获取org.hibernate.MappingException：未知实体： [英] Getting org.hibernate.MappingException: Unknown entity:

问题描述

是的，我在各地都看到过这个问题，但我仍然无法弄清楚我的代码有什么问题。当然，我正在俯视一些东西，不能只告诉一下。

这是我的POJO。

 包hibernate; 
 
 public class User {
 private int id; 
私人字符串名称; 
 private int total; 
 private int goal; 
 
 public int getId（）{
 return id; 
} 
 public void setId（int id）{
 this.id = id; 
} 
 public String getName（）{
 return name; 
} 
 public void setName（String name）{
 this.name = name; 
} 
 public int getTotal（）{
 return total; 
} 
 public void setTotal（int total）{
 this.total = total; 
} 
 public int getGoal（）{
 return goal; 
} 
 public void setGoal（int goal）{
 this.goal = goal; 
 
 
  

以下是我的hibernate.cfg.xml

 <？xml version =1.0encoding =UTF-8？> 
<！DOCTYPE hibernate-configuration PUBLIC -  // Hibernate / Hibernate配置DTD 3.0 // EN
http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd > 
< hibernate-configuration> 
< session-factory name => 
< property name =hibernate.connection.driver_class> com.microsoft.sqlserver.jdbc.SQLServerDriver< / property> 
< property name =hibernate.connection.url> jdbc：sqlserver：// localhost：1433; DatabaseName = test;< / property> 
< property name =hibernate.dialect> org.hibernate.dialect.SQLServerDialect< / property> 
< property name =hibernate.connection.username> sa< / property> 
< property name =hibernate.connection.password> admin< / property> 
 
< mapping resource =hibernate / User.hbm.xml/> 
< / session-factory> 
< / hibernate-configuration> 
  

这是我的User.hbm.xml

 <？xml version =1.0？> 
<！DOCTYPE hibernate-mapping PUBLIC -  // Hibernate / Hibernate映射DTD 3.0 // EN
http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd\"> ; 
 <！ - 生成2016年1月18日上午12:10:00由Hibernate Tools 3.5.0.Final  - > 
< hibernate-mapping> 
< class name =hibernate.Usertable =USER> 
< id name =idtype =int> 
< column name =ID/> 
< generator class =native/> 
< / id> 
< property name =nametype =java.lang.String> 
< column name =NAME/> 
< / property> 
< property name =totaltype =int> 
< column name =TOTAL/> 
< / property> 
< property name =goaltype =int> 
< column name =GOAL/> 
< / property> 
< / class> 
< / hibernate-mapping> 
  

以下是主要应用程序将上述内容放在一起：

  package hibernate; 
 
 import org.hibernate.Session; 
 import org.hibernate.SessionFactory; 
 import org.hibernate.boot.registry.StandardServiceRegistryBuilder; 
导入org.hibernate.cfg.Configuration; 
 import org.hibernate.service.ServiceRegistry; 
 
 public class App {
 
 private static SessionFactory sessionFactory; 
 private static ServiceRegistry serviceRegistry; 
 
 public static void main（String [] args）{
 Configuration configuration = new Configuration（）。configure（）; 
 serviceRegistry = new StandardServiceRegistryBuilder（）
 .applySettings（configuration.getProperties（））。build（）; 
 
 sessionFactory = configuration.buildSessionFactory（serviceRegistry）; 
 
会话会话= sessionFactory.openSession（）; 
 session.beginTransaction（）; 
 
 User user = new User（）; 
 user.setName（Joe）; 
 user.setGoal（250）; 
 session.save（user）; 
 
 session.getTransaction（）。commit（）; 
 session.close（）; 
 HibernateUtility.getSessionFactory（）。close（）; 
 
 
 $ / code $ / pre 
 
 
当我运行上面的代码时， 。
  2016年1月18日上午9:34:04 org.hibernate.dialect.Dialect< init> 
产品介绍：HHH000400：使用方言：org.hibernate.dialect.SQLServerDialect并在
异常线程 main org.hibernate.MappingException：未知实体：hibernate.User 
在org.hibernate.internal .SessionFactoryImpl.getEntityPersister（SessionFactoryImpl.java:776）
 at org.hibernate.internal.SessionImpl.getEntityPersister（SessionImpl.java:1520）
 at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId（AbstractSaveEventListener .java：100）
 at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId（DefaultSaveOrUpdateEventListener.java:192）
 at org.hibernate.event.internal.DefaultSaveEventListener.saveWithGeneratedOrRequestedId（DefaultSaveEventListener.java:38 ）
 at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsTransient（DefaultSaveOrUpdateEventListener.java:177）
 at org.hibernate.event.internal.DefaultSaveEventListener.performSaveOrUpdate（DefaultSaveEven tListener.java:32）美元，org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate（DefaultSaveOrUpdateEventListener.java:73 B $ B）
在org.hibernate.internal.SessionImpl.fireSave（SessionImpl.java:679）在org.hibernate.internal.SessionImpl.save（SessionImpl.java:671）
在org.hibernate.internal.SessionImpl.save（SessionImpl.java:666）
 
在hibernate.App .main（App.java:27）
  
我见过很多人有这个问题，但仍然没有能够弄清楚我的。感谢您的帮助。
解决方案
您的会话工厂配置为对Hibernate 5不正确。如果您使用Hibernate 5，您可以通过这种方式创建会话工厂。
  sessionFactory = new Configuration（）。configure（）。 buildSessionFactory（）; 
  
在文件 User.hbm.xml中你不应该使用命名空间
 
 
 
 http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd $ b 
使用
 
 
 
 http://www.hibernate.org / b 
 $ b 
改为
Yes, I have seen this question all over the place,but am still not able to figure out what is the issue with my code. Certainly am overlooking something, can't just tell what. I could certainly use a second eye.


Here's my POJO.
package hibernate;

public class User {
    private int id;
    private String name;
    private int total;
    private int goal;

    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getTotal() {
        return total;
    }
    public void setTotal(int total) {
        this.total = total;
    }
    public int getGoal() {
        return goal;
    }
    public void setGoal(int goal) {
        this.goal = goal;
    }
}
Below is my hibernate.cfg.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
                                         "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
 <session-factory name="">
  <property name="hibernate.connection.driver_class">com.microsoft.sqlserver.jdbc.SQLServerDriver</property>
  <property name="hibernate.connection.url">jdbc:sqlserver://localhost:1433;DatabaseName=test;</property>
  <property name="hibernate.dialect">org.hibernate.dialect.SQLServerDialect</property>
  <property name="hibernate.connection.username">sa</property>
  <property name="hibernate.connection.password">admin</property>

  <mapping resource="hibernate/User.hbm.xml"/>
 </session-factory>
</hibernate-configuration>
Here's my User.hbm.xml
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated Jan 18, 2016 12:10:00 AM by Hibernate Tools 3.5.0.Final -->
<hibernate-mapping>
    <class name="hibernate.User" table="USER">
        <id name="id" type="int">
            <column name="ID" />
            <generator class="native" />
        </id>
        <property name="name" type="java.lang.String">
            <column name="NAME" />
        </property>
        <property name="total" type="int">
            <column name="TOTAL" />
        </property>
        <property name="goal" type="int">
            <column name="GOAL" />
        </property>
    </class>
</hibernate-mapping>
Here's the main app putting the above together:
package hibernate;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;

public class App {

    private static SessionFactory sessionFactory;
    private static ServiceRegistry serviceRegistry;

    public static void main(String[] args) {
        Configuration configuration = new Configuration().configure();
        serviceRegistry = new StandardServiceRegistryBuilder()
                    .applySettings(configuration.getProperties()).build();

        sessionFactory = configuration.buildSessionFactory(serviceRegistry); 

        Session session = sessionFactory.openSession();
        session.beginTransaction();

        User user = new User();     
        user.setName("Joe");
        user.setGoal(250);
        session.save(user);

        session.getTransaction().commit();
        session.close();    
        HibernateUtility.getSessionFactory().close();
    }
}
When i run the above, I get the exception below.
Jan 18, 2016 9:34:04 AM org.hibernate.dialect.Dialect <init>
INFO: HHH000400: Using dialect: org.hibernate.dialect.SQLServerDialect
Exception in thread "main" org.hibernate.MappingException: Unknown entity: hibernate.User
    at org.hibernate.internal.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:776)
    at org.hibernate.internal.SessionImpl.getEntityPersister(SessionImpl.java:1520)
    at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:100)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:192)
    at org.hibernate.event.internal.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:38)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:177)
    at org.hibernate.event.internal.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:32)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:73)
    at org.hibernate.internal.SessionImpl.fireSave(SessionImpl.java:679)
    at org.hibernate.internal.SessionImpl.save(SessionImpl.java:671)
    at org.hibernate.internal.SessionImpl.save(SessionImpl.java:666)
    at hibernate.App.main(App.java:27)
I have seen many people having this issues,but still havent been able to figure out mine. Thanks a bunch for your help.
解决方案
Your session factory configuration is incorrect for Hibernate 5. If you use Hibernate 5, you can create a session factory by this way
sessionFactory = new Configuration().configure().buildSessionFactory();
In the file User.hbm.xml you shouldn't use namespace

"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"

Use

"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"

instead 

                        
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