JavaFX8TreeTableColumn setText ClassCastException

Question

我的情况是:我有一个 TreeTableView 这有一个 TreeTableColumn.列标题文本将在运行时更改。

当我通过改变文本 setText 或 textProperty().bind(...) 在我展示舞台之前, 一切正常.
但如果我改变文本 显示后 舞台上，我得到了一个巨大的 java.lang.ClassCastException.
我已经用Java SE1.8.0b132和Java1.8.0_20b17EA尝试过这个。

除了重新创建 TreeTableColumn?

我的示例代码:

    TreeTableView<String> ttv = new TreeTableView<>();
    TreeTableColumn<String, String> ttc = new TreeTableColumn<>();
    ttc.setText("Hello");
    ttv.getColumns().add(ttc);
    ttv.setOnMouseClicked(new EventHandler<MouseEvent>() {
        @Override
        public void handle(MouseEvent t) {
            ttc.setText("World");
        }
    });

    Scene scene = new Scene(ttv);

    primaryStage.setTitle("Hello World!");
    primaryStage.setScene(scene);
    primaryStage.show();

例外（点击后 TreeTableView):

Exception in Application start method
java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:367)
    at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:305)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767)
Caused by: java.lang.RuntimeException: Exception in Application start method
    at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:894)
    at com.sun.javafx.application.LauncherImpl.access$000(LauncherImpl.java:56)
    at com.sun.javafx.application.LauncherImpl$1.run(LauncherImpl.java:158)
    at java.lang.Thread.run(Thread.java:744)
Caused by: java.lang.ClassCastException: javafx.scene.control.TreeTableColumn cannot be cast to javafx.scene.control.TableColumn
    at com.sun.javafx.scene.control.skin.TableHeaderRow$10.invalidated(TableHeaderRow.java:277)
    at javafx.beans.WeakInvalidationListener.invalidated(WeakInvalidationListener.java:83)
    at com.sun.javafx.binding.ExpressionHelper$Generic.fireValueChangedEvent(ExpressionHelper.java:339)
    at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:80)
    at javafx.beans.property.StringPropertyBase.fireValueChangedEvent(StringPropertyBase.java:103)
    at javafx.beans.property.StringPropertyBase.markInvalid(StringPropertyBase.java:110)
    at javafx.beans.property.StringPropertyBase.set(StringPropertyBase.java:143)
    at javafx.beans.property.StringPropertyBase.set(StringPropertyBase.java:49)
    at javafx.scene.control.TableColumnBase.setText(TableColumnBase.java:189)
    at com.kalasch.test.TreeTableTest.start(TreeTableTest.java:39)
    at com.sun.javafx.application.LauncherImpl$8.run(LauncherImpl.java:837)
    at com.sun.javafx.application.PlatformImpl$7.run(PlatformImpl.java:335)
    at com.sun.javafx.application.PlatformImpl$6$1.run(PlatformImpl.java:301)
    at com.sun.javafx.application.PlatformImpl$6$1.run(PlatformImpl.java:298)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.application.PlatformImpl$6.run(PlatformImpl.java:298)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.access$300(WinApplication.java:39)
    at com.sun.glass.ui.win.WinApplication$4$1.run(WinApplication.java:112)
    ... 1 more
Exception running application com.kalasch.test.TreeTableTest

更新08/04/2014:
向javafx-jira提交错误报告:
https://bugs.openjdk.java.net/browse/JDK-8095931

更新08/05/2014:
修复版本将是: 8u40
@thatjavaguy09修复确实有效。

问候，卡尔施

Answer 1

查看堆栈跟踪，似乎问题是您的TreeTableColumn试图转换为TableColumn，这是抛出ClassCastException的原因（因为这实际上是一个无效的转换）。

看来电话是从桌上打来的。作废。看着这个方法，我看到演员来自哪里。

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));
        }
    }
};

这可能是JDK的错误。我相信正确的转换应该是TableColumnBase。我会把这个提交给他们的bug跟踪器:

https://javafx-jira.kenai.com/secure/Dashboard.jspa