我试图制作一个登录或注册人的程序。但我一直得到相同的异常。（InvocationTargetException和NullPointerException）
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$$Lambda$48/1099983479.run(Unknown Source)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
at gui.StartSchermController.<init>(StartSchermController.java:76)
at StartUp.start(StartUp.java:27)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$153(LauncherImpl.java:821)
at com.sun.javafx.application.LauncherImpl$$Lambda$51/1727479380.run(Unknown Source)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$166(PlatformImpl.java:323)
at com.sun.javafx.application.PlatformImpl$$Lambda$45/128893786.run(Unknown Source)
at com.sun.javafx.application.PlatformImpl.lambda$null$164(PlatformImpl.java:292)
at com.sun.javafx.application.PlatformImpl$$Lambda$47/2063964656.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$165(PlatformImpl.java:291)
at com.sun.javafx.application.PlatformImpl$$Lambda$46/1108411398.run(Unknown Source)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$141(WinApplication.java:102)
at com.sun.glass.ui.win.WinApplication$$Lambda$37/1147985808.run(Unknown Source)
... 1 more
Exception running application StartUp
Java Result: 1
BUILD SUCCESSFUL (total time: 1 second)
我已经在这行代码中遇到了很多问题。
chTaal.setItems(FXCollections.observableArrayList(dc.keuzeTaal()));
在我的控制器中：
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package gui;
import domein.DomeinController;
import java.io.IOException;
import java.util.ArrayList;
import javafx.collections.FXCollections;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.control.Button;
import javafx.scene.control.ComboBox;
import javafx.scene.control.Label;
import javafx.scene.control.SplitPane;
import javafx.scene.control.TextField;
/**
* FXML Controller class
*
* @author Eigenaar
*/
public class StartSchermController extends SplitPane {
@FXML
private ComboBox chTaal;
@FXML
private TextField txfMeldID;
@FXML
private TextField txfMeldWw;
@FXML
private TextField txfRegNaam;
@FXML
private TextField txfRegVNaam;
@FXML
private TextField txfRegWw2;
@FXML
private TextField txfRegWw;
@FXML
private TextField txfRegID;
@FXML
private Label lblMeldAan;
@FXML
private Label lblRegistreer;
@FXML
private Label lblMeldId;
@FXML
private Label lblMeldWw;
@FXML
private Label lblRegNaam,lblRegVNaam,lblRegId,lblRegWw,lblRegWw2;
@FXML
private Button btnMeldAan,btnRegistreer;
private final DomeinController dc;
/**
* Initializes the controller class.
* @param dc
*/
public StartSchermController(DomeinController dc) {
this.dc=dc;
FXMLLoader loader=new FXMLLoader(getClass().getResource("StartScherm.fxml"));
loader.setRoot(this);
loader.setController(this);
try {
loader.load();
} catch (IOException ex) {
System.out.println(ex.getMessage());
}
chTaal.setItems(FXCollections.observableArrayList(dc.keuzeTaal()));
}
public int geefKeuze(){
int s = chTaal.getSelectionModel().getSelectedIndex();
return s;
}
@FXML
private void actionchbTaal(ActionEvent event) {
int keuzeTaal = chTaal.getSelectionModel().getSelectedIndex();
System.out.println(keuzeTaal);
updateTaal(dc.setTaal(keuzeTaal));
this.geefKeuze();
}
private void updateTaal(ArrayList<String> s) {
lblMeldAan.setText(s.get(0));
this.lblMeldId.setText(s.get(1));
this.lblMeldWw.setText(s.get(2));
this.lblRegistreer.setText(s.get(3));
this.lblRegNaam.setText(s.get(4));
this.lblRegVNaam.setText(s.get(5));
this.lblRegId.setText(s.get(6));
this.lblRegWw.setText(s.get(7));
this.lblRegWw2.setText(s.get(8));
}
@FXML
private void btnMeldAanOnAction(ActionEvent event){
String id= this.txfMeldID.getText();
String ww= this.txfMeldWw.getText();
dc.meldAan(id, ww);
}
@FXML
private void btnRegistreer(ActionEvent event){
String n=this.txfRegNaam.getText();
String vn=this.txfRegVNaam.getText();
String id= this.txfRegID.getText();
String ww= this.txfRegWw.getText();
String ww2=this.txfRegWw2.getText();
dc.maakSpelerAan(n, vn, id, ww);
}
}
这是我的fxml文件中由JavaFX Scene Builder 2.0生成的代码
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.text.*?>
<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<fx:root dividerPositions="0.17839195979899497" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" orientation="VERTICAL" prefHeight="400.0" prefWidth="600.0" type="SplitPane" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1">
<items>
<AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="100.0" prefWidth="160.0">
<children>
<ComboBox fx:id="chTaal" layoutX="43.0" layoutY="18.0" onAction="#actionchbTaal" prefWidth="150.0" />
<Label layoutX="352.0" text="SOKOBAN" textFill="#d7300f">
<font>
<Font name="Colonna MT" size="48.0" />
</font>
</Label>
</children></AnchorPane>
<AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="257.0" prefWidth="598.0">
<children>
<SplitPane dividerPositions="0.481421647819063" layoutY="-8.0" prefHeight="400.0" prefWidth="621.0">
<items>
<AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="346.0" prefWidth="295.0">
<children>
<Label fx:id="lblMeldAan" layoutX="12.0" layoutY="1.0" prefHeight="27.0" prefWidth="106.0">
<font>
<Font size="18.0" />
</font>
</Label>
<Label fx:id="lblMeldId" layoutX="14.0" layoutY="42.0" prefHeight="17.0" prefWidth="74.0" />
<TextField fx:id="txfMeldID" layoutX="97.0" layoutY="38.0" />
<Label fx:id="lblMeldWw" layoutX="14.0" layoutY="83.0" prefHeight="17.0" prefWidth="74.0" />
<TextField fx:id="txfMeldWw" layoutX="97.0" layoutY="79.0" />
<TextField layoutX="30.0" layoutY="165.0" prefHeight="116.0" prefWidth="244.0" />
<Button fx:id="btnMeldAan" layoutX="97.0" layoutY="129.0" mnemonicParsing="false" onAction="#btnMeldAanOnAction" text="Meld aan" />
</children>
</AnchorPane>
<AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="160.0" prefWidth="100.0">
<children>
<Label fx:id="lblRegistreer" layoutX="14.0" layoutY="1.0" prefHeight="27.0" prefWidth="106.0">
<font>
<Font size="18.0" />
</font>
</Label>
<Label fx:id="lblRegNaam" layoutX="8.0" layoutY="41.0" prefHeight="17.0" prefWidth="113.0" text="" />
<Label fx:id="lblRegWw" layoutX="8.0" layoutY="148.0" prefHeight="17.0" prefWidth="113.0" text="" />
<Label fx:id="lblRegId" layoutX="8.0" layoutY="112.0" prefHeight="17.0" prefWidth="113.0" text="" />
<Label fx:id="lblRegVNaam" layoutX="8.0" layoutY="76.0" prefHeight="17.0" prefWidth="113.0" text="" />
<Label fx:id="lblRegWw2" layoutX="8.0" layoutY="185.0" text="" />
<TextField fx:id="txfRegNaam" layoutX="128.0" layoutY="37.0" />
<TextField fx:id="txfRegVNaam" layoutX="128.0" layoutY="72.0" />
<TextField fx:id="txfRegWw2" layoutX="128.0" layoutY="181.0" />
<TextField fx:id="txfRegWw" layoutX="128.0" layoutY="144.0" />
<TextField fx:id="txfRegID" layoutX="128.0" layoutY="108.0" />
<Button fx:id="btnRegistreer" layoutX="128.0" layoutY="226.0" mnemonicParsing="false" onAction="#btnRegistreerOnAction" text="Registreer" />
</children>
</AnchorPane>
</items>
</SplitPane>
</children></AnchorPane>
</items>
</fx:root>
这就是domeinController：
package domein;
import java.util.ArrayList;
import java.util.Locale;
import java.util.ResourceBundle;
public class DomeinController {
private final SpelerRepository spelerRepository;
private Speler speler;
// private Spel spel;
public DomeinController() {
spelerRepository = new SpelerRepository();
}
/*
public void registreer(String naam, String voornaam, String email, LocalDate geboortedatum, String wachtwoord, String wachtwoordBevestiging) {
if (!wachtwoord.equals(wachtwoordBevestiging)) {
throw new EmailException();
}*/
/*
Speler nieuweSpeler = new Speler(naam, voornaam, gebruikersID, wachtwoord);
setSpeler(nieuweSpeler); // ONTBREEKT!!
spelerRepository.voegToe(nieuweSpeler);
}*/
/** UC_1 meldAan DOING */
public void meldAan(String gebruikersID, String wachtwoord) {
Speler gevondenSpeler = spelerRepository.meldAan(gebruikersID, wachtwoord);
if (gevondenSpeler != null) {
setSpeler(gevondenSpeler);
}
}
/** UC_1 meldAan KNOWING */
public String[] geefDetailsSpeler() {
return speler.geefDetailsSpeler();
/* if (speler == null) {
return null;
}
String[] spelerS = new String[3];
spelerS[0] = speler.getVoornaam();
spelerS[1] = speler.getNaam();
return spelerS;*/
}
private void setSpeler(Speler speler){
this.speler = speler;
}
public void maakSpelerAan(String naam, String voornaam, String gebruikersID, String wachtwoord) {
Speler s=new Speler(naam,voornaam,gebruikersID,wachtwoord,false);
spelerRepository.voegToe(s);
}
public ArrayList<String> keuzeTaal(){
ArrayList<String> taal = new ArrayList<>();
taal.add("Nederlands");
taal.add("Français");
taal.add("English");
return taal;
}
public ArrayList<String> setTaal(int i){
ResourceBundle taal=setResourceBundle(i);
ArrayList<String> s= new ArrayList<>();
s.add(taal.getString("meldAan"));
s.add(taal.getString("userID"));
s.add(taal.getString("wachtwoord"));
s.add(taal.getString("registreer"));
s.add(taal.getString("naam"));
s.add(taal.getString("voornaam"));
s.add(taal.getString("userID"));
s.add(taal.getString("wachtwoord"));
s.add(taal.getString("herhalingWachtwoord"));
return s;
}
public static ResourceBundle setResourceBundle(int taalKeuze) {
Locale locale=null;
ResourceBundle taal;
if (taalKeuze==1) {
locale = Locale.FRENCH;
} else if (taalKeuze==2) {
locale = Locale.ENGLISH;
} else if(taalKeuze==0) {
locale = new Locale("nl");
}
return ResourceBundle.getBundle("taal\\LabelsBundle", locale);
}
;
}
/*
private void setSpel(Spel spel) {
this.spel = spel;
}
*/
这是startUp：
import domein.DomeinController;
import gui.StartSchermController;
import javafx.application.Application;
import static javafx.application.Application.launch;
import javafx.scene.Scene;
import javafx.stage.Stage;
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
/**
*
* @author Eigenaar
*/
@SuppressWarnings("unchecked")
public class StartUp extends Application
{
@Override
@SuppressWarnings("unchecked")
public void start(Stage stage)
{
DomeinController controller = new DomeinController();
StartSchermController root = new StartSchermController(controller);
Scene scene = new Scene(root);
stage.setScene(scene);
stage.setTitle("Startscherm Sokoban");
stage.show();
}
public static void main(String[] args)
{
launch(args);
}
}
提前谢谢你。我希望有人可以帮助我。 （抱歉我的英语不好）