使用Spring对iBatis的支持类时出错

我用Spring的context来指定数据源，然后在Dao对象中继承SqlMapClientDaoSupport，运行的时候总是提示：no SqlMapClient special，请问是什么原因造成的？

spring的配置文件如下：
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN" "http://www.springframework.org/dtd/spring-beans-2.0.dtd">

<beans>
<!-- 加载外部属性配置文件 -->
<bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="locations">
<list>
<value>WEB-INF/jdbc.properties</value>
</list>
</property>
</bean>

<!-- 配置数据源 -->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="${jdbc.driverClassName}"/>
<property name="url" value="${jdbc.url}"/>
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
</bean>

<!-- 配置事务管理 -->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"/>
</bean>

<!-- 配置SqlMapClient -->
<bean id="sqlMapClient" class="org.springframework.orm.ibatis.SqlMapClientFactoryBean">
<property name="configLocation" value="WEB-INF/sql-map-config.xml"/>
<property name="dataSource" ref="dataSource"/>
</bean>
……

<!-- 配置DAO对象 -->
<bean id="userDao" class="com.example.dao.SqlMapUserDao">
<property name="sqlMapClient" ref="sqlMapClient"/>
</bean>
</beans>

userDao代码如下：
import org.springframework.dao.DataAccessException;
import org.springframework.orm.ibatis.support.SqlMapClientDaoSupport;

public class SqlMapUserDao extends SqlMapClientDaoSupport
{
public void insertUser(User user)
{
try
{
getSqlMapClientTemplate().update("insertUser", user);
}
catch (DataAccessException e)
{
e.printStackTrace();
}
}
}

<bean id="sqlMapClient" class="org.springframework.orm.ibatis.SqlMapClientFactoryBean">
   <property name="configLocation">
	<value>classpath:SqlMapConfig.xml</value>
   </property>
   <property name="dataSource">
	<ref bean="dataSource"/>
   </property>
</bean>	

楼上的朋友，还是不行，仍然报相同的错误，就是找不到SqlMapClient……