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

  1.   <dependency>
  2.             <groupId>mysql</groupId>
  3.             <artifactId>mysql-connector-java</artifactId>
  4.             <version>5.1.6</version>
  5.         </dependency>


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原文地址：https://www.cnblogs.com/signheart/p/f2c25d04b8cda06b8d053bb37d358164.html