Spring boot项目长时间不进行接口操作，解决HikariPool-1提示

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问题描述

Springboot项目长时间没运行我运行的时候一直报错，导致接口调用失败

2021-02-23 18:13:23.044  WARN 13564 --- [nio-8088-exec-7] com.zaxxer.hikari.pool.PoolBase          : HikariPool-1 - Failed to validate connection com.mysql.cj.jdbc.ConnectionImpl@6f72819 (No operations allowed after connection closed.). Possibly consider using a shorter maxLifetime value.
2021-02-23 18:13:28.050  WARN 13564 --- [nio-8088-exec-7] com.zaxxer.hikari.pool.PoolBase          : HikariPool-1 - Failed to validate connection com.mysql.cj.jdbc.ConnectionImpl@77ead82b (No operations allowed after connection closed.). Possibly consider using a shorter maxLifetime value.
2021-02-23 18:13:33.071  WARN 13564 --- [nio-8088-exec-7] com.zaxxer.hikari.pool.PoolBase          : HikariPool-1 - Failed to validate connection com.mysql.cj.jdbc.ConnectionImpl@2254d332 (No operations allowed after connection closed.). Possibly consider using a shorter maxLifetime value.
2021-02-23 18:13:38.084  WARN 13564 --- [nio-8088-exec-7] com.zaxxer.hikari.pool.PoolBase          : HikariPool-1 - Failed to validate connection com.mysql.cj.jdbc.ConnectionImpl@1b8bc28a (No operations allowed after connection closed.). Possibly consider using a shorter maxLifetime value.
2021-02-23 18:13:43.104  WARN 13564 --- [nio-8088-exec-7] com.zaxxer.hikari.pool.PoolBase          : HikariPool-1 - Failed to validate connection com.mysql.cj.jdbc.ConnectionImpl@665c333f (No operations allowed after connection closed.). Possibly consider using a shorter maxLifetime value.
2021-02-23 18:13:48.118  WARN 13564 --- [nio-8088-exec-7] com.zaxxer.hikari.pool.PoolBase          : HikariPool-1 - Failed to validate connection com.mysql.cj.jdbc.ConnectionImpl@12452c08 (No operations allowed after connection closed.). Possibly consider using a shorter maxLifetime value.
2021-02-23 18:13:48.140 ERROR 13564 --- [nio-8088-exec-7] c.e.a.p.e.CustomExceptionHandler         : [ 系统异常 ]{}

org.springframework.transaction.CannotCreateTransactionException: Could not open JDBC Connection for transaction; nested exception is java.sql.SQLTransientConnectionException: HikariPool-1 - Connection is not available, request timed out after 30100ms.

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一、解决方法

配置文件中加入
minimum-idle最小空闲数
maximum-pool-size链接池最大数量
max-lifetime最大时长，配置为0则是永久不过期

spring.datasource.hikari.minimum-idle=3
spring.datasource.hikari.maximum-pool-size=5
spring.datasource.hikari.max-lifetime=0

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总结

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