Mon Dec 14 11:33:56 CST 2020 WARN: Establishing SSL connection without
server’s identity verification is not recommended. According to MySQL
5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn’t set. For compliance
with existing applications not using SSL the verifyServerCertificate
property is set to ‘false’. You need either to explicitly disable SSL
by setting useSSL=false, or set useSSL=true and provide truststore for
server certificate verification.
Monday, December 14 11:33:56 CST 2020 Warning: It is not recommended to establish an SSL connection without server authentication. According to the requirements of MySQL 5.5.45+, 5.6.26+, and 5.7.6+, if no explicit options are set, an SSL connection must be established by default. In order to comply with existing applications that do not use SSL, the verifyServerCertificate property is set to "false". You need to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide a trust store for server certificate verification.
Solve the problem:
Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/mysql01?useUnicode=true&characterEncoding=utf-8&useSSL=false", "root", "root");