调用super.getSqlMapClient();返回空,求大神指导

t_activity_SqlMap.xml配置<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE sqlMap PUBLIC "-//ibatis.apache.org//DTD SQL Map 2.0//EN" "http://ibatis.apache.org/dtd/sql-map-2.dtd">
<sqlMap namespace="t_activity" >
 <resultMap id="ActivityAll" class="com.model.Activity">
  <result column="id" property="id" jdbcType="INTEGER" />
<result column="titile" property="title" jdbcType="VARCHAR" />
<result column="content" property="content" jdbcType="VARCHAR" />
<result column="imgurl" property="imgurl" jdbcType="VARCHAR" />
 </resultMap>
 
 <typeAlias alias="Activity" type="com.model.Activity"/>
 
 <select id="findActivity" resultClass="Activity">
 select id,title,content,imgurl from t_activity
 </select>
 
 
  <procedure id="call_asd">
  {CALL adminlogin_proc{}}
  </procedure>
 
</sqlMap>bean-activity.xml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"
xsi:schemaLocation="http://www.springframework.org/schema/beans 
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">

<!-- dao -->
<bean id="tactivityDAOImpl" class="com.dao.impl.TActivityDAOImpl">
<property name="sqlMapClient">
<ref bean="sqlMapClient"/>
</property>
</bean>
<!-- action -->
<bean id="ActivityInfoAction" class="com.web.ActivityInfoAction">
<property name="tactivityDAOImpl">
<ref bean="tactivityDAOImpl"/>
</property>
</bean>
</beans>