如何在Java 8 Ubuntu上启动JavaFX应用程序?

时间:2017-06-28 13:49:07

标签: java javafx javafx-8

我试图启动应用程序,但遇到错误:

java.lang.ClassNotFoundException: com.sun.glass.ui.gtk.GtkPlatformFactory   at
  java.net.URLClassLoader.findClass(URLClassLoader.java:381)  at
  java.lang.ClassLoader.loadClass(ClassLoader.java:424)   at
  java.lang.ClassLoader.loadClass(ClassLoader.java:357)   at
  java.lang.Class.forName0(Native Method)   at
  java.lang.Class.forName(Class.java:264)   at
  com.sun.glass.ui.PlatformFactory.getPlatformFactory(PlatformFactory.java:42)
    at com.sun.glass.ui.Application.run(Application.java:146)   at
  com.sun.javafx.tk.quantum.QuantumToolkit.startup(QuantumToolkit.java:257)
    at
  com.sun.javafx.application.PlatformImpl.startup(PlatformImpl.java:211)
    at
  com.sun.javafx.application.LauncherImpl.startToolkit(LauncherImpl.java:675)
    at
  com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:337)
    at
  com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328)
    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
  sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767)
  Exception in thread "main" java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)  at
  sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at
  sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)   at
  sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767)
  Caused by: java.lang.NullPointerException   at
  com.sun.glass.ui.Application.run(Application.java:146)  at
  com.sun.javafx.tk.quantum.QuantumToolkit.startup(QuantumToolkit.java:257)
    at
  com.sun.javafx.application.PlatformImpl.startup(PlatformImpl.java:211)
    at
  com.sun.javafx.application.LauncherImpl.startToolkit(LauncherImpl.java:675)
    at
  com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:337)
    at
  com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328)
    ... 5 more 

在堆栈跟踪结束时发送消息Failed to load Glass factory class

我还尝试将javafx添加为maven依赖项,并将此jar添加到classpath中。我将IDEA用于我的项目。

更新

我的代码很简单:Hello JavaFX exmaple:

public class Application extends javafx.application.Application {

    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage primaryStage) {
        Button btn = new Button();
        btn.setText("Say 'Hello World'");
        btn.setOnAction(new EventHandler<ActionEvent>() {

            public void handle(ActionEvent event) {
                System.out.println("Hello World!");
            }
        });

        StackPane root = new StackPane();
        root.getChildren().add(btn);

        Scene scene = new Scene(root, 300, 250);

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

更新1:

我使用了debug,发现在第1057行的ThreadPoolExecutor.java中引发了excpetion。另外:

enter image description here

是的!执行此代码片段后,第一个异常出现在项目控制台中。

2 个答案:

答案 0 :(得分:0)

您需要下载并安装openjfx lib。

sudo apt install openjfx应该可以解决问题。

答案 1 :(得分:0)

好的,我明白了。

首先我的jdk坏了,所以我下载了新的。

即使您在“项目”标签中更改了sdk,也可以在IDEA中忘记更改“模块”部分中的项目sdk。