java - 无法调用“javafx.scene.control.MenuButton.getScene()

Question

我将我的“普通”Javafx 项目转换为 maven 项目以生成模块化图像。现在我按下菜单按钮加载 fxml 文件时收到此错误。尽管出现错误，但仍会加载 fxml。

@FXML
private AnchorPane content = new AnchorPane();
@FXML
private Menu diagramOptions;
@FXML
void openSimpleMode(ActionEvent event) throws InvalidFileFormatException, IOException {
    diagramOptions.setVisible(true);
    FXMLLoader loader = new FXMLLoader(getClass().getResource("/fxml/SimpleMode.fxml"));
    Node simpleModePane = null;
    try {
        simpleModePane = loader.load();
    } catch (Exception e) {
        System.out.println("error in loading pane");
    }
    content.getChildren().clear();
    content.getChildren().add(simpleModePane);
    simplecontroller = loader.getController();
    if (simplecontroller != null) {
        simplecontroller.initData(ldfParser, methods, this);
    } else {
        System.out.println("null Pointer exception");
    }
     System.out.println("error after this");
}

如果我删除diagramOptions.setVisible(true);错误没有出现

完整的堆栈跟踪：

Exception in thread "JavaFX Application Thread" java.lang.NullPointerException: Cannot invoke "javafx.scene.control.MenuButton.getScene()" because the return value of "javafx.scene.control.skin.MenuButtonSkinBase.getSkinnable()" is null
    at javafx.controls/javafx.scene.control.skin.MenuButtonSkinBase.lambda$new$7(MenuButtonSkinBase.java:188)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427)
    at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
    at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174)
    at java.base/java.lang.Thread.run(Thread.java:832)

在将其转换为 Maven 之前一切正常

标签： javamavenjavafx

Answer 1

问题是javafx中的一个错误。我切换到版本 15，一切正常