Program: 36008
Project: 36008
Buggy source:
/** 
 * Initializes the controller class.
 */
@Override public void initialize(URL url,ResourceBundle rb){
  keyColumn.setCellValueFactory(new PropertyValueFactory<>("String_Node_Str"));
  keyColumn.setCellFactory(p -> new TableCell<HeapStatsConfig,String>(){
    @Override protected void updateItem(    String item,    boolean empty){
      if (!empty) {
        HeapStatsConfig config=configTable.getItems().get(getIndex());
        styleProperty().bind(Bindings.createStringBinding(() -> config.changedProperty().get() ? "String_Node_Str" : "String_Node_Str",config.changedProperty()));
        setText(item);
      }
    }
  }
);
  valueColumn.setCellValueFactory(new PropertyValueFactory<>("String_Node_Str"));
  valueColumn.setCellFactory(p -> new TableCell<HeapStatsConfig,Object>(){
    @Override protected void updateItem(    Object item,    boolean empty){
      super.updateItem(item,empty);
      if (empty) {
        return;
      }
      Property valProp=(Property)getTableColumn().getCellObservableValue(getIndex());
      Node node;
      if (item == null) {
        node=new TextField();
        ((TextField)node).textProperty().bindBidirectional(valProp);
      }
 else       if (item instanceof Boolean) {
        node=new CheckBox();
        ((CheckBox)node).selectedProperty().bindBidirectional(valProp);
      }
 else       if (item instanceof HeapStatsMBean.LogLevel) {
        node=new ChoiceBox(FXCollections.observableArrayList(HeapStatsMBean.LogLevel.values()));
        ((ChoiceBox<HeapStatsMBean.LogLevel>)node).valueProperty().bindBidirectional(valProp);
      }
 else       if (item instanceof HeapStatsMBean.RankOrder) {
        node=new ChoiceBox(FXCollections.observableArrayList(HeapStatsMBean.RankOrder.values()));
        ((ChoiceBox<HeapStatsMBean.RankOrder>)node).valueProperty().bindBidirectional(valProp);
      }
 else       if (item instanceof Long) {
        node=new TextField();
        ((TextField)node).textProperty().bindBidirectional((Property<Long>)valProp,new LongStringConverter());
      }
 else {
        node=new TextField();
        ((TextField)node).textProperty().bindBidirectional(valProp);
      }
      setGraphic(node);
    }
  }
);
}

Fixed version (ground truth):
/** 
 * Initializes the controller class.
 */
@Override public void initialize(URL url,ResourceBundle rb){
  keyColumn.setCellValueFactory(new PropertyValueFactory<>("String_Node_Str"));
  keyColumn.setCellFactory(p -> new TableCell<HeapStatsConfig,String>(){
    @Override protected void updateItem(    String item,    boolean empty){
      if (!empty) {
        HeapStatsConfig config=configTable.getItems().get(getIndex());
        styleProperty().bind(Bindings.createStringBinding(() -> config.changedProperty().get() ? "String_Node_Str" : "String_Node_Str",config.changedProperty()));
        setText(item);
      }
    }
  }
);
  valueColumn.setCellValueFactory(new PropertyValueFactory<>("String_Node_Str"));
  valueColumn.setCellFactory(p -> new TableCell<HeapStatsConfig,Object>(){
    @Override protected void updateItem(    Object item,    boolean empty){
      super.updateItem(item,empty);
      if (empty) {
        return;
      }
      Property valProp=(Property)getTableColumn().getCellObservableValue(getIndex());
      Node node;
      if (item == null) {
        node=new TextField();
        ((TextField)node).textProperty().bindBidirectional(valProp);
      }
 else       if (item instanceof Boolean) {
        node=new CheckBox();
        ((CheckBox)node).selectedProperty().bindBidirectional(valProp);
      }
 else       if (item instanceof HeapStatsMBean.LogLevel) {
        node=new ChoiceBox(FXCollections.observableArrayList(HeapStatsMBean.LogLevel.values()));
        ((ChoiceBox<HeapStatsMBean.LogLevel>)node).valueProperty().bindBidirectional(valProp);
      }
 else       if (item instanceof HeapStatsMBean.RankOrder) {
        node=new ChoiceBox(FXCollections.observableArrayList(HeapStatsMBean.RankOrder.values()));
        ((ChoiceBox<HeapStatsMBean.RankOrder>)node).valueProperty().bindBidirectional(valProp);
      }
 else       if (item instanceof Integer) {
        node=new TextField();
        ((TextField)node).textProperty().bindBidirectional((Property<Integer>)valProp,new IntegerStringConverter());
      }
 else       if (item instanceof Long) {
        node=new TextField();
        ((TextField)node).textProperty().bindBidirectional((Property<Long>)valProp,new LongStringConverter());
      }
 else {
        node=new TextField();
        ((TextField)node).textProperty().bindBidirectional(valProp);
      }
      setGraphic(node);
    }
  }
);
}