problem in database connection java desktop app

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Java

MySQL

In this code i tried to connect my java program to MySQL database that stored on xtreemhost website but i cant.please help me to solve this

         Connection con = null;
  String url = "jdbc:mysql://sql108.xtreemhost.com/";

  String db = " xth_10161434_pos";
  String driver = "com.mysql.jdbc.Driver";
  String user = "xth_10161434";
  String pass = "*****";
  
   
    try{
         
  Class.forName(driver);
  con =(Connection) DriverManager.getConnection(url+db, user, pass);
   Statement st = (Statement) con.createStatement();
   

  ResultSet rs=st.executeQuery("SELECT * FROM xth_10161434_pos.product LIMIT 0 TO 30;");
          
while(rs.next())
  {
System.out.println(rs.getString(2));
  }
    }
    catch(Exception e)
    {
    System.out.println(e);
  
    }

Showing an Exception:
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.