ibatis创建SqlMapClient对象报错！该怎么解决

ibatis创建SqlMapClient对象报错！
String resource="sql-map-config.xml";
Reader reader;
try {
reader=Resources.getResourceAsReader(resource);
SqlMapClient sqlMap=SqlMapClientBuilder.buildSqlMapClient(reader);
}catch(IOException e)
{
e.printStackTrace();
}
在新建sqlMap对象时报错：
java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory

求教！！！

------解决方案--------------------

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String resource="sql-map-config.xml";
Reader reader;
try {
reader=Resources.getResourceAsReader(resource);
SqlMapClient sqlMap=SqlMapClientBuilder.buildSqlMapClient(reader);
}catch(IOException e)……

------解决方案--------------------
你没有引入commons-logging.jar包,当然找不到那个类了
------解决方案--------------------

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<typeAlias alias="caiXinBean" 这里没有空格，这里要隔开啊 type="entity.CaiXinBean"/>