abreal on "wordpress on tomcat server and database connection error"

Hi,
I installed wordpress with tomcat server using quercus.jar and MySQL connecter jar after running the wp-admin/setup-config.php?step=0 I got this error msg

Error establishing a database connection

I am sure about the username and database name and I used localhost as host name
and MySQL database is running successively on the server.
any idea why I keep getting this error msg

thanks,