Mysql连接失效

报错信息为

HikariPool-1 - Failed to validate connection com.mysql.cj.jdbc.ConnectionImpl@23513b4a (No operations allowed after connection closed.). Possibly consider using a shorter maxLifetime value.

解决方法：

spring:
  datasource:
    hikari:
      max-lifetime: 550000 # 单位是毫秒（550 秒）