【发布时间】:2017-03-11 02:18:53
【问题描述】:
我遇到了异常 org.hibernate.MappingException: 未知实体 com.pro.entity.User
我看过类似的帖子,但几乎所有帖子都提供了将 @Entity 注释更改为 javax.persistence 而不是休眠的解决方案。在我的情况下,这没有用,因为我从一开始就使用正确的注释。这是实体类 dao 和 servlet 上下文的代码。
package com.pro.entity;
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="user")
public class User {
private static final long serialVersionUID = 1L;
@Id
@Column(name="userid")
@GeneratedValue(strategy=GenerationType.IDENTITY)
private String id;
@Column(name="password")
private String password;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
道类代码:
public User getUser(String userid)
{
Session session = this.sessionFactory.getCurrentSession();
User user = (User)session.load(User.class, userid);
return user;
}
context.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans:beans xmlns="http://www.springframework.org/schema/mvc"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:beans="http://www.springframework.org/schema/beans"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context"
xmlns:jdbc="http://www.springframework.org/schema/jdbc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
http://www.springframework.org/schema/orm
http://www.springframework.org/schema/orm/spring-orm-4.0.xsd
http://www.springframework.org/schema/jdbc
http://www.springframework.org/schema/jdbc/spring-jdbc-4.0.xsd">
<beans:bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<beans:property name="prefix" value="/WEB-INF/views/" />
<beans:property name="suffix" value=".jsp" />
</beans:bean>
<beans:bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<beans:property name="driverClassName" value="com.mysql.jdbc.Driver" />
<beans:property name="url"
value="jdbc:mysql://localhost:3306/pro?useSSL=false" />
<beans:property name="username" value="user" />
<beans:property name="password" value="password" />
</beans:bean>
<beans:bean id="sessionFactory"
class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
<beans:property name="dataSource" ref="dataSource"/>
<beans:property name="hibernateProperties">
<beans:props>
<beans:prop key="hibernate.dialect">${hibernate.dialect}</beans:prop>
<beans:prop key="hibernate.show_sql">${hibernate.show_sql}</beans:prop>
</beans:props>
</beans:property>
</beans:bean>
<beans:bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">
<beans:property name="sessionFactory" ref="sessionFactory"></beans:property>
</beans:bean>
<tx:annotation-driven transaction-manager="transactionManager"/><tx:annotation-driven/>
<beans:bean id="persistenceExceptionTranslationPostProcessor" class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor"></beans:bean>
<context:component-scan base-package="com.pro.controller" />
<mvc:resources mapping="/resources/**" location="/resources/" />
<mvc:annotation-driven />
</beans:beans>
【问题讨论】:
-
除非你在某个地方有一个秘密的休眠配置,否则休眠对你的实体一无所知......你没有指定一个包来扫描或手动注册实体。没有它,对于休眠你的实体根本不存在,不管它上面的注释。
-
你把 User.java 放在哪里了?它在
com.pro.entity包内吗? -
在发帖之前我实际上已经更改了一个代码,但相信我,项目结构符合 spring 规范。
标签: java spring-4 hibernate-4.x