一、There is no getter for property named错误日志：

ERROR 11688 --- [nio-7001-exec-4] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : 
Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; 
nested exception is org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.reflection.ReflectionException:
There is no getter for property named 'index' in 'class java.lang.Long'] with root cause

org.apache.ibatis.reflection.ReflectionException: There is no getter for property named 'index' in 'class java.lang.Long'

报错是指：属性名称缺少getter方法

解法：Mapper接口中的参数添加@Param(“index”)

二、附加@Param常见用法

1.方法中有两个参数

如：where name= #{a} and categoryId= #{b}

2.方法参数名不同于数据库表里的参数名

在方法参数的前面写上@Param(“参数名”),表示给参数命名,名称就是括号中的内容