not found for dependency: expected at least 1 bean which qualifies as autowire

No qualifying bean of type [com.lion.service.UserService] found for dependency [com.lion.service.UserService]:
expected at least 1 bean which qualifies as autowire candidate for this dependency.

我用的框架是SSM：
1.检查@Autowired有没有拼错
2.applicationContext.xml中加入表现层注解，开启自动扫描

<context:component-scan base-package="com.lion.action"></context:component-scan>

也可以这么写 base-package=”com.*” 全部扫描

3.这一点和我的写法有关系，在applicationContext.xml中创建DAO，注入SqlSessionFactory，创建服务层，注入DAO。

<bean id="userDAO" class="com.lion.dao.UserDAOImpl"><property name="sqlSessionFactory" ref="sqlSessionFactory"></property>
</bean><bean id="userService" class="com.lion.service.UserServiceImpl">
<property name="userDAO" ref="userDAO"></property>
</bean>

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