是由于mysql驱动版本太低导致。

本人 jdk版本是1.8.0_211,mysql版本是8.0.17,mysql-connector-java版本是5.1.39,

后来把mysql-connector-java改为最新版mysql-connector-java-8.0.17.jar后,运行成功。

pom文件为:

    <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.17</version>
</dependency>

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