java - A problem connecting to a MySQL DB using JDBC -

here's how i'm trying connect:

try {    class.forname("com.mysql.jdbc.driver").newinstance();    } catch (exception e) {       throw new dbconnectionexception();    }    try {       connection = drivermanager.getconnection(url,username,password);    } catch (sqlexception e) {       e.printstacktrace();       throw new dbconnectionexception();    } 

i'm 100% sure url, username, password strings correct. i've connected using external tool (mysql query browser). error receive:

com.mysql.jdbc.communicationsexception: communications link failure due underlying exception:

** begin nested exception **

java.net.socketexception message: java.net.connectexception: connection refused

...

possibly url issue. if code pointing mysql localhost, try changing localhost 127.0.0.1 on url.

e.g.:

jdbc:mysql://localhost:3306/my_db 

to

jdbc:mysql://127.0.0.1:3306/my_db 

and see if works.