Program: 78456
Project: 78456
Buggy source:
private void initComponents(){
  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(2,1));
  panelBottom.add(buttonLogin);
  panelBottom.add(buttonNewAccount);
  add(panelBottom,BorderLayout.SOUTH);
  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(proxy,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")) {
        GUISignUp guiSignUp=new GUISignUp();
        guiSignUp.setVisible(true);
        setVisible(false);
      }
    }
  }
;
  buttonLogin.addActionListener(al);
  buttonNewAccount.addActionListener(al);
}

Fixed version (ground truth):
private void initComponents(){
  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(2,1));
  panelBottom.add(buttonLogin);
  panelBottom.add(buttonNewAccount);
  add(panelBottom,BorderLayout.SOUTH);
  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")) {
        GUISignUp guiSignUp=new GUISignUp();
        guiSignUp.setVisible(true);
        setVisible(false);
      }
    }
  }
;
  buttonLogin.addActionListener(al);
  buttonNewAccount.addActionListener(al);
}