我要评论本地项目启动报错
记录一个比较坑的问题,由于mysql版本不同导致了项目启动失败，连接不到数据库等一系列问题。。。
报错原因：
com.alibaba.druid.pool.druiddatasource : init datasource error, url: jdbc:mysql://127.0.0.1:3306/cy_weroom?useunicode=true&characterencoding=utf-8&servertimezone=asia/shanghai
2022-10-07 13:49:34.804 error 25904 --- [ main] com.alibaba.druid.pool.druiddatasource : init datasource error, url: jdbc:mysql://127.0.0.1:3306/cy_weroom?useunicode=true&characterencoding=utf-8&servertimezone=asia/shanghai 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) at com.mysql.cj.jdbc.exceptions.sqlexceptionsmapping.translateexception(sqlexceptionsmapping.java:64) at com.mysql.cj.jdbc.connectionimpl.createnewio(connectionimpl.java:835) at com.mysql.cj.jdbc.connectionimpl.<init>(connectionimpl.java:455) at com.mysql.cj.jdbc.connectionimpl.getinstance(connectionimpl.java:240) at com.mysql.cj.jdbc.nonregisteringdriver.connect(nonregisteringdriver.java:199) at com.alibaba.druid.filter.filterchainimpl.connection_connect(filterchainimpl.java:156) at com.alibaba.druid.filter.stat.statfilter.connection_connect(statfilter.java:218) at com.alibaba.druid.filter.filterchainimpl.connection_connect(filterchainimpl.java:150) at com.alibaba.druid.pool.druidabstractdatasource.createphysicalconnection(druidabstractdatasource.java:1560) at com.alibaba.druid.pool.druidabstractdatasource.createphysicalconnection(druidabstractdatasource.java:1623) at com.alibaba.druid.pool.druiddatasource.init(druiddatasource.java:861) at sun.reflect.nativemethodaccessorimpl.invoke0(native method) at sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:62) at sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:43) at java.lang.reflect.method.invoke(method.java:498) at org.springframework.beans.factory.support.abstractautowirecapablebeanfactory.invokecustominitmethod(abstractautowirecapablebeanfactory.java:1904) at org.springframework.beans.factory.support.abstractautowirecapablebeanfactory.invokeinitmethods(abstractautowirecapablebeanfactory.java:1846) at org.springframework.beans.factory.support.abstractautowirecapablebeanfactory.initializebean(abstractautowirecapablebeanfactory.java:1774) at org.springframework.beans.factory.support.abstractautowirecapablebeanfactory.docreatebean(abstractautowirecapablebeanfactory.java:593) at org.springframework.beans.factory.support.abstractautowirecapablebeanfactory.createbean(abstractautowirecapablebeanfactory.java:515) at org.springframework.beans.factory.support.abstractbeanfactory.lambda$dogetbean$0(abstractbeanfactory.java:320) at org.springframework.beans.factory.support.defaultsingletonbeanregistry.getsingleton(defaultsingletonbeanregistry.java:222) at org.springframework.beans.factory.support.abstractbeanfactory.dogetbean(abstractbeanfactory.java:318) at org.springframework.beans.factory.support.abstractbeanfactory.getbean(abstractbeanfactory.java:199) at org.springframework.beans.factory.config.dependencydescriptor.resolvecandidate(dependencydescriptor.java:277) at org.springframework.beans.factory.support.defaultlistablebeanfactory.addcandidateentry(defaultlistablebeanfactory.java:1467) at org.springframework.beans.factory.support.defaultlistablebeanfactory.findautowirecandidates(defaultlistablebeanfactory.java:1431) at org.springframework.beans.factory.support.defaultlistablebeanfactory.resolvemultiplebeans(defaultlistablebeanfactory.java:1350) at org.springframework.beans.factory.support.defaultlistablebeanfactory.doresolvedependency(defaultlistablebeanfactory.java:1209) at org.springframework.beans.factory.support.defaultlistablebeanfactory.resolvedependency(defaultlistablebeanfactory.java:1171) at org.springframework.beans.factory.support.constructorresolver.resolveautowiredargument(constructorresolver.java:857) at org.springframework.beans.factory.support.constructorresolver.createargumentarray(constructorresolver.java:760) at org.springframework.beans.factory.support.constructorresolver.autowireconstructor(constructorresolver.java:218) at org.springframework.beans.factory.support.abstractautowirecapablebeanfactory.autowireconstructor(abstractautowirecapablebeanfactory.java:1341) at org.springframework.beans.factory.support.abstractautowirecapablebeanfactory.createbeaninstance(abstractautowirecapablebeanfactory.java:1187) at org.springframework.beans.factory.support.abstractautowirecapablebeanfactory.docreatebean(abstractautowirecapablebeanfactory.java:555) at org.springframework.beans.factory.support.abstractautowirecapablebeanfactory.createbean(abstractautowirecapablebeanfactory.java:515) at org.springframework.beans.factory.support.abstractbeanfactory.lambda$dogetbean$0(abstractbeanfactory.java:320)
我的容器版本mysql版本是5.7.39
本地mysql版本是5.7.20
本地可以但是，但是容器版本不行，于是就想到了是不是版本冲突的问题，因为报的是连接问题
这一段很关键，ssl连接问题，那就是版本问题了
caused by: javax.net.ssl.sslhandshakeexception: no appropriate protocol (protocol is disabled or cipher suites are inappropriate)
解决方案
问题搞清楚了，解决方案为两个
第一个：
在连接后面加上 &usessl=false
jdbc:mysql://127.0.0.1:3306/cy_weroom?useunicode=true&characterencoding=utf-8&servertimezone=asia/shanghai&usessl=false
第二种：
重新pull镜像源，如果不是镜像方式的，则统一版本就可以。
备注：网上扯的那一堆都没有用 wait_timeout=86400 还有时区问题的也是扯淡
容器启动mysql的坑
容器启动mysql的坑：mysql是容器版本启动的要注意挂载宿主机时区，不然默认是utc时区，需要修改时区为宿主机时区，主要会导致你插入的数据时间会比北京时间差8个小时，导致插入数据不对。
两种修改时区的方法：
启动容器时挂载宿主机时区
docker run -p 3306:3306 --name mymysql -v $pwd/conf:/etc/mysql/conf.d -v $pwd/logs:/logs -e tz=asia/shanghai -v $pwd/data:/var/lib/mysql -e mysql_root_password=123456 -d mysql:8.0
第二种进入容器内部修改
#进入容器 docker exec -it 容器名 /bin/bash #登录mysql mysql -uroot -p #设置时区 set global time_zone = '+8:00'; #立即生效 flush privileges; #查看时区 show variables like '%time_zone%';
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