Mapped Statements collection does not contain value for后面是什么类什么方法之类的：
错误原因有几种：
1、mapper.xml中没有加入namespace
2、mapper.xml中的方法和接口mapper的方法不对应
3、mapper.xml没有加入到mybatis-config.xml中(即总的配置文件)，例外：配置了mapper文件的包路径的除外
4、mapper.xml文件名和所写的mapper名称不相同。
信息来源：http://your233.iteye.com/blog/1563240
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