Linux Start jar package error: Communications link failure
Error Messages:

com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure

create connection SQLException, url: jdbc:mysql://www.shaoming.com:3306/renren_security?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai, errorCode 0, state 08S01

Solution:

Modify the information of the database connection you had setted before.

url: jdbc:mysql://www.shaoming.com:3306/renren_security?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai

Modified data connection information

 url: jdbc:mysql://www.shaoming.com:3306/renren_security?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai&useSSL=false

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