mysql 创建连接是 Cannot create PoolableConnectionFactory (Unknown character set: 'utf8mb4')

 Cannot create PoolableConnectionFactory (Unknown character set: 'utf8mb4')

maven 依赖换版本

  <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.6</version>
        </dependency>