Hibernate：无法加载在Hibernate配置中声明的类< mapping />条目 [英] Hibernate: Unable to load class declared in Hibernate configuration <mapping/> entry

问题描述

我在Hibernate中是全新的，并且有这样一个堆栈跟踪：

  hql> from TracksEntity 
 [2014-04-26 21:13:45] org.hibernate.MappingException：无法加载在Hibernate配置中声明的类[model.TracksEntity]< mapping />入门
 [2014-04-26 21:13:45] java.lang.ClassNotFoundException：model.TracksEntity $ b $ java.net.URLClassLoader $ 1.run（URLClassLoader.java:372）
在java.net.URLClassLoader $ 1.run（URLClassLoader.java:361）$ java.util.AccessController.doPrivileged（本地方法）
在java.net.URLClassLoader.findClass 
（URLClassLoader.java:360 ）
 at java.lang.ClassLoader.loadClass（ClassLoader.java:424）
 at sun.misc.Launcher $ AppClassLoader.loadClass（Launcher.java:308）
 at java.lang。 ClassLoader.loadClass（ClassLoader.java:357）$ b $在java.lang.Class.forName0（本地方法）
在java.lang.Class.forName（Class.java:259）
 at org.hibernate.internal.util.ReflectHelper.classForName（ReflectHelper.java:192）
在org.hibernate.cfg.Configuration.parseMappingElement（Configuration.java:2188）
在org.hibernate.cfg。 Configuration.parseSessionFactory（Configuration.java:2139）
在org.hibernate.cfg.Configuration.doConfigure（Con 
 at org.hibernate.cfg.Configuration.doConfigure（Configuration.java:2072）
 at org.hibernate.cfg.Configuration.configure（Configuration.java:2045）
 at sun.reflect.NativeMethodAccessorImpl.invoke0（Native Method）
 at sun.reflect.NativeMethodAccessorImpl。调用（NativeMethodAccessorImpl.java:62）
 at sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）
 at java.lang.reflect.Method.invoke（Method.java:483）
在sun.rmi.server.UnicastServerRef.dispatch（UnicastServerRef.java:323）
在sun.rmi.transport.Transport $ 1.run（Transport.java:178）
在sun.rmi。 transport.Transport $ 1.run（Transport.java:175）
 at java.security.AccessController.doPrivileged（Native Method）
 at sun.rmi.transport.Transport.serviceCall（Transport.java:174） 
在sun.rmi.transport.tc p.TCPTransport.handleMessages（TCPTransport.java:557）
 at sun.rmi.transport.tcp.TCPTransport $ ConnectionHandler.run0（TCPTransport.java:812）
 at sun.rmi.transport.tcp。 TCPTransport $ ConnectionHandler.run（TCPTransport.java:671）$ b $在java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1142）
在java.util.concurrent.ThreadPoolExecutor $ Worker.run（ ThreadPoolExecutor.java:617）
 at java.lang.Thread.run（Thread.java:744）
  

我的hibernate.cfg.xml和TracksEntity.java是由Intellij Idea自动生成的：

TracksEntity.java：
包模型;

  import javax.persistence。*; 
 
 @Entity 
 @Table（name =TRACKS，schema =APP，catalog =）
 public class TracksEntity {
 private int id; 
私人字符串艺术家; 
 private int duration; 
私有字符串标题; 
私人字符串网址; 
 
 @Id 
 @Column（name =ID）
 public int getId（）{
 return id; 
} 
 
 public void setId（int id）{
 this.id = id; 
} 
 
 @Basic 
 @Column（name =ARTIST）
 public String getArtist（）{
 return artist; 
} 
 
 public void setArtist（String artist）{
 this.artist = artist; 
} 
 
 @Basic 
 @Column（name =DURATION）
 public int getDuration（）{
 return duration; 
} 
 
 public void setDuration（int duration）{
 this.duration = duration; 
} 
 
 @Basic 
 @Column（name =TITLE）
 public String getTitle（）{
 return title; 
} 
 
 public void setTitle（String title）{
 this.title = title; 
} 
 
 @Basic 
 @Column（name =URL）
 public String getUrl（）{
 return url; 
} 
 
 public void setUrl（String url）{
 this.url = url; 
} 
 
 @Override 
 public boolean equals（Object o）{
 if（this == o）return true; 
 if（o == null || getClass（）！= o.getClass（））return false; 
 
 TracksEntity that =（TracksEntity）o; 
 
 if（duration！= that.duration）return false; 
 if（id！= that.id）return false; 
 if（artist！= null？！artist.equals（that.artist）：that.artist！= null）return false; 
 if（title！= null？！title.equals（that.title）：that.title！= null）return false; 
 if（url！= null？！url.equals（that.url）：that.url！= null）return false; 
 
返回true; 
} 
 
 @Override 
 public int hashCode（）{
 int result = id; 
 result = 31 * result +（artist！= null？artist.hashCode（）：0）; 
结果= 31 *结果+持续时间; 
 result = 31 * result +（title！= null？title.hashCode（）：0）; 
 result = 31 * result +（url！= null？url.hashCode（）：0）; 
返回结果; 
 
 
  

hibernate.cfg.xml：

 <？xml version ='1.0'encoding ='utf-8'？> 
<！DOCTYPE hibernate-configuration PUBLIC 
 -  // Hibernate / Hibernate Configuration DTD // EN
http://www.hibernate.org/dtd/hibernate-configuration- 3.0.dtd> 
< hibernate-configuration> 
< session-factory> 
< property name =connection.url> jdbc：derby：/ home / zimy / Documents / drbdb; create = true; create = true< / property> 
< property name =connection.driver_class> org.apache.derby.jdbc.EmbeddedDriver< / property> 
< mapping class =model.TracksEntity/> 
< / session-factory> 
< / hibernate-configuration> 
  

问题是什么？我发现它没有找到，但为什么？

解决方案

听起来很愚蠢，但我把我的实体类放在一个包中是不是我放在映射..和hibernate当然无法找到它...仅供参考..也许重新检查可以解决您的问题最好的问候。

I am completely new in Hibernate and got such an stacktrace:

hql> from TracksEntity 
[2014-04-26 21:13:45] org.hibernate.MappingException: Unable to load class [ model.TracksEntity] declared in Hibernate configuration <mapping/> entry
[2014-04-26 21:13:45] java.lang.ClassNotFoundException: model.TracksEntity
    at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:259)
    at org.hibernate.internal.util.ReflectHelper.classForName(ReflectHelper.java:192)
    at org.hibernate.cfg.Configuration.parseMappingElement(Configuration.java:2188)
    at org.hibernate.cfg.Configuration.parseSessionFactory(Configuration.java:2139)
    at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:2119)
    at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:2072)
    at org.hibernate.cfg.Configuration.configure(Configuration.java:2045)
    at com.intellij.hibernate.remote.impl.RemoteConfigurationImpl.configure(RemoteConfigurationImpl.java:57)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:323)
    at sun.rmi.transport.Transport$1.run(Transport.java:178)
    at sun.rmi.transport.Transport$1.run(Transport.java:175)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.Transport.serviceCall(Transport.java:174)
    at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:557)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:812)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:671)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:744)

My hibernate.cfg.xml and TracksEntity.java was automatically generated by Intellij Idea:

TracksEntity.java: package model;

import javax.persistence.*;

@Entity
@Table(name = "TRACKS", schema = "APP", catalog = "")
public class TracksEntity {
    private int id;
    private String artist;
    private int duration;
    private String title;
    private String url;

    @Id
    @Column(name = "ID")
    public int getId () {
        return id;
    }

    public void setId (int id) {
        this.id = id;
    }

    @Basic
    @Column(name = "ARTIST")
    public String getArtist () {
        return artist;
    }

    public void setArtist (String artist) {
        this.artist = artist;
    }

    @Basic
    @Column(name = "DURATION")
    public int getDuration () {
        return duration;
    }

    public void setDuration (int duration) {
        this.duration = duration;
    }

    @Basic
    @Column(name = "TITLE")
    public String getTitle () {
        return title;
    }

    public void setTitle (String title) {
        this.title = title;
    }

    @Basic
    @Column(name = "URL")
    public String getUrl () {
        return url;
    }

    public void setUrl (String url) {
        this.url = url;
    }

    @Override
    public boolean equals (Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        TracksEntity that = (TracksEntity) o;

        if (duration != that.duration) return false;
        if (id != that.id) return false;
        if (artist != null ? !artist.equals(that.artist) : that.artist != null) return false;
        if (title != null ? !title.equals(that.title) : that.title != null) return false;
        if (url != null ? !url.equals(that.url) : that.url != null) return false;

        return true;
    }

    @Override
    public int hashCode () {
        int result = id;
        result = 31 * result + (artist != null ? artist.hashCode() : 0);
        result = 31 * result + duration;
        result = 31 * result + (title != null ? title.hashCode() : 0);
        result = 31 * result + (url != null ? url.hashCode() : 0);
        return result;
    }
}

hibernate.cfg.xml:

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
    "-//Hibernate/Hibernate Configuration DTD//EN"
    "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>
        <property name="connection.url">jdbc:derby:/home/zimy/Documents/drbdb;create=true;create=true</property>
        <property name="connection.driver_class">org.apache.derby.jdbc.EmbeddedDriver</property>
        <mapping class="model.TracksEntity"/>
    </session-factory>
</hibernate-configuration>

What the problem is? I see that it is not found, but why?

解决方案

Sounds quite silly but i was putting my entity Class in a package which is not the same i put in the mapping.. and hibernate of course could not find it... just for reference.. maybe a recheck can solve your problem best regards.

这篇关于Hibernate：无法加载在Hibernate配置中声明的类< mapping />条目的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！