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…

解决方案 连接Mysql报错 The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server. 检查mysql服务是否开启…

现象: 报错:Exception in thread "main" com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure 解决办法: 更换 mysql-connector-java-8.0.11.jar 为 mysql-connector-java-8.0.16.jar, 下载位置:https://mvnrepository.com/artifact/mysql/mysql-c…

详细报错 java.sql.SQLException: The server time zone value '�й���׼ʱ��' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the serverTimezone configuration property) to use a more specifc time z…

-- 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…

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…

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…

Cause: com.mysql.cj.jdbc.exceptions.MysqlDataTruncation: Data truncation: Incorrect date value: '1541123218569' for column 'create_time' at row 1 遇到这种问题的原因有两种 1.可能是表中设置的字符集与你想要插入的字符集不相同. 解决方法: (1)修改数据库默认编码ALTER DATABASE `test` DEFAULT CHARACTER SET u…

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…