TreeTable can't change title

Question

I change TreeTableColumn.text but I got a Exception
Exception in thread "JavaFX Application Thread" java.lang.ClassCastException: javafx.scene.control.TreeTableColumn cannot be cast to javafx.scene.control.TableColumn
    at com.sun.javafx.scene.control.skin.TableHeaderRow$10.invalidated(TableHeaderRow.java:277)
so I check TableHeaderRow .
  I find thid method
private final InvalidationListener columnTextListener = new InvalidationListener() {
        @Override public void invalidated(Observable observable) {
            TableColumn<?,?> column = (TableColumn<?,?>) ((StringProperty)observable).getBean();
            CheckMenuItem menuItem = columnMenuItems.get(column);
            if (menuItem != null) {
                menuItem.setText(getText(column.getText(), column));
why don't they use this
TableColumnBase<?,?> column = (TableColumnBase<?,?>) ((StringProperty)observable).getBean();

Answer 1

Looks to me that it was a bug which was fixed for a later Java version than whatever it is that you are using.
See the Java 8u40 source code:
  openjfx/8u40/rt: eb264cdc5828 modules/controls/src/main/java/com/sun/javafx/scene/control/skin/TableHeaderRow.java
    private final InvalidationListener columnTextListener = observable -> {
        TableColumnBase<?,?> column = (TableColumnBase<?,?>) ((StringProperty)observable).getBean();
        CheckMenuItem menuItem = columnMenuItems.get(column);
        if (menuItem != null) {
            menuItem.setText(getText(column.getText(), column));
The source refers to TableColumnBase, not TableColumn.
Upgrade to use Java 8u40+...