spring org.hibernate.HibernateException: 找不到当前线程的会话
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org.hibernate.HibernateException: No Session found for current thread
提问by Can't Tell
I'm getting the above exception with Spring3 and Hibernte4
我在 Spring3 和 Hibernte4 中遇到了上述异常
The following is my bean xml file
以下是我的bean xml文件
<?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
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();
}
}
The following code throws the exception in the title
以下代码在标题中抛出异常
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?
有没有人知道如何解决这个问题？
回答by axtavt
getCurrentSession()only makes sense inside a scope of transaction.
getCurrentSession()只有在交易范围内才有意义。
You need to declare an appropriate transaction manager, demarcate boundaries of transaction and perform data access inside it. For example, as follows:
您需要声明一个合适的事务管理器，划定事务边界并在其中执行数据访问。例如，如下：
<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:
也可以看看：
回答by Vishal Jagtap
I came across same problem and got solved as below Added @Transactional on daoImpl class
我遇到了同样的问题并如下解决在 daoImpl 类上添加 @Transactional
Added trnsaction manager in configuration file:
在配置文件中添加了事务管理器：
<tx:annotation-driven/>
<bean id="transactionManager"
class="org.springframework.orm.hibernate4.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory"></property>
</bean>
回答by lboix
I'll just add something that took me some time to debug : don't forget that a @Transactional annotation will only work on "public" methods.
我将添加一些花了我一些时间来调试的东西：不要忘记 @Transactional 注释仅适用于“公共”方法。
I put some @Transactional on "protected" ones and got this error.
我把一些@Transactional 放在“受保护的”上，并得到了这个错误。
Hope it helps :)
希望能帮助到你 ：）
http://docs.spring.io/spring/docs/3.1.0.M2/spring-framework-reference/html/transaction.html
http://docs.spring.io/spring/docs/3.1.0.M2/spring-framework-reference/html/transaction.html
Method visibility and @Transactional
When using proxies, you should apply the @Transactional annotation only to methods with public visibility. If you do annotate protected, private or package-visible methods with the @Transactional annotation, no error is raised, but the annotated method does not exhibit the configured transactional settings. Consider the use of AspectJ (see below) if you need to annotate non-public methods.
方法可见性和@Transactional
使用代理时，您应该仅将 @Transactional 注释应用于具有公共可见性的方法。如果您使用 @Transactional 注释对受保护的、私有的或包可见的方法进行注释，则不会引发错误，但带注释的方法不会显示配置的事务设置。如果您需要注释非公共方法，请考虑使用 AspectJ（见下文）。
回答by Kush Sharma
Which package u have put the BaseDAOImpl class in.. I think It requires a package name similar to the one u have used in the application context xml and it requires a relevant annotation too.
您将 BaseDAOImpl 类放入哪个包中。我认为它需要一个与您在应用程序上下文 xml 中使用的包名称类似的包名称，并且它也需要相关的注释。
