项目启动不报错，如果静默15分钟没有数据库操作就报上述错误WARN 不影响程序运行
Failed to validate connection com.mysql.cj.jdbc.ConnectionImpl@16244d67 (No operations allowed after connection closed.). Possibly consider using a shorter maxLifetime value.
发现SpringBoot2开始配置文件有所变化
spring:
#数据库
datasource:
url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&serverTimezone=UTC
password: root
username: root
driver-class-name: com.mysql.cj.jdbc.Driver
hikari:
max-lifetime: 30000 # 不能小于30秒，否则默认回到1800秒
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