org.hibernate.HibernateException：找不到当前线程的会话 [英] org.hibernate.HibernateException: No Session found for current thread

问题描述

我收到了Spring3和Hibernte4的上述异常

以下是我的bean xml文件

 <？xml version =1.0encoding =UTF-8？> 
< beans xmlns =http://www.springframework.org/schema/beans
 xmlns：context =http://www.springframework.org/schema/context
 xmlns：tx =http://www.springframework.org/schema/tx
 xmlns：xsi =http://www.w3.org/2001/XMLSchema-instance
 xsi ：schemaLocation =
 http://www.springframework.org/schema/beans 
 http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 
 http://www.springframework.org/schema/context 
 http://www.springframework.org/schema/context/spring-context-3.0.xsd 
 http：//www.springframework。 org / schema / tx 
 http://www.springframework.org/schema/tx/spring-tx-3.1.xsd\"> 
 
< context：annotation-config /> 
 
 
< bean id =dataSourceclass =org.springframework.jdbc.datasource.DriverManagerDataSource> 
< property name =driverClassNamevalue =com.mysql.jdbc.Driver/> 
< property name =urlvalue =jdbc：mysql：// localhost：3306 / GHS/> 
< property name =usernamevalue =root/> 
< property name =passwordvalue =newpwd/> 
< / bean> 
 
< bean id =sessionFactory
 class =org.springframework.orm.hibernate4.LocalSessionFactoryBean> 
< property name =dataSourceref =dataSource/> 
< property name =hibernateProperties> 
<道具> 
< prop key =dialect> org.hibernate.dialect.MySQL5Dialect< / prop> 
< /道具> 
< / property> 
< property name =packagesToScan> 
< list> 
< value> com.example.ghs.model.timetable< / value> 
< / list> 
< / property> 
< / bean> 
 
< bean id =baseDAO
 class =com.example.ghs.dao.BaseDAOImpl/> 
< / beans> 
  

我的BaseDAO类看起来像这样

  public class BaseDAOImpl implements BaseDAO {
 private SessionFactory sessionFactory; 
 
 @Autowired 
 public BaseDAOImpl（SessionFactory sessionFactory）{
 this.sessionFactory = sessionFactory; 
} 
 
 @Override 
 public Session getCurrentSession（）{
 return sessionFactory.getCurrentSession（）; 
 
 
 
 
 $ b $ p 
 $ b 
以下代码在标题中引发异常， p> 
 
 
  public class Main {
 public static void main（String [] args）{
 ClassPathXmlApplicationContext context = 
 new ClassPathXmlApplicationContext（dao-beans.xml）; 
 BaseDAO bd =（BaseDAO）context.getBean（baseDAO）; 
 bd.getCurrentSession（）; 
 
 
 
 
 
 
 $ b 
有没有人对如何解决这个问题有所了解？
解决方案 
  getCurrentSession（） 。
 
 
您需要声明适当的事务管理器，划分事务的边界并在其中执行数据访问。例如，如下所示： 
 
 
 < bean id =transactionManagerclass =org.springframework.orm.hibernate4.HibernateTransactionManager > 
< property name =sessionFactoryref =sessionFactory/> 
< / bean> 
  
。
  PlatformTransactionManager ptm = context.getBean（PlatformTransactionManager.class）; 
 TransactionTemplate tx = new TransactionTemplate（ptm）; 
 
 tx.execute（new TransactionCallbackWithoutResult（）{
 public void doInTransactionWithoutResult（TransactionStatus status）{
 //在这里执行数据访问
} 
}） ; 
  
 另请参阅： 
 
 
 
 
 
  10。交易管理 
 
 
  13.3 Hibernate  
 
 
 
I'm getting the above exception with Spring3 and Hibernte4

The following is my bean xml file
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
   xmlns:context="http://www.springframework.org/schema/context"
   xmlns:tx="http://www.springframework.org/schema/tx"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="
    http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-3.0.xsd
    http://www.springframework.org/schema/tx
    http://www.springframework.org/schema/tx/spring-tx-3.1.xsd">

   <context:annotation-config/>


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

  <bean id="sessionFactory"
      class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
    <property name="dataSource" ref="dataSource"/>
    <property name="hibernateProperties">
        <props>
            <prop key="dialect">org.hibernate.dialect.MySQL5Dialect</prop>
        </props>
    </property>
    <property name="packagesToScan">
        <list>
            <value>com.example.ghs.model.timetable</value>
        </list>
    </property>
  </bean>

   <bean id="baseDAO"
      class="com.example.ghs.dao.BaseDAOImpl"/>
</beans>
My BaseDAO class looks like this
public class BaseDAOImpl implements BaseDAO{
private SessionFactory sessionFactory;

 @Autowired
 public BaseDAOImpl(SessionFactory sessionFactory){
     this.sessionFactory = sessionFactory;
 }

 @Override
 public Session getCurrentSession(){
     return sessionFactory.getCurrentSession();
 }
}
The following code throws the exception in the title
public class Main {
 public static void main(String[] args){
    ClassPathXmlApplicationContext context =
            new ClassPathXmlApplicationContext("dao-beans.xml");
    BaseDAO bd = (BaseDAO) context.getBean("baseDAO");
    bd.getCurrentSession();
 }
}
Does anyone have an idea about how to solve this problem?
解决方案
getCurrentSession() only makes sense inside a scope of transaction.

You need to declare an appropriate transaction manager, demarcate boundaries of transaction and perform data access inside it. For example, as follows:
<bean id = "transactionManager" class = "org.springframework.orm.hibernate4.HibernateTransactionManager">
    <property name = "sessionFactory" ref = "sessionFactory" />
</bean>
.
PlatformTransactionManager ptm = context.getBean(PlatformTransactionManager.class);
TransactionTemplate tx = new TransactionTemplate(ptm);

tx.execute(new TransactionCallbackWithoutResult() {
    public void doInTransactionWithoutResult(TransactionStatus status) { 
        // Perform data access here
    }
});
See also:


10. Transaction Management
13.3 Hibernate


                        
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