java.sql.SQLException（使用密码：NO）

Question

I'm attempting to connect to my server's MySQL, yet I keep running into the same issue and cannot find a similar problem. My code snippet is below:

public class MySqlDatabaseHandler {
    Connection con = null;
    Statement st = null;
    ResultSet rs = null;

    public MySqlDatabaseHandler(String url, String user, String password){
        /*String url = "jdbc:mysql://192.168.1.80:3306/testdb";
        String user = "root";
        String password = "rootpass";*/
        try {
            Class.forName("com.mysql.jdbc.Driver");
            con = DriverManager.getConnection(url, user, password);
            st = con.createStatement();
        }
        catch (Exception e){
            e.printStackTrace();
        }  
    }
}

And the results I receive:

java.sql.SQLException: Access denied for user 'root'@'192.168.1.3' (using password: NO)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1074)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4120)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4052)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:925)
at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1704)
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1250)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2465)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2498)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2283)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:822)
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:411)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:404)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:317)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at handleServer.includes.classes.Server.MySqlDatabaseHandler.<init>(MySqlDatabaseHandler.java:24)

By the look of things, I believe the password is never being sent to the server because of the "(using password: NO)".

I have even attempted to change the url to "jdbc:mysql://192.168.1.80:3306/testdb?user=root&password=rootpass" and find myself with the same results.

MySql allows remote connection to the testing client(192.168.1.3) and has been tested with telnet, but runs into this issue with JDBC. Does anyone see what I am doing wrong?

Answer 1

It seems something is wrong with MySQL privilege setting.You can try this,open MySQL command line prompt,run the following script:

grant all privileges on *.* to 'root'@'localhost' identified by 'password' with grant option;
flush privileges;

Answer 2

I think this is a purposeful limitation to prevent root access on a network. Try taking a look at this Q&A for the workaround. It's basically the same as @pigletfly's solution but with a domain name.