No suitable driver found for jdbc:mysql://localhost:3306/ with netbeans 7.0.1, glassfish 3.1
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I have a class named "Sta". Everytime I try to connect to the mysql Database I run into the exception: **2012/07/23 03:34:50SQLException: No suitable driver found for mysql:jdbc://127.0.0.1:3306/sta?user=root..**
This exception  like said occurs at: **this.db_con=DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/sta?user=root");**

What I've done so far is:
Put the mysql driver jar into the library (via the project properties), 
put the driver jar manually into WEB-INF/lib (creaded the lib), and also put it into
the library directory of the tomcat. All with the same result 
(I'm using: mysql-connector-java-5.1.20-bin.jar )

The project itself compiles and deploys normally except for the above exception.
Furthermore if I use the same connectionstring for a "normal" java - RMI application
it works fine and without any hitches. 


    public class Sta_client extends HttpServlet 
    {
        private Connection db_con=null;
        
        public Sta_client() throws ServletException
        {
            super();
            
            if (this.db_con==null)
            {
                try
                {
                    Class.forName("com.mysql.jdbc.Driver");
                } 
                catch(java.lang.ClassNotFoundException e) 
                {
                    System.err.print("ClassNotFoundException: ");
                    System.err.println(e.getMessage());
                }
    
                try 
                {
                    this.db_con=DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/sta?user=root");
                } 
                catch(SQLException ex) 
                {
                    DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
                    Date date = new Date();
                    System.err.println(dateFormat.format(date)+"SQLException: " + ex.getMessage());
                }
            }
        }