Question

我正在尝试在Debian上启动桌面Java应用程序。

这是详细信息：

Debian Stretch 9.9
openjdk-8-jdk-headless：amd64-8u212-b01-1〜deb9u1
openjfx-8u141-b14-3〜deb9u1

该应用程序以前在其他PC上运行正常已经很长时间了。但是在这台机器上，启动我的应用程序后，我看到一个空窗口（没有控件）和以下异常：

java.lang.NullPointerException
    at com.sun.javafx.sg.prism.RegionImageCache.<init>(RegionImageCache.java:71)
    at com.sun.javafx.sg.prism.NGRegion.getImageCache(NGRegion.java:467)
    at com.sun.javafx.sg.prism.NGRegion.renderBackgroundRectangle(NGRegion.java:811)
    at com.sun.javafx.sg.prism.NGRegion.renderAsRectangle(NGRegion.java:751)
    at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:572)
    at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2053)
    at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1945)
    at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:235)
    at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:576)
    at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2053)
    at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1945)
    at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:235)
    at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:576)
    at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2053)
    at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1945)
    at com.sun.javafx.tk.quantum.ViewPainter.doPaint(ViewPainter.java:477)
    at com.sun.javafx.tk.quantum.ViewPainter.paintImpl(ViewPainter.java:330)
    at com.sun.javafx.tk.quantum.UploadingPainter.run(UploadingPainter.java:134)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
    at com.sun.javafx.tk.RenderJob.run(RenderJob.java:58)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at com.sun.javafx.tk.quantum.QuantumRenderer$PipelineRunnable.run(QuantumRenderer.java:125)
    at java.lang.Thread.run(Thread.java:748)

是否有解决此问题的方法？

PS。应用程序代码的一部分

Application.launch(FXMainWindow.class);

public class FXMainWindow extends Application  {

    private ArrayList<ToggleButton> components;

    @Override
    public void start(Stage stage) throws Exception {

        stage.setTitle("App");
        BorderPane root = new BorderPane();

        //bottom
        HBox bottom = new HBox();
        root.setBottom(bottom);

        Button btnRefreshAll = new Button("some");
        HBox.setHgrow(btnRefreshAll, Priority.ALWAYS);
        btnRefreshAll.setMaxWidth(Double.MAX_VALUE);
        btnRefreshAll.setOnAction(event-> {
                new EntityStateRefresher(actions, 10, this).start();
        });
        bottom.getChildren().add(btnRefreshAll);

         .....

        Scene scene = new Scene(root, 210, 363);
        stage.setScene(scene);
        stage.show();

    }

Answer 1

在安装了具有OpenGL支持（i915）的视频驱动程序并将黑名单nouveau列入黑名单之后，问题解决了。

感谢所有评论

JavaFX应用程序在Debian上引发Null Pointer异常

1 个答案: