mybatis空指针

session.close();报空指针一班是配置文件写错了，或者basedao写错

<?xml version="1.0" encoding="UTF-8" ?>

	 <environment id="development">
	 <transactionManager type="JDBC">
	 </transactionManager>
	   <dataSource type="POOLED">
	  	<property name="driver" value="${driver}"/>
	  	<property name="url" value="${url}"/>
	  	<property name="username" value="${user}"/>
	    <property name="password" value="${password}"/>
	   </dataSource>
	 </environment>
	</environments>
	<mappers>
	<package name="cn.smbms.dao.provider"/>
	
	</mappers>

（"cn.smbms.dao.provider.ProviderDao这里不要用斜杠*）

<select id="getProviderList" resultType="Provider">
  select * from smbms_provider
</select>