Replace the driver version. The local mysql version is version8.0.21. Replace the jar version of the driver connected to mysql 8 or later and restart the system
Successful restart after replacement:
Note that the mysql version corresponds to the mysql driver version
Com.mysql.jdbc.driver is available in mysql-connector-java 5. Com.mysql.cj.jdbc.driver is available in mysql-connector-java version 6. Mysql-connector-java 5.1.32 (5 +) driver can also connect to mysql 8.x