注释类+；cfg.xml=org.hibernate.MappingException:未知实体

这个问题在这里已经被描述了很多次，但我没有看到任何有效的建议如何消除它

下面是两个没有答案的相同问题：

我将再次描述这个问题

一个简单的教程应用程序

hibernate-core-5.3.1.Final

hibernate-annotations-3.5.6-Final

hibernate-jpa-2.0-api-1.0.0.Final

主类

package main;

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

public class Main {
    public static void main(String[] args) {
        Configuration conf = new Configuration().configure();
        StandardServiceRegistryBuilder builder = new StandardServiceRegistryBuilder();
        builder.applySettings(conf.getProperties());
        ServiceRegistry registry = builder.build();
        SessionFactory sessionFactory = conf.buildSessionFactory(registry);

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

        Employee employee = new Employee();
        employee.setFirstName("John");
        employee.setLastName("Doe");
        employee.setSalary(1000000);

        session.save(employee);
        transaction.commit();
        sessionFactory.close();
    }
}

package main;

import javax.persistence.*;

@Entity
@Table(name="EMPLOYEE")
public class Employee {
    @Id
    @GeneratedValue
    @Column(name = "ID")
    private int id;

    @Column(name = "FIRST_NAME")
    private String firstName;

    @Column(name = "LAST_NAME")
    private String lastName;

    @Column(name = "SALARY")
    private int salary;

    public Employee() {}

    public int getId() {
        return id;
    }

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

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public int getSalary() {
        return salary;
    }

    public void setSalary(int salary) {
        this.salary = salary;
    }
}

员工类别

package main;

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

public class Main {
    public static void main(String[] args) {
        Configuration conf = new Configuration().configure();
        StandardServiceRegistryBuilder builder = new StandardServiceRegistryBuilder();
        builder.applySettings(conf.getProperties());
        ServiceRegistry registry = builder.build();
        SessionFactory sessionFactory = conf.buildSessionFactory(registry);

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

        Employee employee = new Employee();
        employee.setFirstName("John");
        employee.setLastName("Doe");
        employee.setSalary(1000000);

        session.save(employee);
        transaction.commit();
        sessionFactory.close();
    }
}

package main;

import javax.persistence.*;

@Entity
@Table(name="EMPLOYEE")
public class Employee {
    @Id
    @GeneratedValue
    @Column(name = "ID")
    private int id;

    @Column(name = "FIRST_NAME")
    private String firstName;

    @Column(name = "LAST_NAME")
    private String lastName;

    @Column(name = "SALARY")
    private int salary;

    public Employee() {}

    public int getId() {
        return id;
    }

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

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public int getSalary() {
        return salary;
    }

    public void setSalary(int salary) {
        this.salary = salary;
    }
}

hibernate.cfg.xml文件

<?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="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</property>
        <property name="hibernate.connection.driver_class">com.mysql.cj.jdbc.Driver</property>
        <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/world</property>
        <property name="hibernate.connection.username">root</property>
        <property name="hibernate.connection.password">root</property>
        <property name="hibernate.connection.verifyServerCertificate">false</property>
        <property name="hibernate.connection.useSSL">true</property>
        <property name="hibernate.connection.requireSSL">false</property>
        <property name="hibernate.show_sql">true</property>
        <property name="hibernate.hbm2ddl.auto">create</property>
        <property name="hibernate.format_sql">true</property>
        <mapping class="main.Employee"/>
    </session-factory>
</hibernate-configuration>

org.hibernate.dialogue.mysql5dialogue
com.mysql.cj.jdbc.Driver
jdbc：mysql://localhost:3306/world
根
根
假的
真的
假的
真的
创造
真的

例外情况

INFO:HHH10001001:连接属性：{user=root，password=**，verifyServerCertificate=false，usesssl=true，requireSSL=false}
2018年6月26日上午10:54:38 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
信息：HHH10001003:自动提交模式：错误
2018年6月26日上午10:54:38 org.hibernate.engine.jdbc.connections.internal.driverManager连接ProviderImpl$PooledConnections
信息：HH000115:休眠连接池大小：20（最小值=1）
2018年6月26日上午10:54:38 org.hibernate.dialogue.dialogue
信息：HH000400:使用方言：org.hibernate.dialogue.mysql5dialogue
2018年6月26日上午10:54:39 org.hibernate.tool.schema.internal.SchemaCreatorImpl applyImportSources
信息：HH000476:正在执行导入脚本“org.hibernate.tool.schema.internal.exec”。ScriptSourceInputNonExistentImpl@5026735c'
线程“main”org.hibernate.MappingException中的异常：未知实体：main.Employee
位于org.hibernate.metamodel.internal.MetamodelImpl.entityPersister（MetamodelImpl.java:684）
位于org.hibernate.internal.SessionImpl.getEntityPersister（SessionImpl.java:1692）
位于org.hibernate.event.internal.AbstractSaveEventListener.SaveWithGenerateId（AbstractSaveEventListener.java:122）
在org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId（DefaultSaveOrUpdateEventListener.java:192）
位于org.hibernate.event.internal.DefaultSaveEventListener.saveWithGeneratedOrRequestedId（DefaultSaveEventListener.java:38）
位于org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsTransient（DefaultSaveOrUpdateEventListener.java:177）
位于org.hibernate.event.internal.DefaultSaveEventListener.performSaveOrUpdate（DefaultSaveEventListener.java:32）
位于org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate（DefaultSaveOrUpdateEventListener.java:73）
位于org.hibernate.internal.SessionImpl.fireSave（SessionImpl.java:709）
位于org.hibernate.internal.SessionImpl.save（SessionImpl.java:701）
位于org.hibernate.internal.SessionImpl.save（SessionImpl.java:696）
在main.main.main（main.java:26）

@实体

存在

存在映射

class=“main.Employee”

我请求帮助确定问题的原因。 请不要使用

configuration.addAnnotatedClass（Employee.class）

和创建hbm文件。 我尝试过的这些方法都很有效。 我对上述案例特别感兴趣。

• 您使用的是hibernate 5.3.1，因此不需要hibernate-annotations-3.5.6-Final
• 对于hibernate 5，声明如下类：

  import org.hibernate.SessionFactory;
  
  import org.hibernate.boot.MetadataSources;
  
  import org.hibernate.boot.registry.StandardServiceRegistry;
  
  import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
  
  public class HibernateUtil {
  
  private static final SessionFactory sessionFactory = 
  buildSessionFactory();
  
  private static SessionFactory buildSessionFactory() {
  
  try {
   final StandardServiceRegistry registry = new 
   StandardServiceRegistryBuilder()
          .configure() // configures settings from hibernate.cfg.xml
          .build();
  
      return new MetadataSources( registry ).buildMetadata().buildSessionFactory();
  
  }catch(Exception e) {   
  
      e.printStackTrace();
  
      throw new RuntimeException("There was an error building the factory...!");
  }
  

  }
  }

• 在您的主要方法中：

  Session session = HibernateUtil.getSessionFactory().openSession();