar:git-Spigot-e4d4710-e1ebe52] 
    at net.minecraft.server.v1_8_R3.PlayerList.onPlayerJoin(PlayerList.java:298) [spigot-1.8.8.jar:git-Spigot-e4d4710-e1ebe52] 
    at net.minecraft.server.v1_8_R3.PlayerList.a(PlayerList.java:157) [spigot-1.8.8.jar:git-Spigot-e4d4710-e1ebe52] 
    at net.minecraft.server.v1_8_R3.LoginListener.b(LoginListener.java:144) [spigot-1.8.8.jar:git-Spigot-e4d4710-e1ebe52] 
    at net.minecraft.server.v1_8_R3.LoginListener.c(LoginListener.java:54) [spigot-1.8.8.jar:git-Spigot-e4d4710-e1ebe52] 
    at net.minecraft.server.v1_8_R3.NetworkManager.a(NetworkManager.java:231) [spigot-1.8.8.jar:git-Spigot-e4d4710-e1ebe52] 
    at net.minecraft.server.v1_8_R3.ServerConnection.c(ServerConnection.java:148) [spigot-1.8.8.jar:git-Spigot-e4d4710-e1ebe52] 
    at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:814) [spigot-1.8.8.jar:git-Spigot-e4d4710-e1ebe52] 
    at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [spigot-1.8.8.jar:git-Spigot-e4d4710-e1ebe52] 
    at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654) [spigot-1.8.8.jar:git-Spigot-e4d4710-e1ebe52] 
    at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557) [spigot-1.8.8.jar:git-Spigot-e4d4710-e1ebe52] 
    at java.lang.Thread.run(Thread.java:745) [?:1.8.0_101] 
[22:17:13 WARN]: Class not found defined in dbObj: 
java.lang.ClassNotFoundException: me.mattrick.test.storage.TestStat 
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[?:1.8.0_101] 
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_101] 
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) ~[?:1.8.0_101] 
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_101] 
    at java.lang.Class.forName0(Native Method) ~[?:1.8.0_101] 
    at java.lang.Class.forName(Class.java:348) ~[?:1.8.0_101] 
    at org.mongodb.morphia.mapping.DefaultCreator.getClass(DefaultCreator.java:175) [Test-1.5-SNAPSHOT-shaded.jar:?] 
    at org.mongodb.morphia.mapping.DefaultCreator.createInstance(DefaultCreator.java:87) [Test-1.5-SNAPSHOT-shaded.jar:?] 
    at org.mongodb.morphia.mapping.DefaultCreator.createInstance(DefaultCreator.java:102) [Test-1.5-SNAPSHOT-shaded.jar:?] 
    at org.mongodb.morphia.mapping.EmbeddedMapper.readMapOrCollectionOrEntity(EmbeddedMapper.java:205) [Test-1.5-SNAPSHOT-shaded.jar:?] 
    at org.mongodb.morphia.mapping.EmbeddedMapper.readCollection(EmbeddedMapper.java:142) [Test-1.5-SNAPSHOT-shaded.jar:?] 
    at org.mongodb.morphia.mapping.EmbeddedMapper.fromDBObject(EmbeddedMapper.java:45) [Test-1.5-SNAPSHOT-shaded.jar:?] 
    at org.mongodb.morphia.mapping.Mapper.readMappedField(Mapper.java:772) [Test-1.5-SNAPSHOT-shaded.jar:?] 
    at org.mongodb.morphia.mapping.Mapper.fromDb(Mapper.java:230) [Test-1.5-SNAPSHOT-shaded.jar:?] 
    at org.mongodb.morphia.mapping.Mapper.fromDBObject(Mapper.java:191) [Test-1.5-SNAPSHOT-shaded.jar:?] 
    at org.mongodb.morphia.query.MorphiaIterator.convertItem(MorphiaIterator.java:134) [Test-1.5-SNAPSHOT-shaded.jar:?] 
    at org.mongodb.morphia.query.MorphiaIterator.processItem(MorphiaIterator.java:146) [Test-1.5-SNAPSHOT-shaded.jar:?] 
    at org.mongodb.morphia.query.MorphiaIterator.next(MorphiaIterator.java:117) [Test-1.5-SNAPSHOT-shaded.jar:?] 
    at org.mongodb.morphia.query.QueryImpl.get(QueryImpl.java:220) [Test-1.5-SNAPSHOT-shaded.jar:?] 
    at org.mongodb.morphia.dao.BasicDAO.findOne(BasicDAO.java:180) [Test-1.5-SNAPSHOT-shaded.jar:?] 
    at me.mattrick.test.storage.UserRepository.getUserFromPlayer(UserRepository.java:22) [Test-1.5-SNAPSHOT-shaded.jar:?] 
    at me.mattrick.test.event.JoinEvent.onJoin(JoinEvent.java:37) [Test-1.5-SNAPSHOT-shaded.jar:?] 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_101] 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_101] 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_101] 
    at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_101] 
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) [spigot-1.8.8.jar:git-Spigot-e4d4710-e1ebe52] 
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) [spigot-1.8.8.jar:git-Spigot-e4d4710-e1ebe52] 
    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [spigot-1.8.8.jar:git-Spigot-e4d4710-e1ebe52] 
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [spigot-1.8.8.jar:git-Spigot-e4d4710-e1ebe52] 
    at net.minecraft.server.v1_8_R3.PlayerList.onPlayerJoin(PlayerList.java:298) [spigot-1.8.8.jar:git-Spigot-e4d4710-e1ebe52] 
    at net.minecraft.server.v1_8_R3.PlayerList.a(PlayerList.java:157) [spigot-1.8.8.jar:git-Spigot-e4d4710-e1ebe52] 
    at net.minecraft.server.v1_8_R3.LoginListener.b(LoginListener.java:144) [spigot-1.8.8.jar:git-Spigot-e4d4710-e1ebe52] 
    at net.minecraft.server.v1_8_R3.LoginListener.c(LoginListener.java:54) [spigot-1.8.8.jar:git-Spigot-e4d4710-e1ebe52] 
    at net.minecraft.server.v1_8_R3.NetworkManager.a(NetworkManager.java:231) [spigot-1.8.8.jar:git-Spigot-e4d4710-e1ebe52] 
    at net.minecraft.server.v1_8_R3.ServerConnection.c(ServerConnection.java:148) [spigot-1.8.8.jar:git-Spigot-e4d4710-e1ebe52] 
    at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:814) [spigot-1.8.8.jar:git-Spigot-e4d4710-e1ebe52] 
    at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [spigot-1.8.8.jar:git-Spigot-e4d4710-e1ebe52] 
    at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654) [spigot-1.8.8.jar:git-Spigot-e4d4710-e1ebe52] 
    at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557) [spigot-1.8.8.jar:git-Spigot-e4d4710-e1ebe52] 
    at java.lang.Thread.run(Thread.java:745) [?:1.8.0_101] 

正如你所看到的，我跑這一個插口服務器內（這基本上是一個的Minecraft服務器具有適當的API實現） 。我不確定這是否非常相關，但Spigot服務器以類似於Morphia的方式加載插件，所以我認爲這可能會導致這個問題，因爲之前有記載的Morphia實例與其他實例衝突使用類加載器的庫。

在@Entity註解中添加「noClassnameStored = true」似乎可以防止這個錯誤，但是我在數據庫中存儲了一個自定義對象列表，這也導致了這個錯誤。

我使用的模型可以在下面看到：

Stat.java：

package me.mattrick.test.storage; 

public class Stat { 
} 

TestStat.java：

package me.mattrick.test.storage; 

import lombok.Getter; 
import lombok.Setter; 

public class TestStat extends Stat { 

    @Getter @Setter 
    private int test = 100; 

} 

User.java：

package me.mattrick.test.storage; 

import lombok.Getter; 
import lombok.Setter; 
import me.mattrick.test.Test; 
import me.mattrick.test.api.storage.mongo.MongoEntity; 
import me.mattrick.test.cosmetics.particles.EnumParticleEffect; 
import me.mattrick.test.player.PlayerRank; 
import org.bukkit.Bukkit; 
import org.bukkit.entity.Player; 
import org.mongodb.morphia.annotations.Entity; 

import java.time.LocalDateTime; 
import java.util.ArrayList; 
import java.util.List; 
import java.util.UUID; 

@Entity(value = "users", noClassnameStored = true) 
public class User extends MongoEntity { 

    @Getter @Setter 
    private UUID uuid; 

    @Getter @Setter 
    private PlayerRank rank = PlayerRank.DEFAULT; 

    @Getter @Setter 
    private EnumParticleEffect effect = EnumParticleEffect.NONE; 

    @Getter @Setter 
    private int money = 0; 

    @Getter @Setter 
    private int level = 0; 

    @Getter @Setter 
    private long experience = 0; 

    @Getter @Setter 
    private LocalDateTime firstJoined; 

    @Getter @Setter 
    private LocalDateTime lastPlayed; 

    @Getter @Setter 
    private List<Stat> stats = new ArrayList<>(); 

    public Player getPlayer() { 
     return Bukkit.getPlayer(uuid); 
    } 

    public void save() { 
     Test.getInstance().getMongoBridge().repositoryBy(User.class).save(this); 
    } 

    public <T extends Stat> T getStat(Class<T> statClass) { 
     for (Stat stat : stats) { 
      if(stat.getClass() == statClass) { 
       return statClass.cast(stat); 
      } 
     } 
     return null; 
    } 

    public void addStat(Stat stat) { 
     stats.add(stat); 
    } 

} 

MongoEntity.java：

package me.mattrick.test.api.storage.mongo; 

import lombok.Getter; 
import lombok.Setter; 
import org.bson.types.ObjectId; 
import org.mongodb.morphia.annotations.Id; 

public class MongoEntity { 

    @Id 
    @Getter @Setter 
    private ObjectId id; 

} 

應當注意的是，用戶級的撲救，並加載罰款作爲「noClassnameStored =真正的」參數上@Entity批註設置的結果，但統計類不，因爲這是不是可行這個。

會有人碰巧知道這個解決方案嗎？這是一個相當奇怪的錯誤，我對Morphia沒有太多經驗。感謝您爲這麼長的帖子提供幫助和道歉。

Answer 1

我設法弄明白了。你需要用你自己的插件覆蓋Morphia的ClassLoader。如果使用插口或Bukkit人都在尋找答案：

morphia.getMapper().getOptions().setObjectFactory(new DefaultCreator() { 
    @Override 
    protected ClassLoader getClassLoaderForClass() { 
     return JavaPlugin.getClassLoader(); 
    } 
}); 

Answer 2

該錯誤通常源於破碎的類路徑。看來你的spigot服務器在啓動時並沒有在你的類路徑中包含jar實體。