I'm trying to use setItems method of ListView but it gives me NullPointerException. Error seems to be triggered by the line 62 of the FXMLController.java. I read data from .xml file.
I've tried debugging, checking fxid, printing out the values of the arraylist and the observablelist and reading other people's posts.
ParcoAutonoleggioJavaFX.java (main)
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class ParcoAutonoleggioJavaFX extends Application {
@Override
public void start(Stage stage) throws Exception {
Parent root = FXMLLoader.load(getClass().getResource("FXML.fxml"));
Scene scene = new Scene(root);
stage.setScene(scene);
stage.show();
FXMLController fXMLController = new FXMLController();
fXMLController.aggiornaLista();
}
public static void main(String[] args) {
launch(args);
}
}
FXMLController.java
import java.io.IOException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
import java.util.ResourceBundle;
import javafx.beans.InvalidationListener;
import javafx.collections.FXCollections;
import javafx.collections.ListChangeListener;
import javafx.collections.ObservableList;
import javafx.fxml.Initializable;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
import javafx.scene.control.ListView;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class FXMLController implements Initializable {
@FXML
ListView list;
@Override
public void initialize(URL url, ResourceBundle rb) {
}
@FXML
public void aggiornaLista() throws ParserConfigurationException, SAXException, IOException {
File fXmlFile = new File("parcoAutonoleggio.xml");
DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
Document document = documentBuilder.parse(fXmlFile);
document.getDocumentElement().normalize();
NodeList nodeList = document.getElementsByTagName("auto");
ArrayList<String> arrayList = new ArrayList<>();
for (int i = 0; i < nodeList.getLength(); i++) {
Node node = nodeList.item(i);
Element element = (Element) node;
arrayList.add(element.getElementsByTagName("modello").item(0).getTextContent());
}
ObservableList<String> observableList = FXCollections.observableArrayList(arrayList);
list.setItems(observableList);
}
}
FXML.fxml
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.ListView?>
<?import javafx.scene.layout.AnchorPane?>
<AnchorPane id="AnchorPane" prefHeight="480.0" prefWidth="640.0" xmlns="http://javafx.com/javafx" xmlns:fx="http://javafx.com/fxml" fx:controller="parcoautonoleggiojavafx.FXMLController">
<children>
<ListView fx:id="list" layoutX="220.0" layoutY="140.0" prefHeight="200.0" prefWidth="200.0" />
</children>
</AnchorPane>
parcoAutonoleggio.xml
<parco>
<!-- -->
<auto>
<codice>1</codice>
<modello>fiat 600 1999</modello>
<noleggiato>true</noleggiato>
<giorniNoleggio>30</giorniNoleggio>
</auto>
<auto>
<codice>2</codice>
<modello>fiat 500 2012</modello>
<noleggiato>true</noleggiato>
<giorniNoleggio>180</giorniNoleggio>
</auto>
<auto>
<codice>3</codice>
<modello>ford raptor 2018</modello>
<noleggiato>true</noleggiato>
<giorniNoleggio>730</giorniNoleggio>
</auto>
<auto>
<codice>4</codice>
<modello>ford focus 2007</modello>
<noleggiato>true</noleggiato>
<giorniNoleggio>90</giorniNoleggio>
</auto>
<auto>
<codice>5</codice>
<modello>toyota aygo 2006</modello>
<noleggiato>false</noleggiato>
<giorniNoleggio>0</giorniNoleggio>
</auto>
<auto>
<codice>6</codice>
<modello>toyota lotus 2008</modello>
<noleggiato>false</noleggiato>
<giorniNoleggio>0</giorniNoleggio>
</auto>
<auto>
<codice>7</codice>
<modello>dodge viper 2003</modello>
<noleggiato>true</noleggiato>
<giorniNoleggio>60</giorniNoleggio>
</auto>
<auto>
<codice>8</codice>
<modello>mitsubishi lancer evo x</modello>
<noleggiato>false</noleggiato>
<giorniNoleggio>0</giorniNoleggio>
</auto>
</parco>
Stack trace
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$FXHelper.main(LauncherHelper.java:873)
Caused by: java.lang.RuntimeException: Exception in Application start method
at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$1(LauncherImpl.java:182)
at java.lang.Thread.run(Thread.java:748)
Caused by: javafx.fxml.LoadException:
/F:/TPS/JAVA%20XML/parcoAutonoleggioJavaFX/build/classes/parcoautonoleggiojavafx/FXML.fxml:8
at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2601)
at javafx.fxml.FXMLLoader.access$700(FXMLLoader.java:103)
at javafx.fxml.FXMLLoader$ValueElement.processAttribute(FXMLLoader.java:922)
at javafx.fxml.FXMLLoader$InstanceDeclarationElement.processAttribute(FXMLLoader.java:971)
at javafx.fxml.FXMLLoader$Element.processStartElement(FXMLLoader.java:220)
at javafx.fxml.FXMLLoader$ValueElement.processStartElement(FXMLLoader.java:744)
at javafx.fxml.FXMLLoader.processStartElement(FXMLLoader.java:2707)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2527)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2441)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3214)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3175)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3148)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3124)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3104)
at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3097)
at parcoautonoleggiojavafx.ParcoAutonoleggioJavaFX.start(ParcoAutonoleggioJavaFX.java:13)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$8(LauncherImpl.java:863)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$7(PlatformImpl.java:326)
at com.sun.javafx.application.PlatformImpl.lambda$null$5(PlatformImpl.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$6(PlatformImpl.java:294)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$4(WinApplication.java:185)
... 1 more
Caused by: java.lang.ClassNotFoundException: parcoautonoleggiojavafx.FXMLController
at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:355)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
at javafx.fxml.FXMLLoader$ValueElement.processAttribute(FXMLLoader.java:920)
... 22 more
Exception running application parcoautonoleggiojavafx.ParcoAutonoleggioJavaFX
C:\Users\rgrrlv02a31z154g\AppData\Local\NetBeans\Cache\8.2\executor-snippets\run.xml:53: Java returned: 1
BUILD FAILED (total time: 0 seconds)```