Null pointer exception without any reason

Question

Can anybody tell me why the following portin of code is throwing null pointer exception
Connection con=null;
          ResultSet rs;
          Statement stmt=null;
try{
                    //----------------- Driver -------------------
                    Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
                    //----------------- URL WITHOUT DSN ----------------------------               
                    String conString = "jdbc:odbc:DRIVER={MicroSoft Access Driver (*.mdb)};" +
                   "DBQ=./data/RMS.mdb";
                    con = DriverManager.getConnection(conString,"","");
                    stmt = con.createStatement();
                                String sql="SELECT * FROM Employee";
                       stmt.executeQuery(sql);
                       rs.next();
catch(ClassNotFoundException cnfe){     System.out.println("Driver Not Found !!!");                    }
               catch(SQLException sqle){
                    System.out.println("DSN Not Found !!!");                    }

Answer 1

Thanks a lot brother, how could I do such mistake!!
One more thing, can you tell me how to delete the trace of PK auto-number from MsAccess DB.I mean, if I delete all the data from the table and insert again, yet it does not start from Pk id- 1, auto-number starts from after the previously deleted data.How can I make it start from -" 1 " , if there is no data in the table.
THANKS in advance.
Edited by: Tanvir007 on Oct 26, 2008 12:29 PM