java NullPointerException@Googlemap lambda表达式？（gMapsfx）

Question

晚上好

最后，我决定加入StackOverflow社区。首先，我想说：我感谢所有让这个社区成为可能的人（对与会者和创作者）。这个网站为我今后的编码问题提供了很多帮助

。。这是个例外。我已经在谷歌上搜索了两天，寻求帮助解决这个问题，但我就是没能解决它。任何帮助或提示都将不胜感激

我的目标是：将GmapsFX添加到JavaFX应用程序中

首先，我试图将GmapsFX添加到JavaFX FXML应用程序中，但收到了许多编译错误，我无法解决这些错误。接下来，我决定采用更简单的方法，并尝试将其实现到普通的JavaFX应用程序中。但令我惊讶的是，我注意到我在JavaFX应用程序中也收到了同样的编译错误

我正在使用：

• 网虫
• 8.2平台
• JDK 1.8
• slf4j-API-1.7.25
• GMapsFX-2.12.0

主要课程：

package fxmaps_2;

import com.lynden.gmapsfx.GoogleMapView;
import com.lynden.gmapsfx.MapComponentInitializedListener;
import com.lynden.gmapsfx.javascript.object.GoogleMap;
import com.lynden.gmapsfx.javascript.object.LatLong;
import com.lynden.gmapsfx.javascript.object.MapOptions;
import com.lynden.gmapsfx.javascript.object.MapTypeIdEnum;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.stage.Stage;

/**
 *
 * @author Tommi
 */
public class FXMaps_2 extends Application implements MapComponentInitializedListener {

    GoogleMapView mapView;
    GoogleMap map;

    @Override
    public void start(Stage primaryStage) {

        mapView = new GoogleMapView();
        mapView.addMapInitializedListener(this);

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

        primaryStage.setTitle("JavaFX gMap");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        launch(fxmaps_2.FXMaps_2.class, new String[0]);
    }

    @Override
    public void mapInitialized() {
        MapOptions mapOptions = new MapOptions();
        mapOptions.center(new LatLong(47.6097, -122.3331))
                .mapType(MapTypeIdEnum.ROADMAP)
                .overviewMapControl(false)
                .panControl(false)
                .rotateControl(false)
                .scaleControl(false)
                .streetViewControl(false)
                .zoomControl(false)
                .zoom(12);
        map = mapView.createMap(mapOptions);
    }

}

尝试运行项目后的输出堆栈：

    ant -f C:\\Users\\Tommi\\Documents\\NetBeansProjects\\FXMaps_2 jfxsa-run
    init:
    Deleting: C:\Users\Tommi\Documents\NetBeansProjects\FXMaps_2\build\built-jar.properties
    deps-jar:
    Updating property file: C:\Users\Tommi\Documents\NetBeansProjects\FXMaps_2\build\built-jar.properties
    compile:
    Deleting directory C:\Users\Tommi\Documents\NetBeansProjects\FXMaps_2\dist\lib
    Copying 2 files to C:\Users\Tommi\Documents\NetBeansProjects\FXMaps_2\dist\lib
    Detected JavaFX Ant API version 1.3
    jfx-deployment:
    jar:
    Copying 14 files to C:\Users\Tommi\Documents\NetBeansProjects\FXMaps_2\dist\run1501132311
    jfx-project-run:
    Executing C:\Users\Tommi\Documents\NetBeansProjects\FXMaps_2\dist\run1501132311\FXMaps_2.jar using platform C:\Program Files (x86)\Java\jdk1.8.0_152\jre/bin/java
    Exception in Application start method
    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 com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:389)
        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$FXHelper.main(LauncherHelper.java:767)
    Caused by: java.lang.RuntimeException: Exception in Application start method
        at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)
        at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$154(LauncherImpl.java:182)
        at java.lang.Thread.run(Thread.java:748)


 Caused by: java.lang.NullPointerException
        at com.lynden.gmapsfx.GoogleMapView.lambda$new$4(GoogleMapView.java:221)
        at com.lynden.gmapsfx.GoogleMapView.<init>(GoogleMapView.java:228)
        at com.lynden.gmapsfx.GoogleMapView.<init>(GoogleMapView.java:159)
        at com.lynden.gmapsfx.GoogleMapView.<init>(GoogleMapView.java:137)
        at com.lynden.gmapsfx.GoogleMapView.<init>(GoogleMapView.java:80)
        at com.lynden.gmapsfx.GoogleMapView.<init>(GoogleMapView.java:76)
        at fxmaps_2.FXMaps_2.start(FXMaps_2.java:30)
        at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$161(LauncherImpl.java:863)
        at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$174(PlatformImpl.java:326)
        at com.sun.javafx.application.PlatformImpl.lambda$null$172(PlatformImpl.java:295)
        at java.security.AccessController.doPrivileged(Native Method)
        at com.sun.javafx.application.PlatformImpl.lambda$runLater$173(PlatformImpl.java:294)
        at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
        at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
        at com.sun.glass.ui.win.WinApplication.lambda$null$147(WinApplication.java:177)
        ... 1 more

    Exception running application fxmaps_2.FXMaps_2
    Java Result: 1
    Deleting directory C:\Users\Tommi\Documents\NetBeansProjects\FXMaps_2\dist\run1501132311
    jfxsa-run:
    BUILD SUCCESSFUL (total time: 1 second)

如果我理解正确的话：这个问题是从GoogleMapView lambda表达式的某个地方产生的？有什么东西导致了nullpointerexception，它再次导致整个“运行”被取消

任何提示/提示都将不胜感激

谢谢

*编辑：添加gfmapsx版本号