Attribute "resource" must be declared for element type "mapper"
为什么resource这里会出错
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<environments default="mysql_developer">
<environment id="mysql_developer">
<transactionManager type="jdbc"/>
<dataSource type="pooled">
<property name="driver" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/mybatis"/>
<property name="username" value="root"/>
<property name="password" value="123456"/>
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource="Nov18/service/usermapper.xml" />
</mappers>
</configuration>