Unknown character set: 'utf8mb4' bug解决

本文介绍了解决在连接MySQL数据库时遇到的警告信息和异常错误的方法,包括建立SSL连接时未验证服务器身份的问题及未知字符集'utf8mb4'的异常。提供了配置建议和更改驱动版本的解决方案。

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Wed Jul 27 14:47:50 CST 2016 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.
Exception in thread "main" com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown character set: 'utf8mb4'
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.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:404)
	at com.mysql.jdbc.Util.getInstance(Util.java:387)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:942)
	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3966)
	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3902)
	at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2526)
	at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2673)
	at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2545)
	at com.mysql.jdbc.ConnectionImpl.configureClientCharacterSet(ConnectionImpl.java:1769)
	at com.mysql.jdbc.ConnectionImpl.initializePropsFromServer(ConnectionImpl.java:3357)
	at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2297)
	at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2083)
	at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:806)
	at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.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:404)
	at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:410)
	at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:328)
	at java.sql.DriverManager.getConnection(Unknown Source)
	at java.sql.DriverManager.getConnection(Unknown Source)
	at day01.ConnDemo.main(ConnDemo.java:31)

链接驱动数据库的驱动改成:mysql-connector-java-5.1.6-bin.jar即可。


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