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>