错误代码：

2020-05-29 17:28:33.811 ERROR 10556 --- [nio-8010-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.imooc.dianping.dal.UserModelMapper.selectByPrimaryKey] with root cause

org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.imooc.dianping.dal.UserModelMapper.selectByPrimaryKey

访问user/test是正常的，访问user/get?id=1会报错，
userController中get方法参数也申明，UserModelMapper.xml通过检查也是编译了的，@responseBody注解也声明了， xml文件中的<mapper namespace="com.imooc.dianping.dal.UserModelMapper"> 和mapper接口文件路径相同，
这是在配置文件中的相关配置：

mybatis.mapper-locations= = classpath:mapping/*.xml

不知道问题出在哪里，请老师指点迷津