JDBC访问被拒绝错误

Question

I am trying to deploy my application to another server, and while the JDBC connection worked in my machine, I couldn't get it to work with this mysql server.

Some information about the mysql server:

    select user(); 
    +----------------+
    | user()         |
    +----------------+
    | root@localhost |
    +----------------+

    mysql> show variables where Variable_name="port";
    +---------------+-------+
    | Variable_name | Value |
    +---------------+-------+
    | port          | 3306  |
    +---------------+-------+

There is no password to login into the mysql with user localhost ( mysql -u root will be enough to login)

I used the following statement to connect to the database

    DriverManager.getConnection(
        "jdbc:mysql://localhost:3306/database_name", "root", ""));

But, It throws the following error

     java.sql.SQLException: Access denied for user 'root'@'localhost' (using password: NO)

Any suggestions? Thanks.

Answer 1

you need to in %MYSQL_INSTALL_PATH%/bin folder,using cmd and run:

mysqld -nt --skip-grant-tables
mysqladmin -u root flush-privileges password "NEW_PASSWORD"

and restart mysql service.

Answer 2

Try setting a password for root user. It is very bad and insecure to have root user without credentials. This link will help

Answer 3

Have you tried mysql -u root -p , with the password field not provided? I guess here's the problem "jdbc:mysql://localhost:3306/database_name", "root", "")); you used a "" as your password so I think you need to do this mysql -u root -p