I encountered this problem while setting the controller in the main class, this is my main class:
package projeto;
import java.io.IOException;
import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.fxml.FXMLLoader;
import javafx.scene.Scene;
import javafx.scene.layout.AnchorPane;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;
import projeto.resources.FilmeOverviewController;
public class MainApp extends Application {
private Stage primaryStage;
private BorderPane rootLayout;
private ObservableList<Filmes> filmeDados = FXCollections.observableArrayList();
public MainApp() {
filmeDados.add(new Filmes("testmovie1","Acao","1"));
filmeDados.add(new Filmes("testmovie2","Aventura","3"));
filmeDados.add(new Filmes("testmovie3","Acao","2"));
filmeDados.add(new Filmes("testmovie4","Infantil","4"));
}
public ObservableList<Filmes> getfilmeDados(){
return filmeDados;
}
@Override
public void start(Stage primaryStage) {
this.primaryStage = primaryStage;
this.primaryStage.setTitle("CineTudo");
initRootLayout();
showFilmeOverview();
}
public void showFilmeOverview() {
try {
FXMLLoader loader = new FXMLLoader();
loader.setLocation((MainApp.class.getResource("resources/FilmeOverview.fxml")));
//----------------
FilmeOverviewController controller = loader.getController();
controller.setMainApp(this);
//----------------
AnchorPane filmeOverview = (AnchorPane) loader.load();
rootLayout.setCenter(filmeOverview);
}catch (IOException e){
e.printStackTrace();
}
}
public void initRootLayout(){
try {
//Carrega o layout root do arquivo fxml
FXMLLoader loader = new FXMLLoader(MainApp.class.getResource("resources/RootLayout.fxml"));
rootLayout = (BorderPane) loader.load();
Scene cena = new Scene(rootLayout);
primaryStage.setScene(cena);
primaryStage.show();
} catch(IOException e) {
e.printStackTrace();
}
}
public Stage getPrimaryStage() {
return primaryStage;
}
public static void main(String[] args) {
launch(args);
}
}
And this is my controller class:
package projeto.resources;
import javafx.fxml.FXML;
import javafx.scene.control.Label;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import projeto.Filmes;
import projeto.MainApp;
public class FilmeOverviewController {
@FXML
private TableView<Filmes> filmeTable;
@FXML
private TableColumn<Filmes, String> nomeColumn;
@FXML
private TableColumn<Filmes, String> categoriaColumn;
@FXML
private TableColumn<Filmes, String> salaColumn;
@FXML
private Label nomeLabel;
@FXML
private Label salaLabel;
@FXML
private Label categoriaLabel;
@FXML
private Label diretorLabel;
@FXML
private Label duracaoLabel;
@FXML
private Label protagonistaLabel;
@FXML
private Label classificacaoLabel;
// Reference to the main application.
private MainApp mainApp;
public FilmeOverviewController() {
}
@FXML
private void initialize() {
// Initialize the person table with the two columns.
nomeColumn.setCellValueFactory(cellData -> cellData.getValue().getNome());
categoriaColumn.setCellValueFactory(cellData -> cellData.getValue().getCategoria());
salaColumn.setCellValueFactory(cellData -> cellData.getValue().getSala());
}
public void setMainApp(MainApp mainApp) {
this.mainApp = mainApp;
// Add observable list data to the table
filmeTable.setItems(mainApp.getfilmeDados());
}
}
For some reason it gives me a "java.lang.NullPointerException" while running the method showFilmeOverview(); here's the error:
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$154(LauncherImpl.java:182)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NullPointerException
at projeto.MainApp.showFilmeOverview(MainApp.java:49)
at projeto.MainApp.start(MainApp.java:40)
at com.sun.javafx.application.LauncherImpl.lambda$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 projeto.MainApp
I'm setting the controller in FilmeOverviewController controller = loader.getController();
and controller.setMainApp(this); why is it returning null?
