Possibly consider using a shorter maxLifetime value.解决方法

【现象】

2022-08-24 14:54:49.130  WARN 174160 --- [nio-8082-exec-3] com.zaxxer.hikari.pool.PoolBase          : HikariPool-1 - Failed to validate connection com.mysql.cj.jdbc.ConnectionImpl@7df9ca28 (No operations allowed after connection closed.). Possibly consider using a shorter maxLifetime value.2022-08-24 14:54:54.146  WARN 174160 --- [nio-8082-exec-3] com.zaxxer.hikari.pool.PoolBase          : HikariPool-1 - Failed to validate connection com.mysql.cj.jdbc.ConnectionImpl@7150aa4 (No operations allowed after connection closed.). Possibly consider using a shorter maxLifetime value.2022-08-24 14:54:54.154  WARN 174160 --- [nio-8082-exec-2] com.zaxxer.hikari.pool.PoolBase          : HikariPool-1 - Failed to validate connection com.mysql.cj.jdbc.ConnectionImpl@16c7f560 (No operations allowed after connection closed.). Possibly consider using a shorter maxLifetime value.

【解决方法】

spring:datasource:driver-class-name: com.mysql.cj.jdbc.Driverurl: jdbc:mysql://localhost:3306/user?useUnicode=true&characterEncoding=utf-8&useSSL=true&serverTimezone=UTCusername: rootpassword: root

修改为：

spring:datasource:driver-class-name: com.mysql.cj.jdbc.Driverurl: jdbc:mysql://localhost:3306/user?useUnicode=true&characterEncoding=utf-8&useSSL=true&serverTimezone=UTCusername: rootpassword: roothikari:connection-timeout: 10000validation-timeout: 3000idle-timeout: 60000login-timeout: 5max-lifetime: 60000maximum-pool-size: 10minimum-idle: 5read-only: false

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