java - fxml controller

Excepción de carga de JavaFX

Question

Intento hacer una aplicación de calculadora básica con JavaFX, pero tengo problemas para iniciar la aplicación.

Este es el error que obtengo

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:483)
at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:363)
at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:303)
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:483)
at sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767)
Caused by: java.lang.RuntimeException: Exception in Application start method
at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:875)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$147(LauncherImpl.java:157)
at com.sun.javafx.application.LauncherImpl$$Lambda$48/815033865.run(Unknown Source)
at java.lang.Thread.run(Thread.java:745)
Caused by: javafx.fxml.LoadException:
/path/.../view/CalculatorScreen.fxml:10
at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2595)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2573)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2435)
at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2403)
at calculator.Calculator.start(Calculator.java:27)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$153(LauncherImpl.java:821)
at com.sun.javafx.application.LauncherImpl$$Lambda$51/1284973402.run(Unknown Source)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$166(PlatformImpl.java:323)
at com.sun.javafx.application.PlatformImpl$$Lambda$44/584634336.run(Unknown Source)
at com.sun.javafx.application.PlatformImpl.lambda$null$164(PlatformImpl.java:292)
at com.sun.javafx.application.PlatformImpl$$Lambda$47/1127003017.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$165(PlatformImpl.java:291)
at com.sun.javafx.application.PlatformImpl$$Lambda$46/501263526.run(Unknown Source)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$141(WinApplication.java:102)
at com.sun.glass.ui.win.WinApplication$$Lambda$37/96639997.run(Unknown Source)
... 1 more
Caused by: java.lang.IllegalArgumentException: Can not set java.awt.Button field controller.CalculatorScreenController.zeroButton to javafx.scene.control.Button
at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:167)
at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:171)
at sun.reflect.UnsafeObjectFieldAccessorImpl.set(UnsafeObjectFieldAccessorImpl.java:81)
at java.lang.reflect.Field.set(Field.java:758)
at javafx.fxml.FXMLLoader.injectFields(FXMLLoader.java:1155)
at javafx.fxml.FXMLLoader.access$1600(FXMLLoader.java:104)
at javafx.fxml.FXMLLoader$ValueElement.processValue(FXMLLoader.java:853)
at javafx.fxml.FXMLLoader$ValueElement.processStartElement(FXMLLoader.java:747)
at javafx.fxml.FXMLLoader.processStartElement(FXMLLoader.java:2701)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2521)
... 17 more
Exception running application calculator.Calculator

Así es como están configurados mis paquetes.

calculator
Calculator.java
controller
CalculatorScreenController.java
view
CalculatorScreen.fxml

Mi Calculadora.java

package calculator;
import controller.CalculatorScreenController;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class Calculator extends Application {
@Override
public void start(Stage stage) throws Exception
{
FXMLLoader fxmlLoader = new FXMLLoader( getClass().getResource( "/view/CalculatorScreen.fxml" ));
Parent root = fxmlLoader.load();
CalculatorScreenController controller = (CalculatorScreenController) fxmlLoader.getController();
Scene scene = new Scene(root);
stage.setScene(scene);
stage.show();
}
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
launch(args);
}
}

Mi CalculatorScreenController.java

package controller;
import calculator.Calculator;
import java.awt.Button;
import java.awt.Label;
import java.net.URL;
import java.util.ResourceBundle;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
public class CalculatorScreenController implements Initializable{
@FXML
private Button oneButton;
@FXML
private Button twoButton;
@FXML
private Button threeButton;
@FXML
private Button fourButton;
@FXML
private Button fiveButton;
@FXML
private Button sixButton;
@FXML
private Button sevenButton;
@FXML
private Button eightButton;
@FXML
private Button nineButton;
@FXML
private Button zeroButton;
@FXML
private Button dotButton;
@FXML
private Button plusButton;
@FXML
private Button minusButton;
@FXML
private Button multiplyButton;
@FXML
private Button divideButton;
@FXML
private Button equalsButton;
@FXML
private Button clearButton;
@FXML
private Label displayLabel;
@Override
public void initialize(URL url, ResourceBundle rb) {
displayLabel.setText("500");
}
}

Sé que aún no tengo muchos códigos escritos, por el momento solo intento descubrir cómo ejecutar la aplicación. Soy nuevo en todo esto, así que cualquier ayuda sería apreciada, ¡gracias!

Answer 1

Tiene las importaciones incorrectas en su controlador. java.awt.Button y java.awt.Label deben ser javafx.scene.control.Button y javafx.scene.control.Label

Answer 2

reemplace esta ruta de archivo fxml

"/view/CalculatorScreen.fxml"

con este-

"../view/CalculatorScreen.fxml"