为什么 Ebean 无法识别非原始 @Transient 成员变量？

【问题标题】：Why is Ebean not recognising a non-primitive @Transient member variable?为什么 Ebean 无法识别非原始 @Transient 成员变量？
【发布时间】：2017-04-07 23:51:45
【问题描述】：

我想从 Ebean 持久性中排除 items。

这是我的豆子：

package entity;

import java.util.Date;

import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.persistence.Transient;

import com.avaje.ebean.validation.Length;
import com.avaje.ebean.validation.NotNull;

@Entity()
@Table(name="profile")
public class Profile {

    private Item[] items;

    @Transient
    public Item[] getItems() {
        return items;
    }

    public void setItems(Item[] items) {
        this.items = items;
    }

    @Id
    private int id;

    @Length(max=50)
    @NotNull
    private String externalReference;

    ...

但我得到以下堆栈跟踪：

[20:16:18] [Server thread/ERROR]: Was unable to use reflection to find a constructor and appropriate getters forimmutable type class [Lentity.Item;.  The errors while looking for the getter methods follow:
[20:16:18] [Server thread/ERROR]: Error with entity.Profile field:items
java.lang.RuntimeException: Unable to use reflection to build ImmutableMeta for class [Lentity.Item;.  Associated Errors trying to find a constructor and getter methods have been logged
        at com.avaje.ebeaninternal.server.type.reflect.ImmutableMetaFactory.createImmutableMeta(ImmutableMetaFactory.java:71) ~[craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at com.avaje.ebeaninternal.server.type.DefaultTypeManager.recursiveCreateScalarTypes(DefaultTypeManager.java:224) ~[craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at com.avaje.ebeaninternal.server.deploy.parse.DeployCreateProperties.createProp(DeployCreateProperties.java:367) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at com.avaje.ebeaninternal.server.deploy.parse.DeployCreateProperties.createProp(DeployCreateProperties.java:387) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at com.avaje.ebeaninternal.server.deploy.parse.DeployCreateProperties.createProperties(DeployCreateProperties.java:168) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at com.avaje.ebeaninternal.server.deploy.parse.DeployCreateProperties.createProperties(DeployCreateProperties.java:94) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at com.avaje.ebeaninternal.server.deploy.BeanDescriptorManager.createDeployBeanInfo(BeanDescriptorManager.java:1041) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at com.avaje.ebeaninternal.server.deploy.BeanDescriptorManager.readEntityDeploymentInitial(BeanDescriptorManager.java:552) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at com.avaje.ebeaninternal.server.deploy.BeanDescriptorManager.deploy(BeanDescriptorManager.java:269) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at com.avaje.ebeaninternal.server.core.InternalConfiguration.<init>(InternalConfiguration.java:143) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at com.avaje.ebeaninternal.server.core.DefaultServerFactory.createServer(DefaultServerFactory.java:209) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at com.avaje.ebeaninternal.server.core.DefaultServerFactory.createServer(DefaultServerFactory.java:63) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at com.avaje.ebean.EbeanServerFactory.create(EbeanServerFactory.java:78) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at org.bukkit.plugin.java.JavaPlugin.init(JavaPlugin.java:344) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at org.bukkit.plugin.java.PluginClassLoader.initialize(PluginClassLoader.java:104) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at org.bukkit.plugin.java.JavaPlugin.<init>(JavaPlugin.java:67) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at profile.ProfilePlugin.<init>(ProfilePlugin.java:16) [crm-profile.jar:?]
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) [?:1.7.0_45]
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57) [?:1.7.0_45]
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) [?:1.7.0_45]
        at java.lang.reflect.Constructor.newInstance(Constructor.java:526) [?:1.7.0_45]
        at java.lang.Class.newInstance(Class.java:374) [?:1.7.0_45]
        at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:52) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:129) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:328) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:251) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at org.bukkit.craftbukkit.v1_10_R1.CraftServer.loadPlugins(CraftServer.java:294) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at org.bukkit.craftbukkit.v1_10_R1.CraftServer.reload(CraftServer.java:723) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at org.bukkit.Bukkit.reload(Bukkit.java:548) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:25) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:140) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at org.bukkit.craftbukkit.v1_10_R1.CraftServer.dispatchCommand(CraftServer.java:625) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at net.minecraft.server.v1_10_R1.PlayerConnection.handleCommand(PlayerConnection.java:1299) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at net.minecraft.server.v1_10_R1.PlayerConnection.a(PlayerConnection.java:1159) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at net.minecraft.server.v1_10_R1.PacketPlayInChat.a(SourceFile:37) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at net.minecraft.server.v1_10_R1.PacketPlayInChat.a(SourceFile:9) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at net.minecraft.server.v1_10_R1.PlayerConnectionUtils$1.run(SourceFile:13) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) [?:1.7.0_45]
        at java.util.concurrent.FutureTask.run(FutureTask.java:262) [?:1.7.0_45]
        at net.minecraft.server.v1_10_R1.SystemUtils.a(SourceFile:45) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at net.minecraft.server.v1_10_R1.MinecraftServer.D(MinecraftServer.java:690) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at net.minecraft.server.v1_10_R1.DedicatedServer.D(DedicatedServer.java:360) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at net.minecraft.server.v1_10_R1.MinecraftServer.C(MinecraftServer.java:646) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at net.minecraft.server.v1_10_R1.MinecraftServer.run(MinecraftServer.java:550) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at java.lang.Thread.run(Thread.java:744) [?:1.7.0_45]
[20:16:18] [Server thread/ERROR]: Error in deployment
javax.persistence.PersistenceException: Error with [entity.Profile] I believe it is not enhanced but it's superClass [class java.lang.Object] is? (You are not allowed to mix enhancement in a single inheritance hierarchy)
        at com.avaje.ebeaninternal.server.deploy.BeanDescriptorManager.setBeanReflect(BeanDescriptorManager.java:1393) ~[craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at com.avaje.ebeaninternal.server.deploy.BeanDescriptorManager.createByteCode(BeanDescriptorManager.java:1161) ~[craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at com.avaje.ebeaninternal.server.deploy.BeanDescriptorManager.readDeployAssociations(BeanDescriptorManager.java:1077) ~[craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at com.avaje.ebeaninternal.server.deploy.BeanDescriptorManager.readEntityDeploymentAssociations(BeanDescriptorManager.java:584) ~[craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at com.avaje.ebeaninternal.server.deploy.BeanDescriptorManager.deploy(BeanDescriptorManager.java:271) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at com.avaje.ebeaninternal.server.core.InternalConfiguration.<init>(InternalConfiguration.java:143) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at com.avaje.ebeaninternal.server.core.DefaultServerFactory.createServer(DefaultServerFactory.java:209) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at com.avaje.ebeaninternal.server.core.DefaultServerFactory.createServer(DefaultServerFactory.java:63) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at com.avaje.ebean.EbeanServerFactory.create(EbeanServerFactory.java:78) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at org.bukkit.plugin.java.JavaPlugin.init(JavaPlugin.java:344) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at org.bukkit.plugin.java.PluginClassLoader.initialize(PluginClassLoader.java:104) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at org.bukkit.plugin.java.JavaPlugin.<init>(JavaPlugin.java:67) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at profile.ProfilePlugin.<init>(ProfilePlugin.java:16) [crm-profile.jar:?]
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) [?:1.7.0_45]
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57) [?:1.7.0_45]
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) [?:1.7.0_45]
        at java.lang.reflect.Constructor.newInstance(Constructor.java:526) [?:1.7.0_45]
        at java.lang.Class.newInstance(Class.java:374) [?:1.7.0_45]
        at org.bukkit.plugin.java.PluginClassLoader.<init>(PluginClassLoader.java:52) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:129) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:328) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:251) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at org.bukkit.craftbukkit.v1_10_R1.CraftServer.loadPlugins(CraftServer.java:294) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at org.bukkit.craftbukkit.v1_10_R1.CraftServer.reload(CraftServer.java:723) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at org.bukkit.Bukkit.reload(Bukkit.java:548) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:25) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:140) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at org.bukkit.craftbukkit.v1_10_R1.CraftServer.dispatchCommand(CraftServer.java:625) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at net.minecraft.server.v1_10_R1.PlayerConnection.handleCommand(PlayerConnection.java:1299) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at net.minecraft.server.v1_10_R1.PlayerConnection.a(PlayerConnection.java:1159) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at net.minecraft.server.v1_10_R1.PacketPlayInChat.a(SourceFile:37) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at net.minecraft.server.v1_10_R1.PacketPlayInChat.a(SourceFile:9) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at net.minecraft.server.v1_10_R1.PlayerConnectionUtils$1.run(SourceFile:13) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) [?:1.7.0_45]
        at java.util.concurrent.FutureTask.run(FutureTask.java:262) [?:1.7.0_45]
        at net.minecraft.server.v1_10_R1.SystemUtils.a(SourceFile:45) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at net.minecraft.server.v1_10_R1.MinecraftServer.D(MinecraftServer.java:690) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at net.minecraft.server.v1_10_R1.DedicatedServer.D(DedicatedServer.java:360) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at net.minecraft.server.v1_10_R1.MinecraftServer.C(MinecraftServer.java:646) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at net.minecraft.server.v1_10_R1.MinecraftServer.run(MinecraftServer.java:550) [craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at java.lang.Thread.run(Thread.java:744) [?:1.7.0_45]
Caused by: java.lang.IllegalArgumentException: field [items] not found in [entity.Profile$$EntityBean$crm-profile][id, externalReference, playerId, location, clan, playerClass, visible, deleted, health, level, pvpKills, pvpDeaths, mobKills, mobDeaths, onlineDuration, durationSinceLastDeath, lastUpdated, lastDeathDurationCheck]
        at com.avaje.ebeaninternal.server.reflect.EnhanceBeanReflect.getFieldIndex(EnhanceBeanReflect.java:139) ~[craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at com.avaje.ebeaninternal.server.reflect.EnhanceBeanReflect.getGetter(EnhanceBeanReflect.java:143) ~[craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        at com.avaje.ebeaninternal.server.deploy.BeanDescriptorManager.setBeanReflect(BeanDescriptorManager.java:1377) ~[craftbukkit-1.10.2.jar:git-Bukkit-0ebb9c7]
        ... 40 more

有人能告诉我如何正确地将成员变量items 声明为@Transient 以便将其排除在持久性之外吗？

【问题讨论】：

    标签： java persistence ebean transient


    【解决方案1】：

    要解决此问题，您需要将@Transient 注释应用于字段items（而不是getItems()），如下所示：

    @Entity()
@Table(name="profile")
public class Profile {

  @Id
  private int id;

  @Transient
  private Item[] items;

  public Item[] getItems() {
    return items;
  }

   ...
}

    P.S.：当您有 @Transient 字段时，请确保您在 getter 方法或字段上一致地放置 JPA 注释，而不是在两个地方都分布它们。在您当前的代码中，其他 JPA 注释（如 @Id）已标记为除 @Transient 之外的字段。

    它可以解决问题，但是我在 JPA 规范或 Hibernate 上找不到任何东西。

    【讨论】：

    • 不幸的是，这不是我的解决方案。您知道您使用的是哪个版本的 Ebean 吗？我在 Ebean 上发现了这个错误，并且显然已在 4.0.1 版中修复：github.com/ebean-orm/ebean/issues/11。目前还不清楚 Ebean Minecraftcraftbukkit 1.10.2 使用什么版本（我猜是旧版本..）。
    • 我在您分享的问题链接上找不到与 Transient 相关的任何内容
    • 抱歉，我修复了链接：github.com/ebean-orm/ebean/issues/111
    【解决方案2】：

    这是 4.0.1 之前的 EBean 版本中的错误。解决方法是：

    1. 将属性更改为 List 或 Set 而不是数组。

    2. 如果可能，也将字段标记为“transient”，即如果您不需要在该字段上使用 Java 序列化。

    正如相关bug report中所述。

    【讨论】：

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