java.lang.NullPointerException: Ort ist erforderlich. Netbeans 8.2

Question

Ich versuche, mein JavaFX-Programm zwischen den Bildschirmen zu wechseln, wenn eine Taste gedrückt wird, aber ich habe Schwierigkeiten damit. Ich erhalte eine lange Reihe von Fehlermeldungen, von denen eine "java.lang.NullPointerException: Location is required" ist. Alle meine Dateien für das Programm befinden sich im selben Paket.

Haupt Methode:

package therealcompsciia; 

import javafx.application.Application; 
import javafx.fxml.FXMLLoader; 
import javafx.scene.Parent; 
import javafx.scene.Scene; 
import javafx.stage.Stage; 

public class TheRealCompSciIA extends Application { 

    @Override 
    public void start(Stage stage) throws Exception { 
     Parent root = FXMLLoader.load(getClass().getResource("NewSoccerAppInitialScreen.fxml")); 

     Scene scene = new Scene(root); 

     stage.setScene(scene); 
     stage.show(); 
    } 
/** 
* @param args the command line arguments 
*/ 
public static void main(String[] args) { 
    launch(args); 
} 

} 

Hier ist der Code für das Einstiegsbild FXML, NewSoccerAppInitialScreen.fxml

<?xml version="1.0" encoding="UTF-8"?> 

<?import javafx.scene.control.Button?> 
<?import javafx.scene.control.Label?> 
<?import javafx.scene.image.Image?> 
<?import javafx.scene.image.ImageView?> 
<?import javafx.scene.layout.AnchorPane?> 
<?import javafx.scene.text.Font?> 

<AnchorPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="336.0" prefWidth="456.0" xmlns="http://javafx.com/javafx/8.0.111" xmlns:fx="http://javafx.com/fxml/1" fx:controller="NewSoccerAppInitialScreenController"> 
    <children> 
    <Button fx:id="PlayerProfiles" alignment="CENTER" layoutX="15.0" layoutY="148.0" mnemonicParsing="false" onAction="#playerprofilesButton" prefHeight="90.0" prefWidth="134.0" text="Player Profiles" textFill="#bf1616"> 
    <font> 
     <Font size="14.0" /> 
    </font></Button> 
    <Button fx:id="Statistics" alignment="CENTER" layoutX="162.0" layoutY="148.0" mnemonicParsing="false" onAction="#statisticsButton" prefHeight="90.0" prefWidth="134.0" text="Statistics" textFill="#bf1616"> 
    <font> 
     <Font size="14.0" /> 
    </font> 
    </Button> 
    <Button fx:id="FormationEditor" alignment="CENTER" layoutX="308.0" layoutY="148.0" mnemonicParsing="false" onAction="#formationeditorButton" prefHeight="90.0" prefWidth="134.0" text="Formation Editor" textFill="#bf1616"> 
    <font> 
     <Font size="14.0" /> 
    </font> 
    </Button> 
    <ImageView fitHeight="98.0" fitWidth="198.0" layoutY="238.0" pickOnBounds="true" preserveRatio="true"> 
    <image> 
     <Image url="@CompSci%20IA%20Grass.jpe" /> 
    </image> 
    </ImageView> 
    <ImageView fitHeight="98.0" fitWidth="198.0" layoutX="135.0" layoutY="238.0" pickOnBounds="true" preserveRatio="true"> 
    <image> 
     <Image url="@CompSci%20IA%20Grass.jpe" /> 
    </image> 
    </ImageView> 
    <ImageView fitHeight="98.0" fitWidth="198.0" layoutX="255.0" layoutY="238.0" pickOnBounds="true" preserveRatio="true"> 
    <image> 
     <Image url="@CompSci%20IA%20Grass.jpe" /> 
    </image> 
    </ImageView> 
    <ImageView fitHeight="98.0" fitWidth="198.0" layoutX="316.0" layoutY="238.0" pickOnBounds="true" preserveRatio="true"> 
    <image> 
     <Image url="@CompSci%20IA%20Grass.jpe" /> 
    </image> 
    </ImageView> 
    <ImageView fitHeight="78.0" fitWidth="107.0" layoutX="296.0" layoutY="76.0" pickOnBounds="true" preserveRatio="true"> 
    <image> 
     <Image url="@CompSci%20IA%20Goal.jpe" /> 
    </image> 
    </ImageView> 
    <ImageView fitHeight="98.0" fitWidth="64.0" layoutX="63.0" layoutY="73.0" pickOnBounds="true" preserveRatio="true"> 
    <image> 
     <Image url="@CompSci%20IA%20Soccer%20Ball.jpe" /> 
    </image> 
    </ImageView> 
    <Label layoutX="114.0" layoutY="30.0" text="DM Soccer Manager" textFill="#bf1616"> 
    <font> 
     <Font name="System Bold" size="24.0" /> 
    </font> 
    </Label> 
    </children> 
    </AnchorPane> 

Hier ist der Code für meinen ersten Bildschirm-Controller ist, NewSoccerAppInitialScreenController.java

import java.io.IOException; 
import java.net.URL; 
import java.util.ResourceBundle; 
import javafx.event.ActionEvent; 
import javafx.fxml.FXML; 
import javafx.fxml.FXMLLoader; 
import javafx.fxml.Initializable; 
import javafx.scene.Node; 
import javafx.scene.Parent; 
import javafx.scene.Scene; 
import javafx.scene.control.Button; 
import javafx.stage.Stage; 

public class NewSoccerAppInitialScreenController implements Initializable { 

@FXML 
private Button PlayerProfiles; 
@FXML 
private Button Statistics; 
@FXML 
private Button FormationEditor; 

    @FXML 
    private void formationeditorButton(ActionEvent event) throws IOException{ 
    Parent FXMLDocument2Parent = FXMLLoader.load(getClass().getClassLoader().getResource("fxml_NewFormationsInitialScreen.fxml")); 
    Scene FXMLDocument2Scene = new Scene(FXMLDocument2Parent); 
    Stage AppStage = (Stage) ((Node) event.getSource()).getScene().getWindow(); 
    //AppStage.hide(); 
    AppStage.setScene(FXMLDocument2Scene); 
    AppStage.show(); 
    } 

    @FXML 
    private void playerprofilesButton(ActionEvent event) throws IOException{ 
    Parent FXMLDocument2Parent = FXMLLoader.load(getClass().getClassLoader().getResource("fxml_NewPlayerProfilesInitial.fxml")); 
    Scene FXMLDocument2Scene = new Scene(FXMLDocument2Parent); 
    Stage AppStage = (Stage) ((Node) event.getSource()).getScene().getWindow(); 
    //AppStage.hide(); 
    AppStage.setScene(FXMLDocument2Scene); 
    AppStage.show(); 
    } 

    @FXML 
    private void statisticsButton(ActionEvent event) throws IOException{ 
    Parent FXMLDocument2Parent = FXMLLoader.load(getClass().getClassLoader().getResource("fxml_NewStatisticsInitial.fxml")); 
    Scene FXMLDocument2Scene = new Scene(FXMLDocument2Parent); 
    Stage AppStage = (Stage) ((Node) event.getSource()).getScene().getWindow(); 
    //AppStage.hide(); 
    AppStage.setScene(FXMLDocument2Scene); 
    AppStage.show(); 
    } 


@Override 
public void initialize(URL url, ResourceBundle rb) { 
    // TODO 
}  

} 

Hier ist die Fehlermeldung:

Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException 
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1774) 
at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657) 
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86) 
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238) 
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191) 
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59) 
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58) 
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) 
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56) 
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) 
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56) 
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) 
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74) 
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49) 
at javafx.event.Event.fireEvent(Event.java:198) 
at javafx.scene.Node.fireEvent(Node.java:8413) 
at javafx.scene.control.Button.fire(Button.java:185) 
at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:182) 
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:96) 
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:89) 
at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218) 
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80) 
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238) 
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191) 
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59) 
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58) 
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) 
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56) 
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) 
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56) 
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114) 
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74) 
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54) 
at javafx.event.Event.fireEvent(Event.java:198) 
at javafx.scene.Scene$MouseHandler.process(Scene.java:3757) 
at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485) 
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762) 
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494) 
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:381) 
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295) 
at java.security.AccessController.doPrivileged(Native Method) 
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$354(GlassViewEventHandler.java:417) 
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389) 
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:416) 
at com.sun.glass.ui.View.handleMouseEvent(View.java:555) 
at com.sun.glass.ui.View.notifyMouse(View.java:937) 
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method) 
at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191) 
at java.lang.Thread.run(Thread.java:745) 
Caused by: java.lang.reflect.InvocationTargetException 
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
at java.lang.reflect.Method.invoke(Method.java:498) 
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71) 
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source) 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
at java.lang.reflect.Method.invoke(Method.java:498) 
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275) 
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1769) 
... 48 more 
Caused by: java.lang.NullPointerException: Location is required. 
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3207) 
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3175) 
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3148) 
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3124) 
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3104) 
at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3097) 
at NewSoccerAppInitialScreenController.formationeditorButton(NewSoccerAppInitialScreenController.java:37) 
... 58 more 

Ich bin mir nicht sicher, was das Problem ist. Die Dateinamen sind korrekt und alle existieren in demselben Paket unter demselben Projekt. Mein Startbildschirm wird geladen und ist sichtbar, aber sobald ich auf eine der Schaltflächen klicke, um mich zu einem neuen Bildschirm zu schicken, wird die obige Fehlermeldung angezeigt.

Answer 1

Ihr Problem scheint das gleiche zu sein wie die 2:..

• JavaFX "Location is required." even though it is in the same package

• "Location is required" exception when loading FXML file