Morphia - Class 未在 dbObj 中找到定义
Morphia - Class not found defined in dbObj
我有一个相当有趣的问题。尝试从 Mongo 实例加载模型时，Morphia 抛出以下错误：
[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.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.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]
如您所见，我 运行 它在一个 Spigot 服务器中（本质上是一个具有适当 API 实现的 Minecraft 服务器）。我不确定这是否非常相关，但 Spigot 服务器以与 Morphia 类似的方式加载插件，所以我认为这可能是导致此问题的原因，因为之前有记录的 Morphia 实例与其他实例冲突使用 class 加载程序的库。
向@Entity 注释添加"noClassnameStored = true" 似乎可以防止此错误，但是我在数据库中存储了一个自定义对象列表，这也会导致此错误。
我使用的模型如下：
Stat.java:
package me.mattrick.test.storage;
public class Stat {
}
测试Stat.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;
}
应该注意的是，由于在@Entity 注释上设置了 "noClassnameStored = true" 参数，User class 可以正常保存和加载，但 Stat class 不会，因为这不可行。
有没有人碰巧知道这个问题的解决方案？这是一个相当奇怪的错误，而且我对 Morphia 不太了解。感谢您的帮助，很抱歉这么长post。
该错误通常源于损坏的类路径。看起来你的 spigot 服务器在启动时没有在类路径上包含你的实体的 jar。
我已经弄明白了。您需要用您的插件自己覆盖 Morphia 的 ClassLoader。如果有人使用 Spigot 或 Bukkit 正在寻找答案：
morphia.getMapper().getOptions().setObjectFactory(new DefaultCreator() {
@Override
protected ClassLoader getClassLoaderForClass() {
return JavaPlugin.getClassLoader();
}
});
对于在 2020 年遇到此问题（就像我一样）并使用 PaperSpigot 的任何人，以下是我在求助于 Morphia 的文档后设法做到的。我正在使用 Morphia v1.6.0 and PaperSpigot 1.16.2.
morphia.getMapper().setOptions(
MapperOptions.legacy().classLoader(<MainClass>.class.getClassLoader())
.build()
);
这里有一个解释：
- 已接受的答案表明您可以使用
.setObjectFactory to achieve this change. In my IDE (IntelliJ), it wasn't only marked as deprecated, but using that along with the DefaultCreator wasn't doing the job. I don't think it's accepted practice in the new version(s) of Morphia? Anyways, I ended up using the setOptions method using the legacy builder for setting MapperOptions。此方法也未弃用。
- 在接受的答案中，显示了
JavaPlugin.getClassLoader()的用法。该方法受到保护。因此您不能直接访问它。但是，如果您使用插件的主要 class，例如，您可以毫无问题地访问 getClassLoader() 方法。除非您尝试做一些 weird/hacky 事情，否则您不会想要直接访问这些方法。
我有一个相当有趣的问题。尝试从 Mongo 实例加载模型时，Morphia 抛出以下错误：
[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.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.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]
如您所见，我 运行 它在一个 Spigot 服务器中（本质上是一个具有适当 API 实现的 Minecraft 服务器）。我不确定这是否非常相关，但 Spigot 服务器以与 Morphia 类似的方式加载插件，所以我认为这可能是导致此问题的原因，因为之前有记录的 Morphia 实例与其他实例冲突使用 class 加载程序的库。
向@Entity 注释添加"noClassnameStored = true" 似乎可以防止此错误，但是我在数据库中存储了一个自定义对象列表，这也会导致此错误。
我使用的模型如下：
Stat.java:
package me.mattrick.test.storage;
public class Stat {
}
测试Stat.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;
}
应该注意的是，由于在@Entity 注释上设置了 "noClassnameStored = true" 参数，User class 可以正常保存和加载，但 Stat class 不会，因为这不可行。
有没有人碰巧知道这个问题的解决方案？这是一个相当奇怪的错误，而且我对 Morphia 不太了解。感谢您的帮助，很抱歉这么长post。
该错误通常源于损坏的类路径。看起来你的 spigot 服务器在启动时没有在类路径上包含你的实体的 jar。
我已经弄明白了。您需要用您的插件自己覆盖 Morphia 的 ClassLoader。如果有人使用 Spigot 或 Bukkit 正在寻找答案：
morphia.getMapper().getOptions().setObjectFactory(new DefaultCreator() {
@Override
protected ClassLoader getClassLoaderForClass() {
return JavaPlugin.getClassLoader();
}
});
对于在 2020 年遇到此问题（就像我一样）并使用 PaperSpigot 的任何人，以下是我在求助于 Morphia 的文档后设法做到的。我正在使用 Morphia v1.6.0 and PaperSpigot 1.16.2.
morphia.getMapper().setOptions(
MapperOptions.legacy().classLoader(<MainClass>.class.getClassLoader())
.build()
);
这里有一个解释：
- 已接受的答案表明您可以使用
.setObjectFactoryto achieve this change. In my IDE (IntelliJ), it wasn't only marked as deprecated, but using that along with theDefaultCreatorwasn't doing the job. I don't think it's accepted practice in the new version(s) of Morphia? Anyways, I ended up using thesetOptionsmethod using the legacy builder for settingMapperOptions。此方法也未弃用。 - 在接受的答案中，显示了
JavaPlugin.getClassLoader()的用法。该方法受到保护。因此您不能直接访问它。但是，如果您使用插件的主要 class，例如，您可以毫无问题地访问getClassLoader()方法。除非您尝试做一些 weird/hacky 事情，否则您不会想要直接访问这些方法。