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，连接数据库时出现以下错误：

While executing a JDBC program, I get the following error while connecting to database:

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.<init>(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，我知道下面的内容错误是因为我需要向用户授予权限，所以按照

When I researched this, I got to know that the below error is because I need to grant the privileges to the user, so follow

1. mysql -u root -p


2. 然后输入密码



3. 然后我跑

1. mysql -u root -p
2. then entered the password

3. then I ran

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

我还使用了

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

但我收到以下错误

错误1064（42000）：您的SQL语法有错误;检查与你的MySQL服务器版本相对应的
手册，以便在第1行'IDENTIFIED BY'mypassword''附近使用正确的
语法

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