那些遇到过的问题

Morphia - 未在dbObj中定义的类

mat*_*ick 1 java mongodb morphia

我有一个相当有趣的问题.尝试从Mongo实例加载模型时,Morphia会抛出以下错误:

[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$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]
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正如您所看到的,我在Spigot服务器(它本质上是具有适当API实现的Minecraft服务器)内运行它.我不确定这是否非常相关,但是Spigot服务器以与Morphia类似的方式加载插件,所以我认为这可能导致这个问题,因为之前有过记录的Morphia实例与其他实例冲突使用类加载器的库.

在@Entity注释中添加"noClassnameStored = true"似乎可以防止此错误,但是我在数据库中存储自定义对象列表,这也会导致此错误.

我正在使用的模型如下所示:

Stat.java:

package me.mattrick.test.storage;

public class Stat {
}
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TestStat.java:

package me.mattrick.test.storage;

import lombok.Getter;
import lombok.Setter;

public class TestStat extends Stat {

    @Getter @Setter
    private int test = 100;

}
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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);
    }

}
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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;

}
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应该注意的是,由于@Entity注释上设置了"noClassnameStored = true"参数,User类保存并加载正常,但Stat类没有,因为这对此不可行.

有人会碰巧知道解决方案吗？这是一个相当奇怪的错误,我对Morphia并不太熟悉.谢谢你的帮助,并为这么长的帖子道歉.

mat*_*ick 6

我已经成功解决了这个问题.你需要用自己的插件覆盖Morphia的ClassLoader.如果有人使用Spigot或Bukkit寻找答案:

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