休眠映射例外：未知實體

Question

我正在使用xml文件映射將簡單的POJO映射到SQL Server中的數據庫表。我越來越Hibernate映射異常：未知的實體
這是我的代碼文件：
入口點類：

public class Program { 

    public static void main(String[] args) { 
     System.out.println("Helo World"); 

     Session session = HibernateUtilities.getSessionFactory().openSession(); 
     session.beginTransaction(); 

     User user = new User(); 
     user.setId(1); 
     user.setName("Ajay"); 
     user.setGoal(100); 
     user.setTotal(0); 

     session.save(user); 

     session.getTransaction().commit(); 
     session.close(); 
     HibernateUtilities.getSessionFactory().close(); 
     System.out.println("session closed"); 
    } 

} 

這是HibernateUtilities類：

public class HibernateUtilities { 
     private static SessionFactory sessionFactory; 
     private static ServiceRegistry serviceRegistry; 
     static { 
      try { 
       Configuration configuration = new Configuration().configure(); 
       serviceRegistry = new StandardServiceRegistryBuilder() 
         .applySettings(configuration.getProperties()).build(); 
       sessionFactory = configuration.buildSessionFactory(serviceRegistry); 
      } catch (HibernateException e) { 
       System.out.println(e); 
      } 
     } 

     public static SessionFactory getSessionFactory(){ 
      return sessionFactory; 
     } 

} 

這是POJO用戶：

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

    public int getId() { 
     return 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; 
    } 

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

這是映射文件：

<?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 Sep 14, 2016 11:58:02 AM by Hibernate Tools 3.4.0.CR1 --> 
    <hibernate-mapping package="com.example.hibernate"> 
    <class entity-name="User" name="com.example.hibernate.User" table="USERS"> 
     <id name="id" type="int"> 
     <column name="ID"/> 
     <generator class="increment"/> 
     </id> 
     <property generated="never" lazy="false" name="name" type="java.lang.String"> 
     <column name="NAME"/> 
     </property> 
     <property generated="never" lazy="false" name="total" type="int"> 
     <column name="TOTAL"/> 
     </property> 
     <property generated="never" lazy="false" name="goal" type="int"> 
     <column name="GOAL"/> 
     </property> 
    </class> 
    </hibernate-mapping> 

這是配置文件：

<?xml version="1.0" encoding="UTF-8"?> 
    <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" 
              "http://hibernate.sourceforge.net/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.password">ajay1994</property> 
     <property name="hibernate.connection.url">jdbc:sqlserver://localhost:1433;databaseName=protein_tracker</property> 
     <property name="hibernate.connection.username">test</property> 
     <property name="hibernate.dialect">org.hibernate.dialect.SQLServerDialect</property> 
     <mapping class="com.example.hibernate.User" resource="com/example/hibernate/User.hbm.xml"/> 
    </session-factory> 
    </hibernate-configuration> 

堆棧跟蹤錯誤：

Helo World 
Sep 14, 2016 2:58:58 PM org.hibernate.Version logVersion 
INFO: HHH000412: Hibernate Core {5.2.2.Final} 
Sep 14, 2016 2:58:58 PM org.hibernate.cfg.Environment <clinit> 
INFO: HHH000206: hibernate.properties not found 
Sep 14, 2016 2:58:58 PM org.hibernate.cfg.Environment buildBytecodeProvider 
INFO: HHH000021: Bytecode provider name : javassist 
Sep 14, 2016 2:58:58 PM org.hibernate.boot.jaxb.internal.stax.LocalXmlResourceResolver resolveEntity 
WARN: HHH90000012: Recognized obsolete hibernate namespace http://hibernate.sourceforge.net/hibernate-configuration. Use namespace http://www.hibernate.org/dtd/hibernate-configuration instead. Support for obsolete DTD/XSD namespaces may be removed at any time. 
Sep 14, 2016 2:58:58 PM org.hibernate.annotations.common.reflection.java.JavaReflectionManager <clinit> 
INFO: HCANN000001: Hibernate Commons Annotations {5.0.1.Final} 
Sep 14, 2016 2:58:58 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure 
WARN: HHH10001002: Using Hibernate built-in connection pool (not for production use!) 
Sep 14, 2016 2:58:58 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator 
INFO: HHH10001005: using driver [com.microsoft.sqlserver.jdbc.SQLServerDriver] at URL [jdbc:sqlserver://localhost:1433;databaseName=protein_tracker] 
Sep 14, 2016 2:58:58 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator 
INFO: HHH10001001: Connection properties: {user=test, password=****} 
Sep 14, 2016 2:58:58 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator 
INFO: HHH10001003: Autocommit mode: false 
Sep 14, 2016 2:58:58 PM org.hibernate.engine.jdbc.connections.internal.PooledConnections <init> 
INFO: HHH000115: Hibernate connection pool size: 20 (min=1) 
Sep 14, 2016 2:58:58 PM org.hibernate.dialect.Dialect <init> 
INFO: HHH000400: Using dialect: org.hibernate.dialect.SQLServerDialect 
Exception in thread "main" org.hibernate.MappingException: Unknown entity: com.example.hibernate.User 
    at org.hibernate.metamodel.internal.MetamodelImpl.entityPersister(MetamodelImpl.java:620) 
    at org.hibernate.internal.SessionImpl.getEntityPersister(SessionImpl.java:1604) 
    at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:104) 
    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:673) 
    at org.hibernate.internal.SessionImpl.save(SessionImpl.java:665) 
    at org.hibernate.internal.SessionImpl.save(SessionImpl.java:660) 
    at com.example.hibernate.Program.main(Program.java:18) 

Answer 1

打開hibernate.cfg.xml文件。按住ctrl並按住它，並點擊映射類「com.example.hibernate.User」檢查您是否導航到用戶類或不。