java–错误：客户端不支持服务器请求的身份验证协议;考虑升级MySQL客户端

执行JDBC程序时,连接到数据库时出现以下错误：

Exception in thread "main"
com.mysql.jdbc.exceptions.MySQLNonTransientConnectionException: Client does
not support authentication protocol requested by server; consider upgrading
MySQL client
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:921)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2985)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:885)
at com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:3421)
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1247)
at com.mysql.jdbc.Connection.createNewIO(Connection.java:2775)
at com.mysql.jdbc.Connection.(Connection.java:1555)
at
com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:285)
at java.sql.DriverManager.getConnection(DriverManager.java:664)
at java.sql.DriverManager.getConnection(DriverManager.java:270)
at main.java.MyFirstJdbcProgram.readDataBase(MyFirstJdbcProgram.java:23)
at main.java.Main.main(Main.java:6)


当我研究这个时,我知道下面的错误是因为我需要向用户授予权限,所以请按照

> mysql -u root -p
>然后输入密码
>然后我跑了

GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' IDENTIFIED BY 'mypassword';


而且我也用过

UPDATE user SET authentication_string=password('mypassword') WHERE user='root';


但我收到了以下错误

ERROR 1064 (42000): You have an error in your SQL syntax; check the

manual that corresponds to your MySQL server version for the right

syntax to use near ‘IDENTIFIED BY ‘mypassword” at line 1

解决方法:

出现此错误的原因是您使用的是MySQL Connector / J 5.1.45或更早版本. MySQL 8引入了一种新的身份验证机制(caching_sha2_password),在这些版本的驱动程序中不受支持.

您需要升级到MySQL Connector / J 5.1.46或更高版本.在编写本文时,最新版本的MySQL Connector / J驱动程序是8.0.15.您可以从https://dev.mysql.com/downloads/connector/j/下载它或在Maven / Gradle等中指定正确的版本.