使用Connector/J连接MySQL数据库,程序运行较长时间后就会报以下错误: Communications link failure,The last packet successfully received from the server was *** millisecond ago.The last packet successfully sent to the server was *** millisecond ago. 其中错误还会提示你修改wait_timeout或是使用Co…

[MySQL]JDBC连接MySQL的一些问题以及解决办法 http://blog.csdn.net/baofeidyz/article/details/52017047…

使用Connector/J连接MySQL数据库,程序运行较长时间后就会报以下错误: Communications link failure,The last packet successfully received from the server was *** millisecond ago.The last packet successfully sent to the server was ***  millisecond ago. 其中错误还会提示你修改wait_timeout或是使用C…

最近在用一个MySQL的Java连接池的过程中,连接一晚上不释放,第二天就会造成超时的错误,查了一下原因,原来是因为MySQL默认的空闲等待时间是8个小时,一旦空闲超过8个小时,就会抛出异常.异常文本如下: com.mysql.jdbc.CommunicationsException MESSAGE: Communications link failure due to underlying exception: ** BEGIN NESTED EXCEPTION ** java.net.Soc…

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…

数据库连接失败 一.例如我在SpringBoot项目中使用了阿里的数据库连接池Driud. 有次在启动的时候,会报这样的错: Caused by: com.mysql.cj.exceptions.CJCommunicationsException: Communications link failure The last packet successfully received from the server was 319 milliseconds ago. The last packet s…

问题现象 com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server. I spend some days to solve this…

一,异常现象 com.bill99.inf.ibatis.DBException: queryForList error::sqlId=orgOrderAssetsMapping.queryModelOrgOrderAssetsMapping param:com.bill99.boss.domain.org.model.OrderAssetsMapping@51ab0a47 at com.bill99.inf.ibatis.SqlMapDao.queryForList(SqlMapDao.jav…

想必大家在用MySQL时都会遇到连接超时的问题,如下图所示: 就是这个异常(com.mysql.jdbc.exceptions.jdbc4.Communication***ception:Communications link failure Last packet sent to the server was X ms ago),是由于MySQL服务在长时间不连接之后断开了,断开之后的首次请求会抛出这个异常.那么既然是连接超时的问题,就要去MySQL中探究一下连接时间是怎么控制的.打开MySQ…

MySQL默认一个连接空闲8小时候就会自动断开,而这时程序以为连接还能使用,然后在使用的时候就会出现Communications link failure异常. 这时需要进行两步设置,有时候只设置MySQL就可以了. 一.在MySQL的配置文件(linux配置文件是my.cnf,windows配置文件为my.ini)中添加以下两行(默认值为28800,下面的值代表一年.听说windows下的MySQL不支持一年,可以适当减少尝试) wait_timeout=31536000 interactiv…