mysql-connector-java之6.0.6版本，SQLNonTransientConnectionException: CLIENT_PLUGIN_AUTH is required异常问题

    2018.01.08晚上发了一个进度可视化的需求，次日早上来发现钉钉有请求错误异常报警，我擦，什么鬼，吓出一身😓！因而，打开线上日志，发现4台服务器每秒钟都在报好几回数据库链接异常，异常以下：

019-01-09 10:07:49,224 [Druid-ConnectionPool-Create-12407003] ERROR com.alibaba.druid.pool.DruidDataSource - create connection SQLException, url: jdbc:mysql://1.1.1.1:3306/database?useUnicode=true&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull&serverTimezone=Asia/Shanghai, errorCode 0, state 08001
java.sql.SQLNonTransientConnectionException: CLIENT_PLUGIN_AUTH is required
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:526)
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:513)
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:505)
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:479)
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:489)
	at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:72)
	at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:1606)
	at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:633)
	at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:347)
	at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:219)
	at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:149)
	at com.alibaba.druid.filter.stat.StatFilter.connection_connect(StatFilter.java:218)
	at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:143)
	at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1470)
	at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1533)
	at com.alibaba.druid.pool.DruidDataSource$CreateConnectionThread.run(DruidDataSource.java:2333)
Caused by: com.mysql.cj.core.exceptions.UnableToConnectException: CLIENT_PLUGIN_AUTH is required
	at sun.reflect.GeneratedConstructorAccessor119.newInstance(Unknown Source)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at com.mysql.cj.core.exceptions.ExceptionFactory.createException(ExceptionFactory.java:54)
	at com.mysql.cj.core.exceptions.ExceptionFactory.createException(ExceptionFactory.java:73)
	at com.mysql.cj.mysqla.io.MysqlaProtocol.rejectConnection(MysqlaProtocol.java:327)
	at com.mysql.cj.mysqla.authentication.MysqlaAuthenticationProvider.connect(MysqlaAuthenticationProvider.java:207)
	at com.mysql.cj.mysqla.io.MysqlaProtocol.connect(MysqlaProtocol.java:1414)
	at com.mysql.cj.mysqla.MysqlaSession.connect(MysqlaSession.java:132)
	at com.mysql.cj.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:1726)
	at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:1596)
	... 9 common frames omitted
2019-01-09 10:07:49,725 [Druid-ConnectionPool-Create-12407003] ERROR com.alibaba.druid.pool.DruidDataSource - create connection SQLException, url: jdbc:mysql://1.1.1.1:3306/database?useUnicode=true&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull&serverTimezone=Asia/Shanghai, errorCode 0, state 08001
java.sql.SQLNonTransientConnectionException: CLIENT_PLUGIN_AUTH is required
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:526)
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:513)
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:505)
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:479)
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:489)
	at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:72)
	at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:1606)
	at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:633)
	at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:347)
	at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:219)
	at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:149)
	at com.alibaba.druid.filter.stat.StatFilter.connection_connect(StatFilter.java:218)
	at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:143)
	at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1470)
	at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1533)
	at com.alibaba.druid.pool.DruidDataSource$CreateConnectionThread.run(DruidDataSource.java:2333)
Caused by: com.mysql.cj.core.exceptions.UnableToConnectException: CLIENT_PLUGIN_AUTH is required
	at sun.reflect.GeneratedConstructorAccessor119.newInstance(Unknown Source)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at com.mysql.cj.core.exceptions.ExceptionFactory.createException(ExceptionFactory.java:54)
	at com.mysql.cj.core.exceptions.ExceptionFactory.createException(ExceptionFactory.java:73)
	at com.mysql.cj.mysqla.io.MysqlaProtocol.rejectConnection(MysqlaProtocol.java:327)
	at com.mysql.cj.mysqla.authentication.MysqlaAuthenticationProvider.connect(MysqlaAuthenticationProvider.java:207)
	at com.mysql.cj.mysqla.io.MysqlaProtocol.connect(MysqlaProtocol.java:1414)
	at com.mysql.cj.mysqla.MysqlaSession.connect(MysqlaSession.java:132)
	at com.mysql.cj.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:1726)
	at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:1596)
	... 9 common frames omitted

    顿时慌得一批啊，而后开始了各类猜测，通过一波查资料，找到临时解决方案，须要将mysql-connector-java的版本由6.0.6降到5.1.x版本，而后开始各类验证，发现mysql-connector-java的版本其实在08年4月份的时候就已经升级到6.0.6版本了，并且在测试环境上并无该问题。

    放一放吧，先解决线上问题，在本地将数据库驱动版本降到5.1.34后测试没有问题，因而勇敢的发到生产环境上，否则担忧影响其余业务正常流转。发到生产上通过验证和查看服务器日志发现没有问题了，但是这是什么缘由致使的呢？

    通过思考和查询相关mysql-connector-java驱动说明，发现驱动和mysql数据库的版本也有关系，因而去验证这个猜测。因为可视化需求新增了不少新的数据源，因而先去测试环境查询下新加的数据源中数据库的版本，发现测试环境数据库的版本为5.5.36-log，再去生产环境查询报错数据库的版本居然是5.1.42-log,好像发现了问题所在，可是感受还不够有说服力，因而查询了可视化这个项目生产环境之前链接数据库版本为5.7.21-log，因此那时数据库驱动升级到6.0.6是没有问题的，感受还差点，而后接着去查询本次新加数据源对接项目的mysql-connector-java版本，以下图：如今貌似能够说明该问题了，Mysql的驱动版本升级确实是创建在数据库版本之上的。

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mysql官网驱动版本和数据库版本说明，地址：https://dev.mysql.com/doc/connector-j/8.0/en/connector-j-versions.html