Cannot create PoolableConnectionFactory (Could not create connection to database server.

1.版本改到最高

<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.11</version>
</dependency>

2.將jdbc.properties

driver=com.mysql.jdbc.Driver

url=jdbc:mysql://localhost:3306/waiter

改成

driver=com.mysql.cj.jdbc.Driver
url=jdbc:mysql://localhost:3306/waiter?useUnicode=true&characterEncoding=UTF-8&useSSL=false&autoReconnect=true&failOverReadOnly=false&serverTimezone=UTC