最近要改造一下项目，自动扫描注册service和dao，自动注入dao、service；但遇到No Session found for current thread 的问题，配置如下：

*************spring配置文件：*************
<!-- 自动注册bean -->

<context:component-scan base-package="mod" use-default-filters="true"> <context:include-filter type="regex" expression="mod.dao.*" /> <context:include-filter type="regex" expression="mod.service.*" /> </context:component-scan>

<!-- 注册HibernateDAO -->

<bean class="com.base.HibernateDAO" scope="prototype">

<property name="sessionFactory" ref="sessionFactory" />

</bean>

//bean 只配置了action的（这个是必须的）

<bean id="admin_log_Action" class="mod.action.sys.LogAction" scope="prototype" />

同时配置了声明式事务（为了方便，无需在Service里加注解）

*************dao层（没有接口，直接继承Hibernate原生泛型DAO）：*************
@Repository

public class LogDAO extends HibernateDAO<Log> {
}

*************Service层（接口+实现类）：*************
@Service

public interface LogService {}

@Service

public class LogServiceImpl implements LogService {}

*************action层：*************
public class LogAction extends AbstractAction {
private static final long serialVersionUID = 1L;

@Resource

private LogService logService;
}

*************HibernateDAO基类（无接口）*************
public class HibernateDAO<T> {

protected Logger logger = LoggerFactory.getLogger(getClass());
protected SessionFactory sessionFactory;
protected Class<T> entityClass;

public HibernateDAO() {

 this.entityClass = ReflectionUtils.getSuperClassGenricType(getClass()); }

public HibernateDAO(final SessionFactory sessionFactory, final Class<T> entityClass) {

this.sessionFactory = sessionFactory; this.entityClass = entityClass; }

public SessionFactory getSessionFactory() { return sessionFactory; }

public void setSessionFactory(final SessionFactory sessionFactory) {
this.sessionFactory = sessionFactory; }
public Session getSession() {
return sessionFactory.getCurrentSession(); } }

 在setSessionFactory 上加 @Autowired 的时候，报出错误为：
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)

去掉的话报错为：
java.lang.NullPointerException at com.base.HibernateDAO.getSession(HibernateDAO.java:110) at com.base.HibernateDAO.createCriteria(HibernateDAO.java:359)

有木有大侠知道，这是什么问题啊？请指导一下啊：