Java EE (Java Enterprise Edition) General Discussion

I am using Java Studio creator and i try to connection mysql. I can't import into Java Studio Creator.
i give correct JDBC driver class and also set up JConnector.
It show error message with local host not found and connection refuse.

What kind of URL i should use: i use "jdbc:mysql://localhost/databasename"
It isnot only from Java studio creator. It also happening in netbean.
i don't know how to connect java with MYSQL from Linux.

Please give me procedure to set up. MySQL is running. MySQL CCC can show all databases.
i just can't put into IDE and also use from java.

thanks