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ERROR [Druid-ConnectionPool-Create-2074541388] - create connection error, url:jdbc:mysql://localhost:3306/ssmtest?characterEncoding=UTF-8, errorCode 0, state 08001 com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not createconnection to database server.at sun.reflect.GeneratedConstructorAccessor21.newInstance(Unknown Source)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)at java.lang.reflect.Constructor.newInstance(Unknown Source)at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)at com.mysql.jdbc.Util.getInstance(Util.java:386)at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1015)at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:989)at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:975)at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:920)at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2568)at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2304)at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:834)at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)at sun.reflect.GeneratedConstructorAccessor18.newInstance(Unknown Source)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)at java.lang.reflect.Constructor.newInstance(Unknown Source)at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:416)at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:346)at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1408)at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1464)at com.alibaba.druid.pool.DruidDataSource$CreateConnectionThread.run(DruidDataSource.java:1995) Caused by: java.lang.NullPointerExceptionat com.mysql.jdbc.ConnectionImpl.getServerCharacterEncoding(ConnectionImpl.java:3279)at com.mysql.jdbc.MysqlIO.sendConnectionAttributes(MysqlIO.java:1940)at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1866)at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1252)at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2486)at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2519)... 12 more

解決

這是因?yàn)楸镜氐膍ysql安裝的8.0，而項(xiàng)目所使用的驅(qū)動是5.1。

怎樣確認(rèn)？

首先查看本地mysql版本以及安裝路徑

打開桌面左下角搜索，輸入mysql，找到mysql *.* Command Line Client,這里是mysql 8.0 Command Line Client，

可見是安裝的mysql8.0

點(diǎn)擊后輸入密碼再輸入:

show variables like "%char%";

?

打開Maven項(xiàng)目目錄下的pom.xml,找到mysql的驅(qū)動依賴

原來是5.1.26的版本，現(xiàn)在將其改為8.0.11

為什么是8.0.11

到maven的中央倉庫中可以看到?jīng)]有版本8.0.0

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將pom.xml改過來之后，重啟服務(wù)器即可。

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