今天访问已经架上服务器的网站,报错: Cause: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server was 78,050,512 milliseconds ago. The last packet sent successfully to the server was 78,050,512 milliseconds ago.…

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"> <property name="driverClassName" value="${jdbc.driverClassName}" /> <property name="url&quo…

tomcat+mysql部署,每天早晨第一次访问web项目,出现mysql的连接timeout异常:com.mysql.jdbc.exceptions.jdbc4.CommunicationsException或com.atomikos.datasource.ResourceException. ############################################################################ com.atomikos.datasource.…

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…

本文转自:http://blog.csdn.net/zmzsoftware/article/details/6835604 MySQL第二天早上第一次连接超时报错,解决方法com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link fa…

-- 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…

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…

1.使用sqoop技术将mysql的数据导入到Hive出现的错误如下所示: 第一次使用命令如下所示: [hadoop@slaver1 sqoop--cdh5.3.6]$ bin/sqoop import --connect jdbc:mysql://localhost:3306/test --username root --password 123456 --table tb_user --hive-import --m 1 Warning: /home/hadoop/soft/sqoop--c…

数据库 没有开启  连接失败 org.apache.ibatis.exceptions.PersistenceException: ### Error querying database. Cause: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure The last packet sent successfully to the server was 0 milliseco…

报错: MySQL第二天早上第一次连接超时报错, com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure 原因: 上述问题是由mysql5数据库的配置引起的.mysql5将其连接的等待时间(wait_timeout .interactive_timeout)缺省为8小时.在其客户程序中可以这样来查看其值: mysql> show global variables like 'wait…

现象:客户端连接服务器端mysql是没问题的,所有都木有问题,应用程序配置也没问题,但是连接就抛异常: 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 f…

最近在搞一个Spring boot + Mybatis + Mysql的项目,用Mybatis访问数据库时,报了如下的错误,先在网上搜索了,试了各种办法都不行, 奇葩的是,连接另外1个数据库又没问题.  最后发现是因为Mybatis的Mapper.xml文件中的SQL语句后面,多了个分号[;],导致SQL查询要等待很久,直到返回下面的报错. com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link f…

com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure 长时间没连接mysql断开了,重新启动就好了.…

MySQL第二天早上第一次连接超时报错,解决方法com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure Last packet sent to the server was 0 ms ago 最近碰到一个mysql5…

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.…

感谢大佬:https://blog.csdn.net/a704397849/article/details/93797529 springboot + mybatis多数据库 + druid连接池配置成功.正常运行后,访问第一个数据库后访问第二个数据库,再去访问第一个数据库 会报错: Error querying database. Cause: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications lin…

nested exception is org.apache.ibatis.exceptions.PersistenceException: ### Error querying database. Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is java.sql.SQLNonTransientConnectio…

jdbc驱动:mysql-connector-java-5.1.39-bin.jar 这个有问题, 换成:mysql-connector-java-5.1.34.jar 就可以了…

背景 使用sqoop从mysql导数据到hive,从本地服务器是可以访问mysql的(本地服务器是hadoop集群的一个datanode),但是sqoop导数据的时候依然连接不上mysql 报错如下: 从报错可以看出,是数据库连接失败,很常见的问题,但是从本地是可以直连mysql的. 因为sqoop导数据的时候,默认会启动4个map task,这4个map task会随机启动在不动的datanode上,所以在想,是不是因为其他节点没有权限访问mysql导致. 但是需要先搞清楚,sqoop在抽取数…

数据库服务没有开或者是驱动那块的问题…

1.首先检查生产环境的机器是否ping的通和telnet的通数据库 2.排查数据库连接的参数 3.看数据量是否很大 参考: http://blog.csdn.net/sclxf/article/details/5775125…

调试一个程序, 调试到一半, 下班回家, 程序卡在了某一行, 第二天早上回来一看, 发现了异常: Wed Sep :: GMT+: WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be establis…

今天在使用mysql数据库查找数据的时候报错,错误信息如下: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown column 'dd' in 'where clause' at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newI…

严重: Servlet.service() for servlet jsp threw exceptioncom.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown column '??????' in 'field list'    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)    at sun.reflect.Nati…

Exception in thread "main" com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '(3), primary key (ID_))…

Linux环境 Mysql+Hibernate command denied to user 错误 错误信息 如下: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: SELECT command denied to user 'XXX'@'XXX..XXX.XXX' for table 'XXX' 解决问题的方法: 1 可能是权限原因 2 如果权限没有问题,并且是使用hibernate框架的前提下.可能是你的xml映射文件或者…

这两天项目一直在报这个错误消息: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: SELECT command denied to user 'xxxxx'@'xxx.xxx.xxx.xxx' for table 'xxxxxx' at sun.reflect.GeneratedConstructorAccessor54.newInstance(Unknown Source) at sun.reflect.Delegating…

最近几天几天做项目用到了Spring Data JPA,确实是个好东西,省了很多力气.但是由于刚开始用,也遇到不少头疼的问题,如下,调用JpaRepository接口的save方法保存一个对象到数据库中的时候出错: ERROR: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table 'portal.hibernate_sequence' doesn't exist,  wqee 对这个问题可以说是几经磨难,一直想不通为何…