為什么我用io.datafx得到java.lang.NullPointerException？

Question

我正在發現JAVAFX，我意識到對項目結構進行了重構1小時之后，也許這是愚蠢的，但我真的不明白這個問題。 它在重構名稱和包文件之前有效。 我的項目現在在maven下（我不知道是否改變了一些東西）這是我的錯誤：

GRAVE: null
io.datafx.controller.flow.FlowException: io.datafx.controller.FxmlLoadException: java.lang.reflect.InvocationTargetException
    at io.datafx.controller.flow.FlowHandler.start(FlowHandler.java:143)
    at io.datafx.controller.flow.FlowHandler.start(FlowHandler.java:101)
    at maxiRename.controller.MainController.initialize(MainController.java:88)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2548)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2441)
    at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2409)
    at io.datafx.controller.ViewFactory.createByController(ViewFactory.java:161)
    at io.datafx.controller.flow.FlowHandler.start(FlowHandler.java:140)
    at maxiRenameApp.MainMaxiFilm.start(MainMaxiFilm.java:27)
    at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$162(LauncherImpl.java:863)
    at com.sun.javafx.application.PlatformImpl.lambda$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:745)
Caused by: io.datafx.controller.FxmlLoadException: java.lang.reflect.InvocationTargetException
    at io.datafx.controller.ViewFactory.createByController(ViewFactory.java:180)
    at io.datafx.controller.flow.FlowHandler.start(FlowHandler.java:140)
    ... 17 more
Caused by: 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 io.datafx.controller.ViewFactory.createByController(ViewFactory.java:175)
    ... 18 more
Caused by: java.lang.NullPointerException
    at maxiRename.controller.SideMenuController.init(SideMenuController.java:65)
    ... 23 more

這是我的sidebarMenuController.java：

package maxiRename.controller;

import javax.annotation.PostConstruct;

import com.jfoenix.controls.JFXListView;

import io.datafx.controller.FXMLController;
import io.datafx.controller.flow.Flow;
import io.datafx.controller.flow.FlowException;
import io.datafx.controller.flow.FlowHandler;
import io.datafx.controller.flow.context.FXMLViewFlowContext;
import io.datafx.controller.flow.context.ViewFlowContext;
import io.datafx.controller.util.VetoException;
import javafx.fxml.FXML;
import javafx.scene.Node;
import javafx.scene.control.Label;
import javafx.scene.image.ImageView;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;

@FXMLController(value = "/maxiRename/view/SideMenu.fxml", title = "Material Design Example")
public class SideMenuController {


    @FXML
    private StackPane root;

    @FXML
    private VBox listViewDrawer;

    @FXML
    private ImageView imageTopDrawer;

    @FXML
    private JFXListView<?> list1;

    @FXML
    private Label home;

    @FXML
    private JFXListView<?> subList;

    @FXML
    private Label musics;

    @FXML
    private Label movies;

    @FXML
    private Label series;

    @FXML
    private Label help;

    @FXML
    private Label exit;

    @FXMLViewFlowContext
    private ViewFlowContext context;

    @PostConstruct
    public void init() throws FlowException, VetoException {
        list1.propagateMouseEventsToParent();
        System.out.println(context);
        FlowHandler contentFlowHandler = (FlowHandler) context.getRegisteredObject("ContentFlowHandler");
        Flow contentFlow = (Flow) context.getRegisteredObject("ContentFlow");
        System.out.println(subList.getItems().get(0));
        bindNodeToController(home, HomeController.class, contentFlow, contentFlowHandler);
        bindNodeToController(musics, MusicsSettingsController.class, contentFlow, contentFlowHandler);
        bindNodeToController(movies, MoviesSettingsController.class, contentFlow, contentFlowHandler);
        bindNodeToController(series, SeriesSettingsController.class, contentFlow, contentFlowHandler);
        bindNodeToController(help, HelpController.class, contentFlow, contentFlowHandler);
    }

    private void bindNodeToController(Node node, Class<?> controllerClass, Flow flow, FlowHandler flowHandler) {
        flow.withGlobalLink(node.getId(), controllerClass);
        node.setOnMouseClicked((e) -> {
            try {               
                flowHandler.handle(node.getId());               
            } catch (Exception e1) {
                e1.printStackTrace();
            }
        });
    }
}

我的結構文件，如果這可以幫助您：

我的第一個想法是在一條糟糕的道路或類似的東西，但如果我改變它我得到錯誤'沒有設置位置'所以我想我的路徑是好的。

@FXMLController(value = "/maxiRename/view/SideMenu.fxml", title = "Material Design Example")

編輯：maxiRename.controller.SideMenuController.init（SideMenuController.java:65）是：

FlowHandler contentFlowHandler = (FlowHandler) context.getRegisteredObject("ContentFlowHandler");
and context is null

Answer 1

好的我找到了！

這是名為'flow'的庫。 在8.0版本中它可以工作但在8.1版本中沒有。

從maven我有這個：

<dependency>
    <groupId>io.datafx</groupId>
    <artifactId>flow</artifactId>
    <version>8.1</version>
</dependency>

現在我有這個：

<dependency>
        <groupId>io.datafx</groupId>
        <artifactId>flow</artifactId>
        <version>8.0</version>
    </dependency>

謝謝，我希望這對其他人有用;）