org.hibernate.MappingException:未知实体-根本原因是什么？
org.hibernate.MappingException:未知实体-根本原因是什么？
提问于 2016-02-17 18:49:36
我对hibernate还不熟悉。我正在遵循一个教程，并试图执行一个简单的代码，但我得到了下面的错误。
org.hibernate.MappingException: Unknown entity: 我使用的注释和配置文件也完全按照教程做的。我用谷歌搜索了一下，但没有得到正确的答案
这是我的代码
package org.anne;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
public class Demo {
public static void main(String[] args) {
Paper p = new Paper();
p.setPname("indu");
SessionFactory sf = HibernateUtil.getSessionFactory();
Session ses = sf.openSession();
Transaction tr = ses.beginTransaction();
ses.save(p);
tr.commit();
ses.close();
sf.close();
}
}
package org.anne;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistry;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
public class HibernateUtil {
static SessionFactory sf;
public static SessionFactory getSessionFactory()
{
Configuration cf = new Configuration();
cf.configure("hibernate.cfg.xml");
StandardServiceRegistryBuilder srv = new StandardServiceRegistryBuilder();
StandardServiceRegistry sr = srv.applySettings(cf.getProperties()).build();
sf = cf.buildSessionFactory(sr);
return sf;
}
}
package org.anne;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table(name = "PAPER")
public class Paper {
int pid;
String pname;
@Id
@Column(name = "PID")
@GeneratedValue(strategy = GenerationType.AUTO)
public int getPid() {
return pid;
}
public void setPid(int pid) {
this.pid = pid;
}
@Column(name = "PNAME")
public String getPname() {
return pname;
}
public void setPname(String pname) {
this.pname = pname;
}
}
<?xml version="1.0"?>
<!DOCTYPE hibernate-configuration SYSTEM "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd" >
<hibernate-configuration>
<session-factory>
<property name = "connection.driver_class">com.mysql.jdbc.Driver</property>
<property name = "connection.url">jdbc:mysql://localhost:3306/test</property>
<property name = "connection.username">root</property>
<property name = "connection.password">abc123</property>
<property name = "hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</property>
<property name = "hibernate.show_sql">true</property>
<mapping class = "org.anne.Paper" />
</session-factory>
</hibernate-configuration>Stack Overflow用户
发布于 2016-02-17 19:13:17
如果您自己启动Hibernate，请确保使用AnnotationConfiguration类而不是Configuration类。下面是一个使用(传统) HibernateUtil方法的示例：
package hello;
import org.hibernate.*;
import org.hibernate.cfg.*;
import test.*;
import test.animals.Dog;
public class HibernateUtil {
private static final SessionFactory sessionFactory;
static {
try {
sessionFactory = new AnnotationConfiguration()
.configure().buildSessionFactory();
} catch (Throwable ex) {
// Log exception!
throw new ExceptionInInitializerError(ex);
}
}
public static Session getSession()
throws HibernateException {
return sessionFactory.openSession();
}
}更多信息请点击此处https://docs.jboss.org/hibernate/stable/annotations/reference/en/html/ch01.html#setup-configuration
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/35454521
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