[报错解决]Communications link failure

报错

主机IDEA项目连接虚拟机的数据库报错。

主要报错信息有:

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 any packets from the server.

.........

先排查基本问题。端口开启且没被占用、防火墙关闭了、数据库开启了,IDEA导出的Jar包在虚拟机中也没问题,所以只能是主机IDEA这边的项目代码或者是IDEA本身的问题。

整段报错信息有14万字。

只帖取部分具体报错信息。

具体报错:

2024-05-05 14:24:04.558 ERROR 4900 --- [ main] com.alibaba.druid.pool.DruidDataSource : init datasource error, url: jdbc:mysql://localhost:3306/student?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC

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 any packets from the server.

at com.mysql.cj.jdbc.exceptions.SQLError.createCommunicationsException(SQLError.java:174) ~[mysql-connector-java-8.0.16.jar:8.0.16]

at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:64) ~[mysql-connector-java-8.0.16.jar:8.0.16]

at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:835) ~[mysql-connector-java-8.0.16.jar:8.0.16]

at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:455) ~[mysql-connector-java-8.0.16.jar:8.0.16]

at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:240) ~[mysql-connector-java-8.0.16.jar:8.0.16]

at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:199) ~[mysql-connector-java-8.0.16.jar:8.0.16]

at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:148) ~[druid-1.0.28.jar:1.0.28]

at com.alibaba.druid.filter.FilterAdapter.connection_connect(FilterAdapter.java:785) ~[druid-1.0.28.jar:1.0.28]

at com.alibaba.druid.filter.FilterEventAdapter.connection_connect(FilterEventAdapter.java:38) ~[druid-1.0.28.jar:1.0.28]

at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:142) ~[druid-1.0.28.jar:1.0.28]

at com.alibaba.druid.filter.FilterAdapter.connection_connect(FilterAdapter.java:785) ~[druid-1.0.28.jar:1.0.28]

at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:142) ~[druid-1.0.28.jar:1.0.28]

at com.alibaba.druid.filter.stat.StatFilter.connection_connect(StatFilter.java:211) ~[druid-1.0.28.jar:1.0.28]

at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:142) ~[druid-1.0.28.jar:1.0.28]

at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1454) ~[druid-1.0.28.jar:1.0.28]

at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1516) ~[druid-1.0.28.jar:1.0.28]

具体报错:

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.

at jdk.internal.reflect.GeneratedConstructorAccessor42.newInstance(Unknown Source) ~[na:na]

at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:na]

at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499) ~[na:na]

at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:480) ~[na:na]

at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:61) ~[mysql-connector-java-8.0.16.jar:8.0.16]

at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:105) ~[mysql-connector-java-8.0.16.jar:8.0.16]

at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:151) ~[mysql-connector-java-8.0.16.jar:8.0.16]

at com.mysql.cj.exceptions.ExceptionFactory.createCommunicationsException(ExceptionFactory.java:167) ~[mysql-connector-java-8.0.16.jar:8.0.16]

at com.mysql.cj.protocol.a.NativeSocketConnection.connect(NativeSocketConnection.java:91) ~[mysql-connector-java-8.0.16.jar:8.0.16]

at com.mysql.cj.NativeSession.connect(NativeSession.java:152) ~[mysql-connector-java-8.0.16.jar:8.0.16]

at com.mysql.cj.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:955) ~[mysql-connector-java-8.0.16.jar:8.0.16]

at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:825) ~[mysql-connector-java-8.0.16.jar:8.0.16]

... 14 common frames omitted

Caused by: java.net.ConnectException: Connection refused: connect

at java.base/sun.nio.ch.Net.connect0(Native Method) ~[na:na]

at java.base/sun.nio.ch.Net.connect(Net.java:579) ~[na:na]

at java.base/sun.nio.ch.Net.connect(Net.java:568) ~[na:na]

at java.base/sun.nio.ch.NioSocketImpl.connect(NioSocketImpl.java:588) ~[na:na]

at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:327) ~[na:na]

at java.base/java.net.Socket.connect(Socket.java:633) ~[na:na]

at com.mysql.cj.protocol.StandardSocketFactory.connect(StandardSocketFactory.java:155) ~[mysql-connector-java-8.0.16.jar:8.0.16]

at com.mysql.cj.protocol.a.NativeSocketConnection.connect(NativeSocketConnection.java:65) ~[mysql-connector-java-8.0.16.jar:8.0.16]

... 17 common frames omitted

进程已结束,退出代码1

解决

1.找到项目的application-dev.yml配置文件,找到url

复制代码
url: jdbc:mysql://localhost:3306/student?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC

把其中的localhost修改为MySQL所在服务器的ip地址

修改完毕后如下图:

2.同样是application-dev.yml配置文件,找到username和password

复制代码
username: root
password:

把数据库密码填入password

修改完毕后如下图:

相关推荐
YuTaoShao1 小时前
【LeetCode 热题 100】56. 合并区间——排序+遍历
java·算法·leetcode·职场和发展
程序员张31 小时前
SpringBoot计时一次请求耗时
java·spring boot·后端
llwszx4 小时前
深入理解Java锁原理(一):偏向锁的设计原理与性能优化
java·spring··偏向锁
云泽野5 小时前
【Java|集合类】list遍历的6种方式
java·python·list
二进制person5 小时前
Java SE--方法的使用
java·开发语言·算法
小阳拱白菜6 小时前
java异常学习
java
FrankYoou7 小时前
Jenkins 与 GitLab CI/CD 的核心对比
java·docker
麦兜*8 小时前
Spring Boot启动优化7板斧(延迟初始化、组件扫描精准打击、JVM参数调优):砍掉70%启动时间的魔鬼实践
java·jvm·spring boot·后端·spring·spring cloud·系统架构
KK溜了溜了8 小时前
JAVA-springboot 整合Redis
java·spring boot·redis
天河归来8 小时前
使用idea创建springboot单体项目
java·spring boot·intellij-idea