本文是针对特定的情景下的特定错误,不是所有Communications link failure错误都是这个引起的,重要的区分特点是:程序是不是在卡主后两个小时(服务器的设置)后程序才感知到,才抛出了异常. 本文系转载,原文地址:https://jingyan.baidu.com/article/fc07f98922615a12ffe519ce.html 在公网,不同机房的环境下,相互访问数据库出现操作卡顿的情况,数据库会出现错误:java.sql.SQLException: Communica…

服务器环境中 JAVA 连接数据库 Communications link failure, Contection refused 网上很多这种情况,解决基本上是将127.0.0.1换成localhost 但是我这个比较傻b,原因也很无奈.值得纪念,以下是我解决的过程,过程还是值得学习的. 1.症状:java 连接数据库 访问拒绝 连接拒绝. 原因:基本上是围绕着 IP,PORT,DB,USERNAME,PASSWORD这几个参数,只能是这里出了问题. 过程:将127.0.0.1换成localh…

不多说,直接上干货! 问题详情 [hadoop@bigdatamaster oozie--cdh5.5.4]$ bin/ooziedb.sh create -sqlfile oozie.sql -run DB Connection [hadoop@bigdatamaster oozie--cdh5.5.4]$ bin/ooziedb.sh create -sqlfile oozie.sql -run DB Connection setting CATALINA_OPTS="$CATALINA_O…

异常描述 这个异常通常有如下信息: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure The last packet successfully received from the server was 59,977 milliseconds ago. The last packet sent successfully to the server was 1 millisecon…

很长的报错,截取   ERROR c.a.d.p.DruidDataSource - discard connection   com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure       The last packet successfully received from the server was 44,866 milliseconds ago. The last pac…

2019-11-22 17:15:27,705 FATAL [IPC Server handler 13 on 44844] org.apache.hadoop.mapred.TaskAttemptListenerImpl: Task: attempt_1574410493054_0011_m_000000_0 - exited : java.lang.RuntimeException: java.lang.RuntimeException: com.mysql.jdbc.exceptions.…

问题描述 App Service使用jdbc连接MySQL服务,出现大量的  Communications link failure: com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received…

09:00:30.307 [http-8080-6] ERROR org.hibernate.transaction.JDBCTransaction -JDBC begin failed com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure The last packet successfully received from the server was 56,237,340 mi…

-- 查询mysql 数据库链接空闲时间持有最大空闲时间,单位为秒 SHOW VARIABLES WHERE VAriable_name = 'interactive_timeout'; -- 会出现wait_timeout与该参数意思相近,修改时,一起修改 SHOW VARIABLES WHERE VAriable_name = '%timeout'; -- 解决问题 com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Commun…

# #错误日志 2016-11-10 16:19:20,834 ERROR [org.quartz.core.JobRunShell] - Job DEFAULT.jobtask threw an unhandled Exception: org.springframework.scheduling.quartz.JobMethodInvocationFailedException: Invocation of method 'execute' on target class [class co…