Program: 88663
Project: 88663
Buggy source:
@SuppressWarnings("String_Node_Str") private static void addValues(Element e,JSONArray value,JSONObject elementInfo,ValueSpecification vs){
  if (vs instanceof LiteralBoolean) {
    elementInfo.put("String_Node_Str",PropertyValueType.LiteralBoolean.toString());
    value.add(((LiteralBoolean)vs).isValue());
  }
 else   if (vs instanceof LiteralString) {
    elementInfo.put("String_Node_Str",PropertyValueType.LiteralString.toString());
    value.add(((LiteralString)vs).getValue());
  }
 else   if (vs instanceof LiteralInteger || vs instanceof LiteralUnlimitedNatural) {
    elementInfo.put("String_Node_Str",PropertyValueType.LiteralInteger.toString());
    if (vs instanceof LiteralInteger) {
      value.add(((LiteralInteger)vs).getValue());
    }
 else     value.add(((LiteralUnlimitedNatural)vs).getValue());
  }
 else   if (vs instanceof LiteralReal) {
    elementInfo.put("String_Node_Str",PropertyValueType.LiteralReal.toString());
    value.add(((LiteralReal)vs).getValue());
  }
 else   if (vs instanceof Expression) {
    elementInfo.put("String_Node_Str",PropertyValueType.Expression.toString());
    value.add(RepresentationTextCreator.getRepresentedText(vs));
  }
 else   if (vs instanceof ElementValue) {
    elementInfo.put("String_Node_Str",PropertyValueType.ElementValue.toString());
    Element ev=((ElementValue)vs).getElement();
    if (ev != null) {
      value.add(ev.getID());
    }
  }
  elementInfo.put("String_Node_Str",value);
}

Fixed version (ground truth):
@SuppressWarnings("String_Node_Str") public static void addValues(Element e,JSONArray value,JSONObject elementInfo,ValueSpecification vs){
  if (vs instanceof LiteralBoolean) {
    elementInfo.put("String_Node_Str",PropertyValueType.LiteralBoolean.toString());
    value.add(((LiteralBoolean)vs).isValue());
  }
 else   if (vs instanceof LiteralString) {
    elementInfo.put("String_Node_Str",PropertyValueType.LiteralString.toString());
    value.add(((LiteralString)vs).getValue());
  }
 else   if (vs instanceof LiteralInteger || vs instanceof LiteralUnlimitedNatural) {
    elementInfo.put("String_Node_Str",PropertyValueType.LiteralInteger.toString());
    if (vs instanceof LiteralInteger) {
      value.add(((LiteralInteger)vs).getValue());
    }
 else     value.add(((LiteralUnlimitedNatural)vs).getValue());
  }
 else   if (vs instanceof LiteralReal) {
    elementInfo.put("String_Node_Str",PropertyValueType.LiteralReal.toString());
    value.add(((LiteralReal)vs).getValue());
  }
 else   if (vs instanceof Expression) {
    elementInfo.put("String_Node_Str",PropertyValueType.Expression.toString());
    value.add(RepresentationTextCreator.getRepresentedText(vs));
  }
 else   if (vs instanceof ElementValue) {
    elementInfo.put("String_Node_Str",PropertyValueType.ElementValue.toString());
    Element ev=((ElementValue)vs).getElement();
    if (ev != null) {
      value.add(ev.getID());
    }
  }
 else   if (vs instanceof InstanceValue) {
    elementInfo.put("String_Node_Str",PropertyValueType.ElementValue.toString());
    Element ev=((InstanceValue)vs).getInstance();
    if (ev != null) {
      value.add(ExportUtility.getElementID(ev));
    }
  }
  elementInfo.put("String_Node_Str",value);
}