I get Null Pointer Exception while I am trying to set the controller in initialize method.
Here is my Main class:
public class Main extends Application {
@Override
public void start(Stage stage) throws IOException {
Locale.setDefault(new Locale("en"));
ResourceBundle resourceBundle = ResourceBundle.getBundle("bundles.language");
FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("/fxml/mainBorderPane.fxml"),resourceBundle);
Parent parent = fxmlLoader.load();
Scene scene = new Scene(parent);
stage.setScene(scene);
stage.setTitle(resourceBundle.getString("title.app"));
stage.show();
ConnectionClass.initializeDB();
}
public static void main(String[] args) {
launch();
}
}
Main Controller class:
public class MainController {
private MenuButtonsController menuButtonsController;
@FXML
private BorderPane mainBorderPane;
@FXML
private void initialize(){
menuButtonsController.setMainController(this);
}
public void setCenter(String fxml){
ResourceBundle resourceBundle = ResourceBundle.getBundle("bundles.language");
FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource(fxml),resourceBundle);
Parent parent = null;
try {
parent = fxmlLoader.load();
} catch (IOException ioe){
ioe.printStackTrace();
}
mainBorderPane.setCenter(parent);
}
}
Menu buttons Controller:
public class MenuButtonsController {
private final String USERS_LIB_FXML = "/fxml/usersMenu.fxml";
private final String BOOKS_LIB_FXML = "/fxml/bookLib.fxml";
private final String GAMES_LIB_FXML = "/fxml/gamesLib.fxml";
private final String MOVIES_LIB_FXML = "/fxml/movieLib.fxml";
private final String OPTIONS_LIB_FXML = "/fxml/options.fxml";
@FXML
private ToggleGroup menuToggleGroup;
private MainController mainController;
@FXML
public void openUsers() {
mainController.setCenter(USERS_LIB_FXML);
}
@FXML
public void openBookLib() {
mainController.setCenter(BOOKS_LIB_FXML);
}
@FXML
public void openMovieLib() {
mainController.setCenter(MOVIES_LIB_FXML);
}
@FXML
public void openGameLib() {
mainController.setCenter(GAMES_LIB_FXML);
}
@FXML
public void openOptions() {
mainController.setCenter(OPTIONS_LIB_FXML);
}
@FXML
public void handleExit() {
if (menuToggleGroup.getSelectedToggle() != null) {
menuToggleGroup.getSelectedToggle().setSelected(false);
}
Platform.exit();
}
public void setMainController(MainController mainController) {
this.mainController = mainController;
}
}
Main Window FXML:
<BorderPane fx:id="mainBorderPane" prefHeight="800.0" prefWidth="1200.0" styleClass="borderPane"
stylesheets="@../css/mainBorderPane_stylesheet.css" xmlns="http://javafx.com/javafx/11.0.1"
xmlns:fx="http://javafx.com/fxml/1" fx:controller="com.kodpalmowy.controllers.MainController">
<left>
<VBox prefHeight="200.0" prefWidth="100.0" BorderPane.alignment="CENTER">
<fx:include fx:id="mainMenu" source="menuButtons.fxml" />
</VBox>
</left>
<center>
<HBox prefHeight="100.0" prefWidth="200.0" BorderPane.alignment="CENTER">
<fx:include source="welcomeScreen.fxml" />
</HBox>
</center>
</BorderPane>
Stack:
Exception in Application start method
java.lang.reflect.InvocationTargetException
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:567)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:464)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:363)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:567)
at java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:1051)
Caused by: java.lang.RuntimeException: Exception in Application start method
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:900)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:195)
at java.base/java.lang.Thread.run(Thread.java:830)
Caused by: javafx.fxml.LoadException:
/Users/radek/IdeaProjects/EntertainmentLib/target/classes/fxml/mainBorderPane.fxml
at javafx.fxml/javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2625)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2595)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2466)
at javafx.fxml/javafx.fxml.FXMLLoader.load(FXMLLoader.java:2435)
at com.kodpalmowy/com.kodpalmowy.Main.start(Main.java:24)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(LauncherImpl.java:846)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$12(PlatformImpl.java:455)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427)
at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
Caused by: java.lang.reflect.InvocationTargetException
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:567)
at com.sun.javafx.reflect.Trampoline.invoke(MethodUtil.java:76)
at jdk.internal.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:567)
at javafx.base/com.sun.javafx.reflect.MethodUtil.invoke(MethodUtil.java:273)
at javafx.fxml/com.sun.javafx.fxml.MethodHelper.invoke(MethodHelper.java:83)
at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2591)
... 9 more
Caused by: java.lang.NullPointerException
at com.kodpalmowy/com.kodpalmowy.controllers.MainController.initialize(MainController.java:19)
... 20 more
Exception running application com.kodpalmowy.Main
Process finished with exit code 1
The whole code is available on my GitHub: https://github.com/kodpalmowy/EntertainmentLib
Everything was working just fine till I started working on database classes and made little refactoring. When I delete the setter from initialize() method the app starts but obviously I cannot change the scenes. I have been looking for a problem for a long time before I have decided to post here. I didn't gave up just like that so please don't hate me I am new to Java/JavaFX :)
