com.mysql.jdbc.exceptions.jdbc4.CommunicationsException:Communications link failure The last packet sent successfully to the server was0milliseconds ago.The driver has not received any packets from the server.at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)at sun.reflect.NativeConstr...
2、没办法,只能修改MySQL的参数了,wait_timeout最大为31536000即1年。 在my.cnf中加入: [mysqld] wait_timeout=31536000 interactive_timeout=31536000 重启生效,需要同时修改这两个参数。 3、给你需要执行的逻辑重新分配一个线程处理,根据自身业务逻辑进行处理。
最近在家里捣鼓一个公司自己搭建的demo的时候,发现程序一启动就会出现CommunicationsException: Communications link failure错误,经过一番排查最后发现是数据库url写错造成的,这个过程中也对出现这个错误的解决思路有了一些自己的理解,现和大家分享。该错误的具体信息如下: com.mysql.jdbc.exceptions.jdbc4.CommunicationsExcep...
com.mysql.jdbc.exceptions .jdbc4.CommunicationsException: Communications link failure 1 MySQL Communications link failure due to underlying exception 2 Java2MySQL > Communication link failure due to underlying exception again 0 Java MySQL JDBC Communication link failure 2 How do I resolve this ...
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failureThe last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server. at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ...
Class.forName("com.mysql.cj.jdbc.Driver"); 1. 报错信息3:SQLException: Table ‘your_table’ doesn’t exist 这个错误通常表示查询的表在数据库中不存在。这可能是由于以下原因导致的: 表名错误。我们需要确保查询的表名与数据库中的表名完全一致,包括大小写。
1. Communications link failure或The driver has not received any packets from the server 可能原因: a: url配置问题(包括useSSL,时区或编码方式等的配置) 解决方法: url: jdbc:mysql://远程ip:3306/数据库名称?useUnicode=true&useSSL=false&serverTimezone=GMT&characterEncoding=UTF-8 ...
I've installed MySQL on my server (CentOS 7), I'm able to connect with my DB via shell or MySQL Workbench but when I'm trying to run my Java app, then I'm getting errors like these: com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure The last packet sent...
就是普通的查询mysql数据库的代码: 错误栈如下: 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. at sun.reflect.NativeConstructorAccessor...
Communications link failure的解决办法 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_time...