Document root element "configuration", must match DOCTYPE root "mapper".

最近剛剛鼓搗mybatis , 第一個demo就出了問題.其實原因是因為將mapper中的頭copy到了configuration里去了

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">

其實configuration的頭應該是這樣的

<?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">