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数据库连接异常: HikariPool-1 - Connection is not available, request timed out after 30000ms.

记一次生产环境数据库连接数导致的报错问题:FailedtoobtainJDBCConnection;nestedexceptionisjava.sql.SQLTransientConnectionException:HikariPool-1-Connectionisnotavailable,requesttimedoutafter30000ms.1.复现,定时任务失败会有错误邮件提醒,每天的七点左右就会有大量定时任务失败,报错为数据库连接超时,此时页面也无法访问,提示异常。大概持续时间为20min,过后又一切正常 2.原因:联系运维同事,发现数据库并无异常。所以大概是请求量太高导致数据库连接数

报错:The following signatures couldn‘t be verified because the public key is not available: NO_PUBKEY

aptupdate最后报错$sudoaptupdate报错......91packagescanbeupgraded.Run'aptlist--upgradable'toseethem.W:Anerroroccurredduringthesignatureverification.Therepositoryisnotupdatedandthepreviousindexfileswillbeused.GPGerror:http://repo.mysql.com/apt/ubuntufocalInRelease:Thefollowingsignaturescouldn'tbeverifiedbec

报错:The following signatures couldn‘t be verified because the public key is not available: NO_PUBKEY

aptupdate最后报错$sudoaptupdate报错......91packagescanbeupgraded.Run'aptlist--upgradable'toseethem.W:Anerroroccurredduringthesignatureverification.Therepositoryisnotupdatedandthepreviousindexfileswillbeused.GPGerror:http://repo.mysql.com/apt/ubuntufocalInRelease:Thefollowingsignaturescouldn'tbeverifiedbec

安装python -m pip install openpyxl 类库报错,A new release of pip available

问题二:安装python-mpip install  openpyxl类库报错,Anewreleaseofpipavailable:22.2.2->22.3.1【问题描述】安装python-mpip install  openpyxl类库报错,Anewreleaseofpipavailable:22.2.2->22.3.1(venv)D:\learnworkspace\python-learn\python-base>python-mpip install  openpyxlCollectingopenpyxl  Downloadingopenpyxl-3.0.10-py2.py3-none-

安装python -m pip install openpyxl 类库报错,A new release of pip available

问题二:安装python-mpip install  openpyxl类库报错,Anewreleaseofpipavailable:22.2.2->22.3.1【问题描述】安装python-mpip install  openpyxl类库报错,Anewreleaseofpipavailable:22.2.2->22.3.1(venv)D:\learnworkspace\python-learn\python-base>python-mpip install  openpyxlCollectingopenpyxl  Downloadingopenpyxl-3.0.10-py2.py3-none-

kafka报错: (localhost/127.0.0.1:9092) could not be established. Broker may not be available.

具体报错:[ProducerclientId=console-producer]Connectiontonode-1(localhost/127.0.0.1:9092)couldnotbeestablished.Brokermaynotbeavailable.(org.apache.kafka.clients.NetworkClient)使用的指令:之后输入数据回车报错./bin/kafka-console-producer.sh--broker-listlocalhost:9092--topicclicks看了下相关配置文件[root@masterkafka]#catconfig/serve

Authorization not available. Check if polkit service is running or see debug message for more inform

问题在CentOS想使用Docker,但是安装完后Docker客户端无法连接到Docker守护进程输入:systemctlstatusdocker显示:Authorizationnotavailable.Checkifpolkitserviceisrunningorseedebugmessageformoreinformation.通过询问chatGPT和搜索各种博客以及csdn,均无法解决问题解决1、重新安装polkit服务(可选)卸载旧版本的polkit:sudoyumremovepolkit清除旧版本的polkit数据:sudorm-rf/var/lib/polkit-1/安装新版本的p

ios - Xcode 9.1 Swift 4,如果使用 "if#available",则无法使用 NSDocumentTypeDocumentAttribute 进行编译

您好,我的应用程序在部署目标设置中以iOS8.2为目标。我试图将应用程序从swift3转换为swift4。它可以工作,但不能在iPhone5siOS8.4的模拟器中工作。问题是这样的:cell.lblHeader.attributedText=tryNSAttributedString(data:htmlData,options:[NSDocumentTypeDocumentAttribute:NSHTMLTextDocumentType],documentAttributes:nil)所以我尝试了这个:if#available(iOS11,*){cell.lblHeader.attr

ios - Xcode 9.1 Swift 4,如果使用 "if#available",则无法使用 NSDocumentTypeDocumentAttribute 进行编译

您好,我的应用程序在部署目标设置中以iOS8.2为目标。我试图将应用程序从swift3转换为swift4。它可以工作,但不能在iPhone5siOS8.4的模拟器中工作。问题是这样的:cell.lblHeader.attributedText=tryNSAttributedString(data:htmlData,options:[NSDocumentTypeDocumentAttribute:NSHTMLTextDocumentType],documentAttributes:nil)所以我尝试了这个:if#available(iOS11,*){cell.lblHeader.attr

全网多种方式解决The requested resource [/] is not available的错误

文章目录1.复现错误2.分析错误3.解决错误3.1本地项目3.2线上项目4.此错误的其他解决方法1.复现错误曾记得,当初使用idea来写Javaweb项目时,常常因为Tomcat配置导致如下错误:即Therequestedresource[/]isnotavailable问题。2.分析错误正赶上最近ChatGPT很火,于是借助ChatGPT来解决我的问题,如下所示:TherequestedresourceisnotavailableTherequestedresourcemaybeunavailableduetoavarietyofreasons.Itmayhavebeenremoved,ch