Question

我有以下实体，由于某种原因我无法映射，在运行时我得到“org.hibernate.MappingException：未知实体”

人：

package abo;

public class Human {

private int id;
private String name;
public Human()
{

}

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;
}

}

映射文件Human.hbm.xml（在同一个包中）：

<?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 16:40:24 26/09/2015 by Hibernate Tools 3.4.0.CR1 -->
<hibernate-mapping>
    <class name="abo.Human" table="human">
        <id name="id" type="int">
            <generator class="identity" />
        </id>
        <property name="name" type="java.lang.String">
        </property>
    </class>
</hibernate-mapping>

现在的hibernate配置文件（hibernate.cfg.xml）：

<?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.mysql.jdbc.Driver</property>
  <property name="hibernate.connection.password">blabla</property>
  <property name="hibernate.connection.url">jdbc:mysql://localhost:3306</property>
  <property name="hibernate.connection.username">root</property>
  <property name="hibernate.default_schema">protein_tracker</property>
  <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
  <mapping resource="abo/Human.hbm.xml"/>
 </session-factory>
</hibernate-configuration>

有什么建议吗？谢谢！

Answer 1

如何获得ServiceRegistry和SessionFactory实例？

我得到了同样的错误，但是当我尝试这个时它有效：

ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder().configure().build();

SessionFactory sessionFactory = new MetadataSources( serviceRegistry ).buildMetadata().buildSessionFactory();

我是从Hibernate Getting Started Guide

得到的

我正在研究一个类似于你的例子。我希望这能帮到你！

Answer 2

尝试将您的示例SessionFactory编写为：

SessionFactory objSf = new Configuration().configure().buildSessionFactory();

Answer 3

你需要在Human类之上的@Entity让Hibernate知道它的映射。您还需要将包路径和类名添加到配置文件中。就像是：＆LT; mapping class =＆＃34; abo.Human＆＃34; /＆gt;

Hibernate org.hibernate.MappingException：未知实体

3 个答案: