Result Maps collection does not contain value for XXX 错误

Mybatis报错如下：

2020-05-14 11:56:25.887 ERROR 40074 --- [nio-8080-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.builder.IncompleteElementException: **Could not find result map com.sukai.entity.Student] with root cause**

java.lang.IllegalArgumentException: Result Maps collection does not contain value for com.sukai.entity.Student

image-20200514115930804

• 错误原因： resultMap和resultType弄混淆了
  • resultMap：需要指明id和返回类型以及表字段的对应关系
  • resultType：返回一个自定义的实体类型，如图的com.sukai.entity.student
• 解决方案： 把resultMap修改为resultType