Locall MySQL DB login Error : Access denied for user 'root'#'localhost' (using password: YES) - mysql

Question

I have the weirdest MySQL login problem ever!
The DBMS is installed on my desktop and I'm accessing it locally, not through a network or internet.
When I try to connect to it via cmd:
mysql -u root -proot;
it connects perfectly..
but, when I try to connect through a Java program in NetBeans:
Connection con = null;
String url ="jdbc:mysql://localhost:3306/testdb";
String user ="root";
String password ="root";
try
{
con = DriverManager.getConnection(url,user,password);
}
Catch(Exception e)
{
System.out.println(e.toString() );
}
it throws an exception !!
java.sql.SQLException: Access denied for user 'root'#'localhost' (using password: YES)
I have the mysql-connector-java-5.1.24-bin.jar library added to NetBeans..
It was working before, not sure why it is not working now!!
Also, when I connect to MySQL like this:
mysql -u root -p;
then I enter the password, it gives this error:
ERROR 1045 (28000): Access denied for user 'root'#'localhost' (using password: YES)
??

Answer 1

Connection con = null;
String dbase = "database";
String dbuser = "root";
String dbpass = "";
try{
String ConnString;
Class.forName("com.mysql.jdbc.Driver").newInstance();
ConnString = "jdbc:mysql://localhost:3306/"+dbase+"?user="+dbuser+"&password="+dbpass;
con = DriverManager.getConnection(ConnString);
//System.out.println("Connection to database successful!");
}catch(Exception e){
e.printStackTrace();
}
Try this?

Answer 2

so stupid ~~~
I found the problem ...
Here's why this is happening and how I solved it:
Reason of problem: I changed the password for root from blank to 'root'
Then, I couldn't connect to MySQL from Java ..
it turns out I have to update the privileges of the database after changing the password.
So I did that by:
GRANT ALL PRIVILEGES ON [database_name].* to '[user]'#'[hostname]' identified by '[password]'
and now it works 100%