Question

所以我试图启动我的JavaFX应用程序并出现堆栈跟踪错误：

Exception in thread "main" java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at sun.launcher.LauncherHelper$FXHelper.main(Unknown Source)
Caused by: java.lang.NullPointerException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(Unknown Source)
    at com.sun.javafx.application.LauncherImpl.launchApplication(Unknown Source)

我想知道发生了什么。在堆栈跟踪的底部，它表示在启动（args）方法中有一个NullPointer。我尝试了一切，但我无法让它工作。这是我的代码：

public class Main extends Application{
public void main(String[] args){
    launch(args);
}

//START
//GUI

@Override
public void start(Stage primarystage) throws Exception {
    SplitPane fullpane = new SplitPane();
    //DECK
    ScrollPane deckscrollpane = new ScrollPane();
    AnchorPane deck = new AnchorPane();
    deck.setOnMouseClicked((e)->{
        System.out.println(e.getSceneX());
        System.out.println(e.getSceneY());
    });
    Rectangle rec = new Rectangle();
    rec.setTranslateX(23);
    rec.setTranslateY(20);
    rec.setWidth(200);
    rec.setHeight(300);
    deck.getChildren().add(rec);
    deckscrollpane.setContent(deck);
    //MAP
    StackPane map = new StackPane();
    fullpane.getItems().addAll(deckscrollpane, map);
    fullpane.setDividerPositions(0.4f, 0.6f);
    Scene scn = new Scene(fullpane, 700, 700);
    primarystage.setScene(scn);
    primarystage.show();
}
}

我是JavaFX的新手，我希望有经验的人可以解释我应该如何解决这个问题。我的IDE（Eclipse）也没有在代码中显示任何错误。运行程序时，只会弹出错误。我安装了JavaFX插件（我认为它被称为类似e（fx）clipse或类似的东西）。一点帮助？

JavaFX launch（args）方法抛出java.lang.reflect.InvocationTargetException，java.lang.NullPointerException

0 个答案: