CommunicationsException: Communications link failure [How to Solve]

Today, when I was learning mybatis, I always reported an error when executing the query operation! The error is as follows:

com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

It probably means that there is a problem with the database connection. After checking the database name, user name and password, there are no errors. Some blogs say that they need to change the MySQL configuration file. I really think it’s too troublesome to change


A blog commented that if MySQL is version 8.0 or above, usessl in the configuration should be set to false
and then it will be


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