Program: 78373
Project: 78373
Buggy source:
private void initComponents(){
  cont1.setLayout(new GridLayout(2,1,10,0));
  textUser.setText("String_Node_Str");
  textPwd.setText("String_Node_Str");
  panelLoginData.setLayout(new GridLayout(2,2));
  panelLoginData.add(labelUser);
  panelLoginData.add(textUser);
  panelLoginData.add(labelPwd);
  panelLoginData.add(textPwd);
  add(panelLoginData,BorderLayout.CENTER);
  panelBottom.setLayout(new GridLayout(3,1));
  panelBottom.add(buttonLogin);
  panelBottom.add(buttonLoginSitter);
  panelBottom.add(buttonNewAccount);
  add(panelBottom,BorderLayout.SOUTH);
  cont1.add(panelLoginData);
  cont1.add(panelBottom);
  panelLoginData.setBackground(new Color(176,144,97));
  panelBottom.setBackground(new Color(176,144,97));
  textPwd.setBackground(new Color(241,230,218));
  textUser.setBackground(new Color(241,230,218));
  Toolkit kit=Toolkit.getDefaultToolkit();
  Dimension screenSize=kit.getScreenSize();
  int screenHeight=screenSize.height;
  int screenWidth=screenSize.width;
  setSize(screenWidth / 2,screenHeight / 2);
  setLocation(screenWidth / 4,screenHeight / 4);
  Image img=getToolkit().getImage("String_Node_Str");
  setIconImage(img);
  ImagePanel panel=new ImagePanel();
  panel.setBackground(SystemColor.window);
  Container contentPane=getContentPane();
  contentPane.add(panel);
  panel.setLayout(layout);
  cont1.setPreferredSize(new Dimension(525,145));
  cont1.setMinimumSize(new Dimension(525,145));
  panel.add(cont1);
  cont1.setOpaque(false);
  ActionListener al=new ActionListener(){
    @Override public void actionPerformed(    ActionEvent ae){
      if (ae.getActionCommand().equals("String_Node_Str") && !(textUser.equals("String_Node_Str")) && !(textPwd.equals("String_Node_Str"))) {
        if (proxy.customerAccessDataVerifier(textUser.getText(),new String(textPwd.getPassword()))) {
          GUICustomer guiCustomer=null;
          try {
            guiCustomer=new GUICustomer(textUser.getText());
          }
 catch (          ParseException e) {
            System.out.println("String_Node_Str");
          }
          guiCustomer.setVisible(true);
          setVisible(false);
        }
 else {
          JOptionPane.showMessageDialog(new JFrame(),"String_Node_Str","String_Node_Str",JOptionPane.ERROR_MESSAGE);
          textUser.setText("String_Node_Str");
          textPwd.setText("String_Node_Str");
        }
      }
      if (ae.getActionCommand().equals("String_Node_Str") && !(textUser.equals("String_Node_Str")) && !(textPwd.equals("String_Node_Str"))) {
        if (dogSitterProxy.dogSitterAccessDataVerifier(textUser.getText(),new String(textPwd.getPassword()))) {
          GUIDogSitter guiDogSitter=null;
          try {
            guiDogSitter=new GUIDogSitter(textUser.getText());
          }
 catch (          ParseException e) {
            System.out.println("String_Node_Str");
          }
          guiDogSitter.setVisible(true);
          setVisible(false);
        }
 else {
          JOptionPane.showMessageDialog(new JFrame(),"String_Node_Str","String_Node_Str",JOptionPane.ERROR_MESSAGE);
          textUser.setText("String_Node_Str");
          textPwd.setText("String_Node_Str");
        }
      }
      if (ae.getActionCommand().equals("String_Node_Str")) {
        GUISignUp guiSignUp=new GUISignUp();
        guiSignUp.setVisible(true);
        setVisible(false);
      }
    }
  }
;
  buttonLogin.addActionListener(al);
  buttonNewAccount.addActionListener(al);
  buttonLoginSitter.addActionListener(al);
}

Fixed version (ground truth):
private void initComponents(){
  cont1.setLayout(new GridLayout(2,1,10,0));
  textUser.setText("String_Node_Str");
  textPwd.setText("String_Node_Str");
  panelLoginData.setLayout(new GridLayout(2,2));
  panelLoginData.add(labelUser);
  panelLoginData.add(textUser);
  panelLoginData.add(labelPwd);
  panelLoginData.add(textPwd);
  add(panelLoginData,BorderLayout.CENTER);
  panelBottom.setLayout(new GridLayout(3,1));
  panelBottom.add(buttonLogin);
  panelBottom.add(buttonLoginSitter);
  panelBottom.add(buttonNewAccount);
  add(panelBottom,BorderLayout.SOUTH);
  cont1.add(panelLoginData);
  cont1.add(panelBottom);
  panelLoginData.setBackground(new Color(176,144,97));
  panelBottom.setBackground(new Color(176,144,97));
  textPwd.setBackground(new Color(241,230,218));
  textUser.setBackground(new Color(241,230,218));
  Toolkit kit=Toolkit.getDefaultToolkit();
  Dimension screenSize=kit.getScreenSize();
  int screenHeight=screenSize.height;
  int screenWidth=screenSize.width;
  setSize(screenWidth / 2,screenHeight / 2);
  setLocation(screenWidth / 4,screenHeight / 4);
  Image img=getToolkit().getImage("String_Node_Str");
  setIconImage(img);
  ImagePanel panel=new ImagePanel();
  panel.setBackground(SystemColor.window);
  Container contentPane=getContentPane();
  contentPane.add(panel);
  panel.setLayout(layout);
  cont1.setPreferredSize(new Dimension(525,145));
  cont1.setMinimumSize(new Dimension(525,145));
  panel.add(cont1);
  cont1.setOpaque(false);
  ActionListener al=new ActionListener(){
    @Override public void actionPerformed(    ActionEvent ae){
      if (ae.getActionCommand().equals("String_Node_Str") && !(textUser.equals("String_Node_Str")) && !(textPwd.equals("String_Node_Str"))) {
        if (proxy.customerAccessDataVerifier(textUser.getText(),new String(textPwd.getPassword()))) {
          GUICustomer guiCustomer=null;
          try {
            guiCustomer=new GUICustomer(textUser.getText());
          }
 catch (          ParseException e) {
            System.out.println("String_Node_Str");
          }
          guiCustomer.setVisible(true);
          setVisible(false);
        }
 else {
          JOptionPane.showMessageDialog(new JFrame(),"String_Node_Str","String_Node_Str",JOptionPane.ERROR_MESSAGE);
          textUser.setText("String_Node_Str");
          textPwd.setText("String_Node_Str");
        }
      }
      if (ae.getActionCommand().equals("String_Node_Str") && !(textUser.equals("String_Node_Str")) && !(textPwd.equals("String_Node_Str"))) {
        if (dogSitterProxy.dogSitterAccessDataVerifier(textUser.getText(),new String(textPwd.getPassword()))) {
          GUIDogSitter guiDogSitter=null;
          try {
            guiDogSitter=new GUIDogSitter(textUser.getText());
          }
 catch (          ParseException e) {
            System.out.println("String_Node_Str");
          }
          guiDogSitter.setVisible(true);
          setVisible(false);
        }
 else {
          JOptionPane.showMessageDialog(new JFrame(),"String_Node_Str","String_Node_Str",JOptionPane.ERROR_MESSAGE);
          textUser.setText("String_Node_Str");
          textPwd.setText("String_Node_Str");
        }
      }
      if (ae.getActionCommand().equals("String_Node_Str")) {
        GUISignUp guiSignUp=new GUISignUp(guiLogin);
        guiSignUp.setVisible(true);
      }
    }
  }
;
  buttonLogin.addActionListener(al);
  buttonNewAccount.addActionListener(al);
  buttonLoginSitter.addActionListener(al);
}