RestClient，离谱的报错

ES中是使用RestClient进行新增文档出错

先想到是RestClient中的逻辑错误，完全没想到配配置文件错误。

自己的错误问题

由于没有看下面报错，说数据库没有连接，也不至于去找逻辑错误。

### Error querying database.  Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
### The error may exist in cn/itcast/hotel/mapper/HotelMapper.java (best guess)
### The error may involve cn.itcast.hotel.mapper.HotelMapper.selectById
### The error occurred while executing a query
### Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure

错误

server:
  port: 8089
spring:
  datasource:
    url: jdbc:mysql://mysql:3306/heima?useSSL=false
    username: root
    password: 123456
#    driver-class-name: com.mysql.cj.jdbc.Driver
    driver-class-name: com.mysql.jdbc.Driver
logging:
  level:
    cn.itcast: debug
  pattern:
    dateformat: MM-dd HH:mm:ss:SSS
mybatis-plus:
  configuration:
    map-underscore-to-camel-case: true
  type-aliases-package: cn.itcast.hotel.pojo

修改

server:
  port: 8089
spring:
  datasource:
    url: jdbc:mysql://localhost:3306/heima?useSSL=false
    username: root
    password: 123456
#    driver-class-name: com.mysql.cj.jdbc.Driver
    driver-class-name: com.mysql.jdbc.Driver
logging:
  level:
    cn.itcast: debug
  pattern:
    dateformat: MM-dd HH:mm:ss:SSS
mybatis-plus:
  configuration:
    map-underscore-to-camel-case: true
  type-aliases-package: cn.itcast.hotel.pojo

纯纯粗心，不带一点狡辩的