我的理解@Transactional应该只应用于需要在事务中发生的服务方法（例如设置器）。假设我有以下两个类（分别是 DAO 层和服务层）......
@Service("playerService")
public class PlayerServiceImpl implements PlayerService {
@Autowired
private PlayerDao playerDao;
@Override
public List<Player> getAll() {
return playerDao.getAll();
}
@Override
@Transactional
public void addAllPlayers(final List<Player> players) {
playerDao.addAllPlayers(players);
}
}
@Repository("playerDao")
public class PlayerDaoImpl implements PlayerDao {
@Autowired
private SessionFactory sessionFactory;
@SuppressWarnings("unchecked")
@Override
public List<Player> getAll() {
return (List<Player>) sessionFactory.getCurrentSession()
.createQuery("FROM Player").list();
}
@Override
public void addPlayer(final Player player) {
sessionFactory.getCurrentSession().save(player);
}
}
现在，如果我称它为addAllPlayers()正常工作，则完全没有问题。但是当我使用时getAll()， sessionFactory.getCurrentSession 会抛出 HibernateException，没有为当前线程找到会话。
如果我@Transactional为 getAll() 添加到服务层，现在可以“正常”工作。这个问题是我不应该仅仅为了调用一个getter而打开一个事务。
谁能想到我需要添加@Transactionalgetter方法以使sessionFactory拥有当前会话的任何原因？我的 servlet-context.xml 和 persistance-context.xml 如下所示（这些都在我的 web.xml 中的 contextConfigLocation 中引用）
servlet-context.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans:beans xmlns:mvc="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:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">
<!-- DispatcherServlet Context: defines this servlet's request-processing
infrastructure -->
<!-- Enables the Spring MVC @Controller programming model -->
<tx:annotation-driven transaction-manager="hibernateTransactionManager" />
<mvc:annotation-driven />
<!-- Handles HTTP GET requests for /resources/** by efficiently serving
up static resources in the ${webappRoot}/resources directory -->
<mvc:resources location="/resources/css/" mapping="/css/**" />
<mvc:resources location="/resources/js/" mapping="/js/**" />
<mvc:resources location="/resources/images/" mapping="/images/**" />
<mvc:resources location="/resources/img/" mapping="/img/**" />
<mvc:resources location="/favicon.ico" mapping="/favicon.ico" />
<!-- 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>
<context:component-scan base-package="com.footieview.app" />
<beans:bean
class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
<beans:property name="mediaTypes">
<beans:map>
<beans:entry key="html" value="text/html" />
<beans:entry key="json" value="application/json" />
</beans:map>
</beans:property>
<beans:property name="defaultViews">
<beans:list>
<beans:bean
class="org.springframework.web.servlet.view.json.MappingJacksonJsonView">
<beans:property name="prefixJson" value="true" />
</beans:bean>
</beans:list>
</beans:property>
</beans:bean>
<beans:bean id="PlayerImportDaoImpl"
class="com.footieview.app.importer.dao.PlayerImportDaoImpl" />
<beans:bean id="hibernateTransactionManager"
class="org.springframework.orm.hibernate4.HibernateTransactionManager">
<beans:property name="sessionFactory" ref="sessionFactory" />
</beans:bean>
</beans:beans>
持久性上下文.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans:beans xmlns:mvc="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:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">
<beans:bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<beans:property name="driverClassName" value="com.mysql.jdbc.Driver" />
<beans:property name="url"
value="jdbc:mysql://localhost/db" />
<beans:property name="username" value="username" />
<beans:property name="password" value="password" />
</beans:bean>
<beans:bean id="sessionFactory"
class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
<beans:property name="annotatedClasses">
<beans:list>
<beans:value>com.footieview.app.entity.Player</beans:value>
</beans:list>
</beans:property>
<beans:property name="dataSource" ref="dataSource" />
<beans:property name="packagesToScan" value="com.footieview.app.entity.*" />
<beans:property name="hibernateProperties">
<beans:props>
<beans:prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect
</beans:prop>
<beans:prop key="hibernate.transaction.factory_class">org.hibernate.transaction.JDBCTransactionFactory
</beans:prop>
<beans:prop key="hibernate.show_sql">false</beans:prop>
<beans:prop key="hibernate.hbm2ddl.auto">create</beans:prop>
<beans:prop key="hibernate.cache.use_second_level_cache">
true
</beans:prop>
<beans:prop key="hibernate.cache.provider_class">
org.hibernate.cache.EhCacheProvider
</beans:prop>
<beans:prop key="hibernate.cache.use_query_cache">
true
</beans:prop>
<beans:prop key="hibernate.cache.region.factory_class">
org.hibernate.cache.ehcache.EhCacheRegionFactory
</beans:prop>
<beans:prop key="hibernate.cglib.use_reflection_optimizer">
true
</beans:prop>
</beans:props>
</beans:property>
</beans:bean>
</beans:beans>