ResultSet e NullPointerException

public void getRow(String fonte){
        try {
            getConnection();
            rs=stm.executeQuery("select * from rubrica_receita where rr_fonte='"+fonte+"'");
            while(rs.next()){
            rr.setRr_num(rs.getString("rr_num")); // linha 41
            rr.setRr_tipo(rs.getString("rr_tipo"));
            rr.setRr_nome(rs.getString("rr_nome"));
            rr.setRr_fonte(rs.getString("rr_fonte"));
            rr_list.add(rr);
          }
        }catch (SQLException ex) {
             Logger.getLogger(Fontes.class.getName()).log(Level.SEVERE, null, ex);       
        }finally{
            endOfConnection();
        }
        
    
    }

private void getConnection(){
            try {
                conn = (Connection) DriverManager.getConnection(DATABASE_URL, USERNAME, PASSWORD);
                stm = (Statement) conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY);
                System.out.println("Conectado");
         }catch(SQLException ex){
                Logger.getLogger(Fontes.class.getName()).log(Level.SEVERE, null, ex);
         }
    }

private void endOfConnection() {
         try {
            rs.close();
            stm.close();
            conn.close();
            
            
        } catch (SQLException ex) {
            Logger.getLogger(Fontes.class.getName()).log(Level.SEVERE, null, ex);
        }finally{
             System.out.println("Desconectado");
         }
        
    }