Program: 78376
Project: 78376
Buggy source:
@Override public void actionPerformed(ActionEvent registrationAe){
  if (registrationAe.getActionCommand().equals("String_Node_Str")) {
    Password="String_Node_Str";
    confirmPassword="String_Node_Str";
    Password=readPassword(textPassword.getPassword());
    confirmPassword=readPassword(textConfirmPassword.getPassword());
    if (textName.getText().equals("String_Node_Str") || textSurname.getText().equals("String_Node_Str") || textCountry.getText().equals("String_Node_Str")|| textCity.getText().equals("String_Node_Str")|| textCap.getText().equals("String_Node_Str")|| textStreet.getText().equals("String_Node_Str")|| textStreetNumber.getText().equals("String_Node_Str")|| textPhoneNumber.getText().equals("String_Node_Str")|| Password == "String_Node_Str" || confirmPassword == "String_Node_Str" || textCreditCardOwnerName.getText().equals("String_Node_Str") || textCreditCardOwneSurname.getText().equals("String_Node_Str") || textCreditCardNumber.getText().equals("String_Node_Str") || textSecurityCode.getText().equals("String_Node_Str")) {
      JOptionPane.showMessageDialog(new JFrame(),"String_Node_Str","String_Node_Str",JOptionPane.ERROR_MESSAGE);
    }
 else     if (checkEmail(textEmail.getText())) {
      boolean inputPassword=changePasswordFields(Password,confirmPassword);
      boolean inputCap=checkCapNumber(textCap.getText());
      boolean inputAddressNumber=checkAddressNumber(textStreetNumber.getText());
      boolean inputPhoneNumber=checkPhoneNumber(textPhoneNumber.getText());
      if (inputPassword && inputCap && inputAddressNumber&& inputPhoneNumber) {
        boolean inputCrediCardNumber=checkCreditCardNumber(textCreditCardNumber.getText());
        Date inputDate=getNewExpirationDate();
        boolean inputCvv=checkCvvNumber(textSecurityCode.getText());
        if (inputCrediCardNumber && !(dateBeforeToday(inputDate)) && inputCvv) {
          boolean add=addCustomerValues();
          if (add) {
            JOptionPane.showMessageDialog(new JFrame(),"String_Node_Str","String_Node_Str",JOptionPane.INFORMATION_MESSAGE);
            GUICustomerLabel guiCustomerLabel=new GUICustomerLabel(textEmail.getText().toUpperCase(),guiSignUp);
            guiCustomerLabel.setVisible(true);
            dispose();
          }
        }
      }
    }
  }
  if (registrationAe.getActionCommand().equals("String_Node_Str")) {
    System.exit(0);
  }
}

Fixed version (ground truth):
@Override public void actionPerformed(ActionEvent registrationAe){
  if (registrationAe.getActionCommand().equals("String_Node_Str")) {
    Password="String_Node_Str";
    confirmPassword="String_Node_Str";
    Password=readPassword(textPassword.getPassword());
    confirmPassword=readPassword(textConfirmPassword.getPassword());
    if (textName.getText().equals("String_Node_Str") || textSurname.getText().equals("String_Node_Str") || textCountry.getText().equals("String_Node_Str")|| textCity.getText().equals("String_Node_Str")|| textCap.getText().equals("String_Node_Str")|| textStreet.getText().equals("String_Node_Str")|| textStreetNumber.getText().equals("String_Node_Str")|| textPhoneNumber.getText().equals("String_Node_Str")|| Password == "String_Node_Str" || confirmPassword == "String_Node_Str" || textCreditCardOwnerName.getText().equals("String_Node_Str") || textCreditCardOwneSurname.getText().equals("String_Node_Str") || textCreditCardNumber.getText().equals("String_Node_Str") || textSecurityCode.getText().equals("String_Node_Str")) {
      JOptionPane.showMessageDialog(new JFrame(),"String_Node_Str","String_Node_Str",JOptionPane.ERROR_MESSAGE);
    }
 else     if (checkEmail(textEmail.getText())) {
      boolean inputPassword=changePasswordFields(Password,confirmPassword);
      boolean inputCap=checkCapNumber(textCap.getText());
      boolean inputAddressNumber=checkAddressNumber(textStreetNumber.getText());
      boolean inputPhoneNumber=checkPhoneNumber(textPhoneNumber.getText());
      if (inputPassword && inputCap && inputAddressNumber&& inputPhoneNumber) {
        boolean inputCrediCardNumber=checkCreditCardNumber(textCreditCardNumber.getText());
        Date inputDate=getNewExpirationDate();
        boolean inputCvv=checkCvvNumber(textSecurityCode.getText());
        if (inputCrediCardNumber && !(dateBeforeToday(inputDate)) && inputCvv) {
          boolean add=addCustomerValues();
          if (add) {
            JOptionPane.showMessageDialog(new JFrame(),"String_Node_Str","String_Node_Str",JOptionPane.INFORMATION_MESSAGE);
            GUICustomerLabel guiCustomerLabel=new GUICustomerLabel(textEmail.getText().toUpperCase(),guiSignUp);
            guiCustomerLabel.setVisible(true);
            guiSignUp.setVisible(false);
          }
        }
      }
    }
  }
}