No identifier specified for entity solution

problem ： stay springboot The integration of JPA May come across “No Identifier specified for entity” That is, there is no error identifying the entity class
terms of settlement ： 

①, Check whether you write the following comments in entity class red ：

 ②, Note that the package on which the above annotation depends must be ：（ Maybe I'm quick , direct alt+ctrl, for example Id Annotations in spring framake There are also ）           

import javax.persistence.*;

③, If none of the above is a problem , It is likely that this is a mistake caused , The root is not here , So we should continue to trace the source , See more error messages given by the console