是什么原因导致添加到表时出现Null异常？

Question

我正在尝试将所有数据库内容显示给Jtable，但是它一直给我提供null异常      当我尝试仅将结果打印到控制台时，它可以完美运行并向我显示记录     我也试图只获取一条记录并将其显示在表中，但它确实起作用了，我真的不知道出了什么问题！*

private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        int index=0;       
        try {

                     DataBase.connect();
                     PreparedStatement statement = DataBase.c.prepareStatement("select * from patient");    
                     ss = statement.executeQuery();
                  while(ss.next())
                  {         
                          p.add(new Paitent());
                          fillObject(ss,p.get(p.size()-1));
                          filltable(p.get(p.size()-1));
                          index++;
                          System.out.println("index = "+index);
                  }
                } catch (SQLException ex) {
                    Logger.getLogger(PateintFrame.class.getName()).log(Level.SEVERE, null, ex);
                }

    }                   


     public void fillObject(ResultSet s1,Paitent p) throws SQLException
        {
                    p.setName(s1.getString("name"));
                    p.setId(s1.getInt("id"));
                    p.setGender(s1.getString("gender"));
                    p.setNumber_of_sessions(s1.getInt("numberofsessions"));
                    p.setComments(s1.getString("comments"));
                    p.setEntry_date((Date) s1.getObject("Date"));
                    p.setTherapist_name(s1.getString("therapist_name"));
                    p.setTherapist_id(s1.getInt("therapist_id"));


        }
     public void filltable(Paitent p)
        {
             model2.addRow(new Object[]{       p.getName(),p.getGender(),p.getNumber_of_sessions(),20,p.getComments(),p.getTherapist_name(),p.getEntry_date(),p.getTherapist_id()
                              }   );

            System.out.println("this is from filltable function patient's name is : "+p.getName());
        }