Javafx 异常初始化错误

Question

我之前看过的帖子对我来说没有用。错误是因为我没有使用任何 fxml 加载器。但它在任何 fxml 文件中都不起作用。您能否帮助我找到错误并为我链接一些资源，以更好地理解与此类似的所有错误。我不断收到类似的错误。提前致谢。

我的Main.java

package sample;

import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Group;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.image.ImageView;
import javafx.stage.Stage;
import javafx.animation.TranslateTransition;

import javafx.scene.*;
import javafx.util.Duration;

import java.awt.event.ActionEvent;

public class Main extends Application {

        private final static javafx.scene.image.Image tree1 = new javafx.scene.image.Image(Main.class.getResource("/images/Tree-1.png").toString());
        private final static javafx.scene.image.Image tree2 = new javafx.scene.image.Image(Main.class.getResource("/images/2.png").toString());
        private final static javafx.scene.image.Image tree3 = new javafx.scene.image.Image(Main.class.getResource("/images/3.png").toString());
        private final static javafx.scene.image.Image tree4 = new javafx.scene.image.Image(Main.class.getResource("/images/4.png").toString());
        private final static javafx.scene.image.Image tree5 = new javafx.scene.image.Image(Main.class.getResource("/images/5.png").toString());
        private final static javafx.scene.image.Image tree6 = new javafx.scene.image.Image(Main.class.getResource("/images/6.png").toString());
        private final static javafx.scene.image.Image tree7 = new javafx.scene.image.Image(Main.class.getResource("/images/7.png").toString());
        private final static javafx.scene.image.Image tree8 = new javafx.scene.image.Image(Main.class.getResource("/images/8.png").toString());




  private Group tree;
    @Override
    public void start(Stage primaryStage) throws Exception{


        final ImageView t1 = new ImageView(tree1);
        final ImageView t2 = new ImageView(tree2);
        final ImageView t3 = new ImageView(tree3);
        final ImageView t4 = new ImageView(tree4);
        final ImageView t5 = new ImageView(tree5);
        final ImageView t6 = new ImageView(tree6);
        final ImageView t7 = new ImageView(tree7);
        final ImageView t8 = new ImageView(tree8);

        tree= new Group(t1);
        tree.setTranslateX(200);
        tree.setTranslateY(220);

        Timeline t = new Timeline();
        t.setCycleCount(Timeline.INDEFINITE);

        t.getKeyFrames().add(new KeyFrame(
                Duration.millis(200),
                event ->{

                    tree.getChildren().setAll(t2);
                    }));

        t.getKeyFrames().add(new KeyFrame(
                Duration.millis(300),
                event ->
        {
            tree.getChildren().setAll(t3);
        }));

        t.getKeyFrames().add(new KeyFrame(
                Duration.millis(400),
               event ->
        {
            tree.getChildren().setAll(t4);
        }));

        t.getKeyFrames().add(new KeyFrame(
                Duration.millis(500),
                 event ->
        {
            tree.getChildren().setAll(t5);
        }));

        t.getKeyFrames().add(new KeyFrame(
                Duration.millis(600),
                event ->
        {
            tree.getChildren().setAll(t6);
        }));

        t.getKeyFrames().add(new KeyFrame(
                Duration.millis(700),
                 event ->
        {
            tree.getChildren().setAll(t7);
        }));

        t.getKeyFrames().add(new KeyFrame(
                Duration.millis(800),
                event ->
        {
            tree.getChildren().setAll(t8);
        }));
        t.play();

        primaryStage.setScene(new Scene(tree,700,800));
        primaryStage.setTitle("Learning Animation");
        primaryStage.show();

    }


    public static void main(String[] args) {

        Application.launch(args);
        launch(args);

    }
}

错误:

"C:\Program Files\Java\jdk1.8.0_131\bin\java.exe" "-

javaagent:C:\Users\Eli\AppData\Roaming\JetBrains\IntelliJ IDEA Community Edition 2018.1.5\lib\idea_rt.jar=7355:C:\Users\Eli\AppData\Roaming\JetBrains\IntelliJ IDEA Community Edition 2018.1.5\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_131\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_131\jre\lib\rt.jar;F:\pomodoro\out\production\pomodoro" sample.Main
    Exception in thread "JavaFX Application Thread" Exception in thread "main" java.lang.ExceptionInInitializerError
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:348)
        at com.sun.javafx.application.LauncherImpl.lambda$launchApplicationWithArgs$156(LauncherImpl.java:352)
        at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$175(PlatformImpl.java:326)
        at com.sun.javafx.application.PlatformImpl.lambda$null$173(PlatformImpl.java:295)
        at java.security.AccessController.doPrivileged(Native Method)
        at com.sun.javafx.application.PlatformImpl.lambda$runLater$174(PlatformImpl.java:294)
        at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
        at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
        at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
        at java.lang.Thread.run(Thread.java:748)
    Caused by: java.lang.NullPointerException
        at sample.Main.<clinit>(Main.java:21)
        ... 11 more
    java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767)
    Caused by: java.lang.NullPointerException
        at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:383)
        at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328)

Answer 1

发生这种情况是因为在这一行

 private final static javafx.scene.image.Image tree1 = new javafx.scene.image.Image(Main.class.getResource("/images/Tree-1.png").toString());

您指的是默认 FX 加载程序找不到的路径

您应该检查存储图像的位置，但这里是示例结构，效果很好

example structure