Spring MVC - 没有Hibernate Session绑定到线程

Question

我在hibernate中遇到会话问题：

INFO: Starting ProtocolHandler ["http-bio-8080"]
2013-09-10 16:23:11 org.apache.catalina.startup.Catalina start
 INFO: Server startup in 4000 ms
2013-09-10 16:23:13 org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [appServlet] in context with path [/portal] threw          exception [Request processing failed; nested exception is org.hibernate.HibernateException: No Hibernate Session bound to thread, and configuration does not allow creation of non-transactional one here] with root cause
org.hibernate.HibernateException: No Hibernate Session bound to thread, and configuration does not allow creation of non-transactional one here
    at org.springframework.orm.hibernate3.SpringSessionContext.currentSession(SpringSessionContext.java:63)
    at org.hibernate.impl.SessionFactoryImpl.getCurrentSession(SessionFactoryImpl.java:687)
    at com.myportal.portal.model.HibernateDao.getSessionFactory(HibernateDao.java:31)
    at com.myportal.portal.model.HibernateDao.testowa(HibernateDao.java:46)
    at com.myportal.portal.controllers.HomeController.home(HomeController.java:35)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

我已经阅读过有关此问题的内容，但解决方案在我的情况下无效。

我的Dao课程：

package com.myportal.portal.model;
import org.hibernate.classic.Session;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;
import com.myportal.portal.entity.User;

@Repository
@Transactional(propagation=Propagation.REQUIRED)
public class HibernateDao {
    @Autowired
    private SessionFactory sessionFactory;


    public HibernateDao()
    {

    }
    public HibernateDao(SessionFactory sessionFactory)
    {
        this.sessionFactory = sessionFactory;
    }
    private Session getSessionFactory()
    {
        return sessionFactory.getCurrentSession();
    }

    private void setSessionFactory(SessionFactory sessionFactory)
    {
        this.sessionFactory = sessionFactory;
    }

    public void testowa()
    {
        User u = new User();
        //SessionFactory sf = getSessionFactory();
        //Session s = sf.openSession().beginTransaction()

        // problem with this
        Session session = getSessionFactory();
        //session.save(u);

    }
}

根context.xml中

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

    <!-- Root Context: defines shared resources visible to all other web components -->


<context:annotation-config/>
<tx:annotation-driven transaction-manager="transactionManager"/>

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
    <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
    <property name="url" value="jdbc:mysql://localhost/hibernate1"/>
    <property name="username" value="root2"/>
    <property name="password" value=""/>
    <property name="initialSize" value="5"/>
    <property name="maxActive" value="10"/>
</bean>    

<bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
   <property name="dataSource" ref="dataSource"/>
   <property name="packagesToScan" value="com.spoleczniak.projekt.model"/>
   <property name="hibernateProperties">
       <props>
           <prop key="dialect">org.hibernate.dialect.MySQLInnoDBDialect</prop>
           <prop key="show_sql">true</prop>
       </props>
   </property>
</bean>

    <bean id="transactionManager"
        class="org.springframework.orm.hibernate3.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory" />
    </bean>

     <bean class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor" />

</beans>

servlet的context.xml中

    <!-- DispatcherServlet Context: defines this servlet's request-processing infrastructure -->

    <!-- Enables the Spring MVC @Controller programming model -->
<annotation-driven />
    <context:annotation-config/>
<context:component-scan base-package="com.myportal.portal" />

    <!-- Handles HTTP GET requests for /resources/** by efficiently serving up static resources in the ${webappRoot}/resources directory -->
    <resources mapping="/resources/**" location="/resources/" />

    <!-- Resolves views selected for rendering by @Controllers to .jsp resources in the /WEB-INF/views directory -->
    <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>

我这样用：

@Controller
public class RegisterController {

    @Autowired
    private HibernateDao hibernateDao;

    @RequestMapping(value="/register")
    public String registerForm()
    {
        hibernateDao.testowa();
        return "register";
    }
}

我该如何解决？

我更改了DAO并创建了UserService，但仍然出现错误：

DAO：

@Repository
public class HibernateDao {
    @Autowired
    private SessionFactory sessionFactory;


    public HibernateDao()
    {

    }
    public HibernateDao(SessionFactory sessionFactory)
    {
        this.sessionFactory = sessionFactory;
    }
    private Session getSessionFactory()
    {
        return sessionFactory.getCurrentSession();
    }

    private void setSessionFactory(SessionFactory sessionFactory)
    {
        this.sessionFactory = sessionFactory;
    }

    public void testowa()
    {
        User u = new User();
        //SessionFactory sf = getSessionFactory();
        //Session s = sf.openSession().beginTransaction()

        // problem with this
        Session session = getSessionFactory();
        //session.save(u);

    }
} 

UserService：

@Service
public class UserService {

    @Autowired
    private HibernateDao hibernateDao;


    @Transactional
    public void addContact() 
    {
        hibernateDao.testowa(); 
    }
}

控制器：

@Controller
public class RegisterController {

    @Autowired
    private UserService userService;

    @RequestMapping(value="/register")
    public String registerForm()
    {
        userService.addContact();
        return "register";
    }
}

Answer 1

正在发生的事情是servlet-context.xml覆盖了root-context.xml中的bean，因为它为包含component-scan类的程序包声明了@Repository。在servlet-context.xml中，您有

<context:component-scan base-package="com.myportal.portal" />

当您的HibernateDao班级位于com.myportal.portal.model时。此ApplicationContext将创建一个HibernateDao bean ，无需事务管理，因为它没有<tx:annotation-driven>。 HibernateDao中自动装配的@Controller bean就是这个，而不是来自root-context.xml（具有事务管理）的bean。

要解决此问题，您需要先添加

<context:component-scan base-package="com.myportal.portal.model" />

到root-context.xml并删除<context:annotation-config/>（这是多余的）。然后，您想要将component-scan中的servlet-context.xml修改为更具体的，不包含@Repository类的包

<context:component-scan base-package="com.myportal.portal.controllers" />

该包将包含您的@Controller类。您也不需要<context:annotation-config>。

Answer 2

No Hibernate Session bound to thread, and configuration does not allow creation of non-transactional one here

这意味着该线程中没有当前事务。

当你纠正我的时候，这个类是用@Transactional注释的，但我发现它没有实现一个接口。如果您在没有实现接口的情况下注释控制器时，生成的代理可能不会公开注释。

See why CGLIB proxies do not retain certain annotations

Answer 3

在bean实例化期间，servlet-context.xml被读取，并且@Controller，@Service，@Repository的bean被实例化。

现在，当application-context.xml（具有<tx:annotation-driven />）被读取时，bean已经存在，因此不会获得事务行为。在servlet-context.xml中使用特定于UI的包，如控制器/或从组件扫描中排除服务，存储库包。

<context:component-scan base-package="com.java.controllers"/>