org.hibernate.exception.GenericJDBCException: could not load an entity:

hibernate reported an error, found that the entity class is no problem, the database has data. And the database data can be checked out. Tried a lot of methods, and then the version number of mysql is missing, select version(). I feel that the driver is not used correctly. I found the latest mysql 5 driver and put it on it, and it was solved. . .