@Transactional無法與Spring和Hibernate一起使用（在沒有活動事務的情況下，get無效）

Question

我創建了一個spring-mvc應用程序。 配置如下所示：

調度員servlet.xml中

<beans >
   <mvc:annotation-driven />
   <bean class="org.springframework.web.servlet.mvc.support.ControllerClassNameHandlerMapping"/>

   <context:component-scan base-package="my.server.controller" />

</beans>

applicationContext.xml中

<beans >
     <context:annotation-config />
     <tx:annotation-driven transaction-manager="transactionManager"/>
     <context:component-scan base-package="my.server.dao" />
     <context:component-scan base-package="my.server.service" />


    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
      <property name="driverClassName" value="org.postgresql.Driver" />
      <property name="url" value="jdbc:postgresql://localhost:5432/jahanserver" />
      <property name="username" value="postgres" />
      <property name="password" value="postgres" />
    </bean>

   <bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
      <property name="dataSource" ref="dataSource" />
      <property name="annotatedClasses">
        <list>
            <value>my.server.entity.TreeItem</value>
            <value>my.server.entity.TreeItemDetail</value>
            <value>my.server.entity.LayerItem</value>
        </list>
      </property>
      <property name="hibernateProperties">
        <props>
           <prop key="hibernate.dialect">org.hibernate.spatial.dialect.postgis.PostgisDialect</prop>
            <prop key="hibernate.current_session_context_class">thread</prop>
            <prop key="hibernate.show_sql">true</prop>
            <prop key="hibernate.hbm2ddl.auto">update</prop>
            <prop key="hibernate.connection.characterEncoding">UTF-8</prop>
            <prop key="hibernate.connection.charSet">UTF-8</prop>
            <prop key="hibernate.default_schema">public</prop>
        </props>
      </property>
   </bean>
   <bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">
      <property name="sessionFactory" ref="sessionFactory"/>
   </bean>
</beans>

通過web.xml的以下行加載applicationContext.xml ：

web.xml中

<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/applicationContext.xml, /WEB-INF/security.xml</param-value>
</context-param>

my.server.service.TreeServiceImpl

@Service
public class TreeServiceImpl implements TreeService {

   @Inject
   TreeDao treeDao;

   @Override
   @Transactional
   public TreeItem getTreeItem(Long id) {
       return treeDao.getTreeItem(id);
   }
}

my.server.dao.TreeDaoImpl

@Service
@Singleton
public class TreeDaoImpl extends AbstractDaoImpl implements TreeDao{

    public TreeItem getTreeItem(Long id){
        return (TreeItem)sessionFactory.getCurrentSession().get(TreeItem.class, id);
    }

    ...
}

my.server.controller.TreePermissionController.java

@RestController
@RequestMapping("/treePermission")
public class TreePermissionController implements InitializingBean{

   @Inject 
   TreeService treeService;

   private final PermissionFactory permissionFactory = new DefaultPermissionFactory();

   @Override
   public void afterPropertiesSet() throws Exception {
      Assert.notNull(treeService, "HBUtil cannot be null");
   }

   @RequestMapping(method = RequestMethod.GET, value = "/addPermission")
   public TreeItem addPermission(HttpServletRequest request, 
        @RequestParam Long id ) throws IOException {
       TreeItem item = treeService.getTreeItem(id);

       PrincipalSid sid = new PrincipalSid("dariush");
       Permission permission = permissionFactory.buildFromMask(16);

       try {
           treeService.addPermission(item, sid, permission);
       } catch (DataAccessException existingPermission) {
           existingPermission.printStackTrace();

       }
       return item;
   }

}

在控制器中，我稱之為：

TreeItem item = treeService.getTreeItem(id);

我遇到這個錯誤：

org.hibernate.HibernateException: get is not valid without active transaction

有人問過同樣問題的一些問題。 我遵循了所有建議，但對我來說仍然是一個問題。 我該如何解決？ 請幫忙！

Answer 1

當使用spring和spring管理的事務時，除非使用JTA，否則不要使用hibernate.current_session_context_class屬性。

實際上，默認情況下，Spring會默認設置其自己的CurrentSessionContext實現（SpringSessionContext），但是如果您自行設置，則情況並非如此，這意味着它正在破壞適當的事務集成。

所以請在applicationContext.xml中的hibernateProperties行下面刪除/注釋掉

<prop key="hibernate.show_sql">true</prop>

希望這可以解決您的錯誤