In the integration SpringBoot Integrate MyBatis-Plus when , call selectById(id) When querying data, an error is reported

The page error message is ：

In fact, you can see from the background log information ：

You can see the prompt is ：

Warn: Could not find @TableId in Class: com.hlt.entity.User.

class com.hlt.entity.User ,Not found @TableId annotation, Cannot use Mybatis-Plus ‘xxById’ Method.

This is because when the table does not contain a primary key , Warning given

resolvent ： See if… Is set in this table id Primary key

                  See if the entity class is missing id Field

I am because I write less in entity class id Field , No mistake can be found everywhere , It turns out that there is something wrong with the entity class field .