原始配置：

type: com.alibaba.druid.pool.DruidDataSource
druid:initial-size: 5max-active: 25min-idle: 5max-wait: 10000testWhileIdle: truetestOnBorrow: falsetestOnReturn: falsetimeBetweenEvictionRunsMillis: 2000minEvictableIdleTimeMillis: 600000maxEvictableIdleTimeMillis: 900000validationQuery: SELECT 1 FROM DUAL

修改后配置：增加keep-alive: true即可

type: com.alibaba.druid.pool.DruidDataSource
druid:initial-size: 5max-active: 25min-idle: 5max-wait: 10000testWhileIdle: truetestOnBorrow: falsetestOnReturn: falsetimeBetweenEvictionRunsMillis: 2000minEvictableIdleTimeMillis: 600000maxEvictableIdleTimeMillis: 900000validationQuery: SELECT 1 FROM DUALkeep-alive: true

 

需要升级Druid版本到1.1.16之后，大于1.1.16版本，我升级到了1.1.17

https://mvnrepository.com/artifact/com.alibaba/druid-spring-boot-starter

<dependency><groupId>com.alibaba</groupId><artifactId>druid-spring-boot-starter</artifactId><version>1.1.17</version>
</dependency>

keep-alive配置建议参考：https://github.com/alibaba/druid/wiki/DruidDataSource%E9%85%8D%E7%BD%AE