Spring异常 -- Invalid bound statement (not found): mybatis.mapper.UserMapper.findUserById

开发工具：idea

如果把xml中放到resource外面（这是老式的写法），比如

需要在pom.xml中配置如下内容，不然加载不到配置文件。

<resources>
      <resource>
          <directory>src/main/java</directory>
          <includes>
              <include>**/*.xml</include>
          </includes>
      </resource>
      <resource>
          <directory>src/main/source</directory>
          <includes>
              <include>**/*.*</include>
          </includes>
      </resource>
</resources>