com.mysql.jdbc.exceptions.jdbc4.MysqlSyntaxErrorException:Access denied for user "@'local host' to database 'mysql'

Question

com.mysql.jdbc.exceptions.jdbc4.MysqlSyntaxErrorException:Access denied for user "@'local host' to database 'mysql'

This is my problem. I get this error every time I try to do the execution.

I have already tried this:

GRANT ALL PRIVILEGES 
ON GUEST_BOOK.* TO 'root'@'%' 
IDENTIFIED BY 'D7n()st1234' WITH GRANT OPTION;

Answer 1

您以“”用户身份连接（如零长度字符串），需要正确指定用户名

Answer 2

connection = DriverManager.getConnection(URL,USERNAME,PASSWORD); make sure the "USERNAME" and the "PASSWORD" is not forgetton