Program: 140144
Project: 140144
Buggy source:
@Override protected void addFieldsListeners(){
  lowerText.addModifyListener(new ModifyListener(){
    public void modifyText(    ModifyEvent e){
      String min=lowerText.getText();
      if (!CheckValueUtils.isNumberWithNegativeValue(min)) {
        updateStatus(IStatus.ERROR,MSG_ONLY_NUMBER);
      }
 else {
        updateStatus(IStatus.OK,MSG_OK);
      }
    }
  }
);
  higherText.addModifyListener(new ModifyListener(){
    public void modifyText(    ModifyEvent e){
      String max=higherText.getText();
      if (!CheckValueUtils.isNumberWithNegativeValue(max)) {
        updateStatus(IStatus.ERROR,MSG_ONLY_NUMBER);
      }
 else {
        updateStatus(IStatus.OK,MSG_OK);
      }
    }
  }
);
  if (canUsed) {
    pLowerText.addModifyListener(new ModifyListener(){
      public void modifyText(      ModifyEvent e){
        checkInput(pLowerText.getText());
      }
    }
);
    pHigherText.addModifyListener(new ModifyListener(){
      public void modifyText(      ModifyEvent e){
        checkInput(pHigherText.getText());
      }
    }
);
  }
}

Fixed version (ground truth):
@Override protected void addFieldsListeners(){
  lowerText.addModifyListener(new ModifyListener(){
    public void modifyText(    ModifyEvent e){
      String min=lowerText.getText();
      String max=higherText.getText();
      if (!CheckValueUtils.isEmpty(min)) {
        if (!CheckValueUtils.isNumberWithNegativeValue(min)) {
          updateStatus(IStatus.ERROR,MSG_ONLY_NUMBER);
        }
 else         if (!CheckValueUtils.isEmpty(max) && CheckValueUtils.isAoverB(min,max)) {
          updateStatus(IStatus.ERROR,UIMessages.MSG_LOWER_LESS_HIGHER);
        }
 else {
          updateStatus(IStatus.OK,MSG_OK);
        }
      }
 else {
        updateStatus(IStatus.OK,UIMessages.MSG_INDICATOR_WIZARD);
      }
    }
  }
);
  higherText.addModifyListener(new ModifyListener(){
    public void modifyText(    ModifyEvent e){
      String min=lowerText.getText();
      String max=higherText.getText();
      if (!CheckValueUtils.isEmpty(max)) {
        if (!CheckValueUtils.isNumberWithNegativeValue(max)) {
          updateStatus(IStatus.ERROR,MSG_ONLY_NUMBER);
        }
 else         if (!CheckValueUtils.isEmpty(min) && CheckValueUtils.isAoverB(min,max)) {
          updateStatus(IStatus.ERROR,UIMessages.MSG_LOWER_LESS_HIGHER);
        }
 else {
          updateStatus(IStatus.OK,MSG_OK);
        }
      }
 else {
        updateStatus(IStatus.OK,UIMessages.MSG_INDICATOR_WIZARD);
      }
    }
  }
);
  if (canUsed) {
    pLowerText.addModifyListener(new ModifyListener(){
      public void modifyText(      ModifyEvent e){
        String pmin=pLowerText.getText();
        String pmax=pHigherText.getText();
        if (!CheckValueUtils.isEmpty(pmin)) {
          if (!CheckValueUtils.isRealNumberValue(pmin)) {
            updateStatus(IStatus.ERROR,MSG_ONLY_REAL_NUMBER);
          }
 else           if (CheckValueUtils.isOutRange(MIN,MAX,pmin)) {
            updateStatus(IStatus.ERROR,UIMessages.MSG_INDICATOR_VALUE_OUT_OF_RANGE);
          }
 else           if (!CheckValueUtils.isEmpty(pmax) && CheckValueUtils.isAoverB(pmin,pmax)) {
            updateStatus(IStatus.ERROR,UIMessages.MSG_LOWER_LESS_HIGHER);
          }
 else {
            updateStatus(IStatus.OK,MSG_OK);
          }
        }
 else {
          updateStatus(IStatus.OK,UIMessages.MSG_INDICATOR_WIZARD);
        }
      }
    }
);
    pHigherText.addModifyListener(new ModifyListener(){
      public void modifyText(      ModifyEvent e){
        String pmin=pLowerText.getText();
        String pmax=pHigherText.getText();
        if (!CheckValueUtils.isEmpty(pmax)) {
          if (!CheckValueUtils.isRealNumberValue(pmax)) {
            updateStatus(IStatus.ERROR,MSG_ONLY_REAL_NUMBER);
          }
 else           if (CheckValueUtils.isOutRange(MIN,MAX,pmax)) {
            updateStatus(IStatus.ERROR,UIMessages.MSG_INDICATOR_VALUE_OUT_OF_RANGE);
          }
 else           if (!CheckValueUtils.isEmpty(pmin) && CheckValueUtils.isAoverB(pmin,pmax)) {
            updateStatus(IStatus.ERROR,UIMessages.MSG_LOWER_LESS_HIGHER);
          }
 else {
            updateStatus(IStatus.OK,MSG_OK);
          }
        }
 else {
          updateStatus(IStatus.OK,UIMessages.MSG_INDICATOR_WIZARD);
        }
      }
    }
);
  }
}