遇到实体类注解配置的hibernate映射异常coz

Question

我收到此错误，因此我的应用程序无法为 sessionFactory 创建 bean 和为 transactionManager 创建 bean。

nested exception is org.hibernate.MappingException: An AnnotationConfiguration instance is required to use <mapping class="com.entity.Candidate"/>

我在这里分享我的代码，希望能更清楚。

web.xml：

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0"
         xmlns="http://java.sun.com/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
         metadata-complete="false">
        <servlet>
            <servlet-name>conceptedge</servlet-name>
            <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
            <load-on-startup>1</load-on-startup>
        </servlet>
        <listener>
        <listener class>org.springframework.web.context.ContextLoaderListener</listener-class>
        </listener>
        <context-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>/WEB-INF/conceptedge-persistence.xml</param-value>
        </context-param>
        <servlet-mapping>
            <servlet-name>conceptedge</servlet-name>
            <url-pattern>/</url-pattern>
        </servlet-mapping>
</web-app>

sessionFactory bean：

<bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
        <property name="dataSource" ref="dataSource"></property>
        <property name="configLocation" value="/WEB-INF/hibernate.cfg.xml"></property>
   </bean>

   <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
        <property name="url" value="jdbc:mysql://localhost:3306/interview"></property>
        <property name="username" value="root"></property>
        <property name="password" value="root"></property>
   </bean>

在 Dao 层，我正在访问前面提到的会话：

@Autowired
    SessionFactory sessionFactory;

    @Override
    public List<Candidate> getCandidatesList() {
        // TODO Auto-generated method stub
        Session session = sessionFactory.getCurrentSession();
        Criteria criteria = session.createCriteria(Candidate.class);
        return criteria.list();
    }

实体类

package com.entity;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;    
import org.hibernate.annotations.GenericGenerator;

@Entity
public class Candidate {

    private int number;
    private String name;

    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    @GenericGenerator(name = "system-uuid", strategy = "uuid")
    public int getNumber() {
        return number;
    }
    public void setNumber(int number) {
        this.number = number;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
}

servlet.xml：

<context:component-scan base-package="com" >
         <context:include-filter type="regex" expression="com.*"/>
   </context:component-scan>
    <mvc:annotation-driven />

    <bean
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/views/" />
        <property name="suffix" value=".jsp" />
    </bean>

Answer 1

使用时你必须用@Entity和@Table注释你的类

<mapping class="com.entity.Candidate"/>

否则，你需要使用 sth like

<mapping resource="com/entity/Candidate.hbm.xml" />

并为您的实体类添加等效的 xml 映射文件。

别忘了用AnnationConfiguration 类初始化你的sessionFactory

  new AnnotationConfiguration().configure().buildSessionFactory();