使用Java桥API加载fxml文件时发生LoadException

我想在用户在JxBrowser中执行某些操作后打开新的JavaFX窗口。我插入到Javascript中的Java对象的示例代码

public class JavaApp {
    public void openNewWindow() {
        FXMLLoader loader = new FXMLLoader(getClass().getResource("new-window.fxml"));
        Parent root = null;
        try {
            root = loader.load();
        } catch (IOException e) {
            e.printStackTrace();
            return;
        }
        Stage newStage = new Stage();
        newStage.setTitle("New window");
        newStage.setScene(new Scene(root, 100, 100));
        newStage.show();
    }
}

从Javascript调用

openNewWindow

后，我得到以下堆栈跟踪：

javafx.fxml.LoadException: /home/asdfzxc/Projects/JxBrowserError/out/production/JxBrowserError/sample/new-window.fxml
at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2601)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2579)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2441)
at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2409)
at sample.Controller$JavaApp.openNewWindow(Controller.java:66)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.teamdev.jxbrowser.chromium.JSContext.a(SourceFile:1446)
at com.teamdev.jxbrowser.chromium.JSContext$a.onMessageReceived(SourceFile:280)
at com.teamdev.jxbrowser.chromium.internal.ipc.p.a(SourceFile:1082)
at com.teamdev.jxbrowser.chromium.internal.ipc.q.run(SourceFile:66)
at com.teamdev.jxbrowser.chromium.internal.q.run(SourceFile:63)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
at javafx.fxml.FXMLLoader.loadTypeForPackage(FXMLLoader.java:2916)
at javafx.fxml.FXMLLoader.getType(FXMLLoader.java:2870)
at javafx.fxml.FXMLLoader.createElement(FXMLLoader.java:2758)
at javafx.fxml.FXMLLoader.processStartElement(FXMLLoader.java:2704)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2527)
... 17 more

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但是，如果代码是从JavaFX控制器内部调用的，则打开新窗口是有效的。我应该怎么做才能使

fxmloader

在这种情况下工作？

我想我自己找到了答案。问题显然是，这段代码应该在JavaFX线程中运行。可以这样做：

public class JavaApp {
    public void openNewWindow() {
        Platform.runLater(() -> {
            try {
                FXMLLoader loader = new FXMLLoader(getClass().getResource("new-window.fxml"));
                Parent root = loader.load();
                Stage newStage = new Stage();
                newStage.setTitle("New window");
                newStage.setScene(new Scene(root, 100, 100));
                newStage.show();
            } catch (IOException e) {
                e.printStackTrace();
            }
        });
    }
}