程序报错。不能自动注入，麻烦老师看看哪儿出问题了，谢谢

//spring配置

<?xml version="1.0" encoding="UTF-8" ?>
<beans xmlns="http://www.springframework.org/schema/beans"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xmlns:context="http://www.springframework.org/schema/context"
      xmlns:aop="http://www.springframework.org/schema/aop"
      xmlns:tx="http://www.springframework.org/schema/tx"
      xsi:schemaLocation="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/aop
   http://www.springframework.org/schema/aop/spring-aop.xsd
   http://www.springframework.org/schema/tx
   http://www.springframework.org/schema/tx/spring-tx.xsd">

   <!--spring整合Mybatis-->
   <!--数据源-->
   <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
       <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
       <property name="url" value="jdbc:mysql://localhost:3306/hospital?useUnicode=true&amp;characterEncoding=utf-8"/>
       <property name="username" value="root"/>
       <property name="password" value="root"/>
   </bean>
   <!--session工厂-->
   <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
       <property name="dataSource" ref="dataSource"/>
       <property name="typeAliasesPackage" value="com.imooc.entity"/>
   </bean>
   <!--持久化对象-->
   <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
       <property name="basePackage" value="com.imooc.dao"/>
       <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
   </bean>
   <!-- 声明式事务 -->
   <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
       <property name="dataSource" ref="dataSource"/>
   </bean>
   <tx:advice id="txAdvice" transaction-manager="transactionManager">
       <tx:attributes>
           <tx:method name="get*" read-only="true"/>
           <tx:method name="find*" read-only="true"/>
           <tx:method name="search*" read-only="true"/>
           <tx:method name="*" propagation="REQUIRED"/>
       </tx:attributes>
   </tx:advice>
   <!--织入-->
   <aop:config>
       <aop:pointcut id="txPointcut" expression="execution(* com.imooc.service.*.*(..))"/>
       <aop:advisor advice-ref="txAdvice" pointcut-ref="txPointcut"/>
   </aop:config>
   <!--自动扫描-->
   <!--全局扫描-->
   <context:component-scan base-package="com.imooc"/>
   <aop:aspectj-autoproxy/>
</beans>

//categoryDao配置

<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.4//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="com.imooc.dao.CategoryDao">
   <resultMap id="resultMap" type="Department">
       <id property="id" column="id" javaType="Integer"/>
       <result property="name" column="name" javaType="String"/>
       <result property="createTime" column="create_time" javaType="java.util.Date"/>
       <result property="updateTime" column="update_time" javaType="java.util.Date"/>
   </resultMap>
   <insert id="add" parameterType="Category" useGeneratedKeys="true">
       insert into category(name,create_time) values(#{name},#{createTime})
   </insert>
   <delete id="delete" parameterType="Integer">
       delete from category where id=#{id}
   </delete>
   <update id="update" parameterType="Category">
       update category set name=#{name},update_time=#{updateTime} where id=#{id}
   </update>
   <select id="selectById" parameterType="Integer" resultMap="resultMap">
       select * from category where id=#{id}
   </select>
   <select id="selectAll" resultMap="resultMap">
       select * from category
   </select>
</mapper>

//serviceimpl类代码

package com.imooc.service.impl;

import com.imooc.dao.CategoryDao;
import com.imooc.entity.Category;
import com.imooc.service.CategoryService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;
@Service("categoryService")
public class CategoryServiceImpl implements CategoryService {
   @Autowired
   private CategoryDao categoryDao;
   public void add(Category category) {
       categoryDao.add(category);
   }

   public void delete(int id) {
      categoryDao.delete(id);
   }

   public void update(Category category) {
     categoryDao.update(category);
   }

   public Category selectById(int id) {
       return categoryDao.selectById(id);
   }

   public List<Category> selectAll() {
       return categoryDao.selectAll();
   }
}

//Dao类代码

package com.imooc.dao;

import com.imooc.entity.Category;
import org.springframework.stereotype.Repository;

import java.util.List;
@Repository("categoryDao")
public interface CategoryDao {
   void add(Category category);
   void delete(int id);
   void update(Category category);
   Category selectById(int id);
   List<Category> selectAll();
}