练手时发现个问题，路径404，各种检查发现，多加了一层<context:component-scan base-package="com.yanan.controller"/>写成了<context:component-scan base-package="com.yanan.*.controller"/>

解决后，发现service注入失败

org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.yanan.service.UserService.getListUsers

排查发现，扫描时

<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.yanan.mapper"/>
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
</bean>成功

<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.yanan.*"/>
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
</bean>失败

由此可见，扫描时*不是万能的，尽量指明具体包。

搭建环境是springmvc+mybatis+maven多模块。或许多模块下报的命名有关？还是本身扫描的包不能太宽泛？理解不深，请各位读者多多指教