最近的一个项目在Hibernate使用C3P0的连接池,数据库为Mysql.开发测试没有问题,在运行中每个一段长的空闲时间就出现异常: java 代码 org.hibernate.exception.JDBCConnectionException: could not execute query at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:74) at org.hibernate.exce…

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…

DBCP连接池连接MySql数据库时,一奇葩数据库设置为30秒内无请求自动断开.超时后链接无法关闭,活动链接数飞奔,最后挂掉. 网上找了一圈,一般是这三种,方法一pass,方法二测试无效可能设置错了吧,再者本身30秒已经够短了,最后落在了方法三, BasicDataSource ds = new BasicDataSource();          ds.setTimeBetweenEvictionRunsMillis(1000*20);        ds.setTestWhileIdle(…

一是将 wait_timeout=31536000 interactive_timeout=31536000 将过期时间修改为1年. 二是在连接URL上添加参数:&autoReconnect=true&failOverReadOnly=false…

前端时间到客户那去进行项目的上线测试,将项目部署好之后,运行都是正常的,可是每到了第二天早上访问的时候,就会报一个Could not open Hibernate session for transaction 异常,Caused by: com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception,当时很摸不着头脑,后来就开始从数据库连接的源头开始找,本次项目中用的…

一.报错的问题: 测试环境在做压力测试的时候爆出错误 com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure INFO | jvm 1 | 2013/10/24 14:22:28 | INFO | jvm 1 | 2013/10/24 14:22:28 | The last packet successfully received from the server was 26,071…

# #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…

1 详细异常信息 ERROR yarn.ApplicationMaster: User class threw exception: java.sql.SQLException: Communications link failure The last packet successfully received from the server was 18,973 milliseconds ago. The last packet sent successfully to the server w…

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…

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…