Problem obtaining row number in a TableView

Question

I have a TableView configured by means of a MapValueFactory as it is shown in the code below:
private void configureColumns() {
    getColumns().clear();
    List<String> nonAnonymousVariablesNames = getNonAnonymousVariablesNames();
    if(nonAnonymousVariablesNames != null && !nonAnonymousVariablesNames.isEmpty()) {
        for(String nonAnonymousVarName : nonAnonymousVariablesNames) {
            TableColumn<Map<String, Term>, Term> dataColumn = new TableColumn<>(nonAnonymousVarName);
            dataColumn.setCellValueFactory(new MapValueFactory(nonAnonymousVarName));
            dataColumn.setMinWidth(130);
            Callback<TableColumn<Map<String, Term>, Term>, TableCell<Map<String, Term>, Term>>
                cellFactoryForMap = new Callback<TableColumn<Map<String, Term>, Term>, TableCell<Map<String, Term>, Term>>() {
                    @Override
                    public TableCell call(TableColumn p) {
                        TextFieldTableCell tableCell = new TextFieldTableCell();
                        TableRow row = tableCell.getTableRow();
                        final int index = row.getIndex();
                        StringConverter sc = new StringConverter() {
                            @Override
                            public String toString(Object t) {
                                //return something based on the current row and the object t
                            @Override
                            public Object fromString(String string) {
                                return null;
                        tableCell.setConverter(sc);
                        return tableCell;
            dataColumn.setCellFactory(cellFactoryForMap);
            getColumns().add(dataColumn);
I am trying to get the row number before printing the content of a cell. However, the call to row.getIndex(); triggers the following exception:
SEVERE: javafx.scene.control.Control impl_processCSS The -fx-skin property has not been defined in CSS for TableRow[id=null, styleClass=cell indexed-cell table-row-cell]
SEVERE: javafx.scene.control.Control loadSkinClass Failed to load skin 'StringProperty [bean: TableRow[id=null, styleClass=cell indexed-cell table-row-cell], name: skinClassName, value: com.sun.javafx.scene.control.skin.TableRowSkin]' for control TableRow[id=null, styleClass=cell indexed-cell table-row-cell]
java.lang.NullPointerException
    at org.jpc.commons.prologbrowser.model.QueryResultModel$1.call(QueryResultModel.java:74)
    at org.jpc.commons.prologbrowser.model.QueryResultModel$1.call(QueryResultModel.java:1)
    at com.sun.javafx.scene.control.skin.TableRowSkin.recreateCells(TableRowSkin.java:224)
    at com.sun.javafx.scene.control.skin.TableRowSkin.<init>(TableRowSkin.java:87)
    at sun.reflect.GeneratedConstructorAccessor6.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
    at javafx.scene.control.Control.loadSkinClass(Control.java:1044)
    at javafx.scene.control.Control.access$500(Control.java:70)
    at javafx.scene.control.Control$12.invalidated(Control.java:972)
    at javafx.beans.property.StringPropertyBase.markInvalid(StringPropertyBase.java:127)
    at javafx.beans.property.StringPropertyBase.set(StringPropertyBase.java:161)
    at com.sun.javafx.css.StyleableStringProperty.set(StyleableStringProperty.java:71)
    at javafx.scene.control.Control$12.set(Control.java:964)
    at com.sun.javafx.css.StyleableStringProperty.applyStyle(StyleableStringProperty.java:59)
    at com.sun.javafx.css.StyleableStringProperty.applyStyle(StyleableStringProperty.java:31)
    at com.sun.javafx.css.StyleableProperty.set(StyleableProperty.java:70)
    at com.sun.javafx.css.StyleHelper.transitionToState(StyleHelper.java:902)
    at javafx.scene.Node.impl_processCSS(Node.java:7415)
    at javafx.scene.Parent.impl_processCSS(Parent.java:1146)
    at javafx.scene.control.Control.impl_processCSS(Control.java:1154)
    at com.sun.javafx.scene.control.skin.VirtualFlow.setCellIndex(VirtualFlow.java:1598)
    at com.sun.javafx.scene.control.skin.VirtualFlow.addTrailingCells(VirtualFlow.java:1114)
    at com.sun.javafx.scene.control.skin.VirtualFlow.layoutChildren(VirtualFlow.java:1007)
    at javafx.scene.Parent.layout(Parent.java:1018)
    at javafx.scene.Parent.layout(Parent.java:1028)
    at javafx.scene.Parent.layout(Parent.java:1028)
    at javafx.scene.Parent.layout(Parent.java:1028)
    at javafx.scene.Parent.layout(Parent.java:1028)
    at javafx.scene.Parent.layout(Parent.java:1028)
    at javafx.scene.Scene.layoutDirtyRoots(Scene.java:516)
    at javafx.scene.Scene.doLayoutPass(Scene.java:487)
    at javafx.scene.Scene.access$3900(Scene.java:170)
    at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2203)
    at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:363)
    at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:460)
    at com.sun.javafx.tk.quantum.QuantumToolkit$9.run(QuantumToolkit.java:329)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:76)
Is this a bug in JavaFX ? otherwise which is the correct way to obtain the row number in the string converter of the TextFieldTableCell ?

Answer 1

To get the content of a cell you have to make  setCellSelectionEnabled(true);
To get the selected row or selected column you can use the following: 
{code}
        table.getSelectionModel().setSelectionMode(SelectionMode.SINGLE);
        table.getSelectionModel().setCellSelectionEnabled(true);
        table.getSelectionModel().selectedItemProperty().addListener(new ChangeListener() {
            @Override
            public void changed(ObservableValue observable, Object oldvalue, Object newValue) {
                for (TablePosition t : (ObservableList<TablePosition>) table.getSelectionModel().getSelectedCells()) {
                    System.out.println("The selected column is: " + t.getColumn());
                    System.out.println("The selected row is: " + t.getRow());
{code}
If you need only the selected row  (TextFieldTableCell  selected)you can use the following:
{code}
        table.getSelectionModel().selectedIndexProperty().addListener(new ChangeListener<Number>() {
            @Override
            public void changed(ObservableValue observable, Number oldvalue, Number newValue) {
                System.out.println("Selected row is " + newValue);
{code}