Cant connect to mysql

i can connect to mysql in runtime window
i can create connection to my database
i can execute SQL command and the results are displayed
but in my program i can't connect to mysql!!!
             Class.forName("com.mysql.jdbc.Driver");
         jdbcConnection = DriverManager.getConnection("jdbc:mysql://localhost/grade" ,"root","");it got error
     Exception in thread "main" java.lang.ClassNotFoundException: com.mysql.jdbc.Driverso, i changed the driver name to "org.gjt.mm.mysql.Driver", it still got the same error
What should i do?
(i can connect to Access with the same code already)
:'(

The classpath for the IDE and your application is in most cases different. And being able to use a resource from the IDE does not guarantee such an ability at runtime.
In order for your application to be able to connect to MySQL, make sure that the corresponding MySQL driver exists in your app's classpath. Expand the Libraries node under your project node and check whether the MySQL driver jat file is present there. If it's not - add it.
The latest JDBC driver for MySQL can be obtained at http://dev.mysql.com/downloads/

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