mysql-connector-java之6.0.6版本，SQLNonTransientConnectionException: CLIENT_PLUGIN_AUTH is required異常問題

    2018.01.08晚上發了一個進度可視化的需求，次日早上來發現釘釘有請求錯誤異常報警，我擦，什麼鬼，嚇出一身😓！因而，打開線上日誌，發現4臺服務器每秒鐘都在報好幾回數據庫鏈接異常，異常以下：

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

    頓時慌得一批啊，而後開始了各類猜測，通過一波查資料，找到臨時解決方案，須要將mysql-connector-java的版本由6.0.6降到5.1.x版本，而後開始各類驗證，發現mysql-connector-java的版本其實在08年4月份的時候就已經升級到6.0.6版本了，並且在測試環境上並無該問題。

    放一放吧，先解決線上問題，在本地將數據庫驅動版本降到5.1.34後測試沒有問題，因而勇敢的發到生產環境上，否則擔憂影響其餘業務正常流轉。發到生產上通過驗證和查看服務器日誌發現沒有問題了，但是這是什麼緣由致使的呢？

    通過思考和查詢相關mysql-connector-java驅動說明，發現驅動和mysql數據庫的版本也有關係，因而去驗證這個猜測。因爲可視化需求新增了不少新的數據源，因而先去測試環境查詢下新加的數據源中數據庫的版本，發現測試環境數據庫的版本爲5.5.36-log，再去生產環境查詢報錯數據庫的版本居然是5.1.42-log,好像發現了問題所在，可是感受還不夠有說服力，因而查詢了可視化這個項目生產環境之前鏈接數據庫版本爲5.7.21-log，因此那時數據庫驅動升級到6.0.6是沒有問題的，感受還差點，而後接着去查詢本次新加數據源對接項目的mysql-connector-java版本，以下圖：如今貌似能夠說明該問題了，Mysql的驅動版本升級確實是創建在數據庫版本之上的。

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mysql官網驅動版本和數據庫版本說明，地址：https://dev.mysql.com/doc/connector-j/8.0/en/connector-j-versions.html