未找到当前线程的会话：Spring 3和Hibernate 4（使用@PostConstruct批注）

Question

我阅读了类似问题的人的大量帖子，但仍然无法使我的代码正常工作。

当我将@Transactional从Dao移到服务层时，出现“ No Session found for current thread ”。 的确，我深信将事务绑定到单个访问是浪费资源。 顺便说一下，我的Web应用程序配置很常见：

• 春季3.1.2
• 休眠4

我无法解决问题，我检查了著名的<tx:annotation-driven>是否在正确的位置以及正确的<context:component-scan ...> 。 我的猜测是spring需要将@Transactional也放在具有会话工厂引用的类的顶部，但是对我来说似乎有点不合逻辑。

这是servlet

<!-- auto-detects and registers annotated classes belonging to the base package-->
<context:component-scan base-package="com.x.y.controllers" />
<!-- flips on all the annotation-driven capabilities for Spring MVC -->
<mvc:annotation-driven />   
...

这是上下文

<!-- enables the @Transactional annotantions -->
<tx:annotation-driven transaction-manager="transactionManager"/>

<bean id="transactionManager"
    class="org.springframework.orm.hibernate4.HibernateTransactionManager">
    <property name="sessionFactory" ref="sessionFactory" />
</bean>

<!-- auto-detects and registers annotated classes belonging to the base package-->
<context:component-scan base-package="com.x.y.service" />
<context:component-scan base-package="com.x.y.aop" />
<context:component-scan base-package="com.x.y.model" />


<bean id="dataSource"
class = "com.mchange.v2.c3p0.ComboPooledDataSource"
destroy-method="close">
    <property name="driverClass" value="${database.driver.className}" />
    <property name="jdbcUrl" value="${database.uri}" />
    <property name="user" value="${database.username}" />
    <property name="password" value="${database.password}" />

    <!-- these are C3P0 properties -->       
    <property name="checkoutTimeout" value="30000" />
    <property name="initialPoolSize" value="10" />
    <property name="maxIdleTime" value="30" />
    <property name="minPoolSize" value="10" />
    <property name="maxPoolSize" value="100" />
    <property name="maxStatements" value="200" />
    <property name="testConnectionOnCheckout" value="false" />
    <property name="testConnectionOnCheckin" value="true" />
    <property name="preferredTestQuery" value="SELECT 1" />
    <property name="idleConnectionTestPeriod" value="30" />
</bean> 

<bean id="sessionFactory"
    class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
    <property name="dataSource" ref="dataSource" />
    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">${database.hibernate.dialect}</prop>
            <prop key="hibernate.hbm2ddl.auto">update</prop>
            <prop key="hibernate.cache.use_second_level_cache">true</prop>
            <prop key="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.EhCacheRegionFactory</prop>
            <prop key="hibernate.generate_statistics">true</prop>
            <prop key="hibernate.show_sql">false</prop>
            <prop key="hibernate.connection.SetBigStringTryClob">true</prop>
            <prop key="hibernate.jdbc.batch_size">0</prop>          
        </props>
    </property>
</bean>

这是服务

package com.x.y.service.initialization;

@Component
public class Initializer {

    @Autowired
    @Qualifier("userDaoImpl")
    private UserDao userDao;

    @PostConstruct
    @Transactional
    public void init()
    {
        ProfiledUser admin = userDao.loadByUsername("Administrator");

        ...
    }
}

这是DAO

package com.x.y.model.dao;

@Repository(value="userDaoImpl")
public class UserDaoImpl implements UserDao{

    @Autowired
    @Qualifier("sessionFactory")
    protected SessionFactory sessionFactory;

    public ProfiledUser loadByUsername(String username)
    {
        Session session = sessionFactory.getCurrentSession();
        Criteria criteria = session.createCriteria(ProfiledUser.class);
        criteria.add(Restrictions.eq("username", username));
        ProfiledUser user = (ProfiledUser) criteria.uniqueResult();
        if(user != null)
            return user;
        else
            return null;
    }
}

这是堆栈跟踪

ERROR: org.springframework.web.context.ContextLoader - Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'initializer': Invocation of init method failed; nested exception is org.hibernate.HibernateException: No Session found for current thread
    at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:135)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:394)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1448)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:294)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:225)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:291)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:609)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:918)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:469)
    at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:383)
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:283)
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:111)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4206)
    at org.apache.catalina.core.StandardContext.start(StandardContext.java:4705)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1057)
    at org.apache.catalina.core.StandardHost.start(StandardHost.java:840)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1057)
    at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463)
    at org.apache.catalina.core.StandardService.start(StandardService.java:525)
    at org.apache.catalina.core.StandardServer.start(StandardServer.java:754)
    at org.apache.catalina.startup.Catalina.start(Catalina.java:595)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
Caused by: org.hibernate.HibernateException: No Session found for current thread
    at org.springframework.orm.hibernate4.SpringSessionContext.currentSession(SpringSessionContext.java:97)
    at org.hibernate.internal.SessionFactoryImpl.getCurrentSession(SessionFactoryImpl.java:881)
    at com.x.y.model.dao.UserDaoImpl.loadByUsername(UserDaoImpl.java:37)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:319)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
    at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:90)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
    at com.sun.proxy.$Proxy15.loadByUsername(Unknown Source)
    at com.x.y.service.initialization.Initializer.init(Initializer.java:46)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement.invoke(InitDestroyAnnotationBeanPostProcessor.java:346)
    at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata.invokeInitMethods(InitDestroyAnnotationBeanPostProcessor.java:299)
    at org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization(InitDestroyAnnotationBeanPostProcessor.java:132)
    ... 29 more

Answer 1

可能是其他答案所暗示的错误配置，但是请记住，您不应使用@Transactional注释@PostConstruct并期望它可以工作。 在执行@PostConstruct时，不能保证您的代码已使用事务性语义进行检测。 原因是@PostConstruct仅保证所有依赖项都已注入并且Bean构造已完成，但这并不意味着完整的上下文已完成加载（不保证事务工具已完成）。

如果您确实需要@PostConstruct事务，请采用编程方式。 这些只是我的两分钱，但很可能是造成您问题的原因

UPDATE

刚刚找到一个有关它的博客 ，他们在其中建议@PostInitialize的用法，因为它保证在加载完整的上下文之后会被调用

Answer 2

您声明了“数据源”和“会话工厂”，但您却错过了他的“事务管理器”

尝试将其添加到spring上下文中：

<bean id="transactionManager"
        class="org.springframework.orm.hibernate4.HibernateTransactionManager">
    <property name="sessionFactory" ref="sessionFactory"/>
</bean> 

希望对您有所帮助

Answer 3

您可以在hibernate-context.xml中定义事务管理器

<tx:annotation-driven transaction-manager="hbnTransactionManager" />
    <bean id="hbnTransactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">
        <property name="sessionFactory">
            <ref bean="sessionFactory" />
        </property>
    </bean>

Answer 4

由于您是直接在DAO中使用SessionFactory ，因此必须具有以下配置hibernate.current_session_context_class并且SessionFactory配置应如下所示。

<bean id="sessionFactory"
    class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
    <property name="dataSource" ref="dataSource" />
    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">${database.hibernate.dialect}</prop>
            <prop key="hibernate.hbm2ddl.auto">update</prop>
            <prop key="hibernate.cache.use_second_level_cache">true</prop>
            <prop key="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.EhCacheRegionFactory</prop>
            <prop key="hibernate.generate_statistics">true</prop>
            <prop key="hibernate.show_sql">false</prop>
            <prop key="hibernate.connection.SetBigStringTryClob">true</prop>
            <prop key="hibernate.jdbc.batch_size">0</prop> 
            <!-- Add this configuration -->
            <prop key="hibernate.current_session_context_class">thread</prop>          
        </props>
    </property>
</bean>

Answer 5

我有同样的问题。

我使用的是基于注释的配置，我已经配置了sessionfactory，数据源和事务管理器。 但我没有在AppConfig类中提供@EnableTransactionManagement批注。

添加事务注释后，代码如下所示。

@Configuration
@ComponentScan("com.bmp.*")
@EnableWebMvc
@PropertySource("classpath:${env}.properties")
@EnableTransactionManagement
public class AppConfig {
-----
}

上面的注释解决了我的问题。

如果这可以解决，请投票给您解决问题。