所以我有一个Javafx应用程序，它运行良好，但是当我在FXML控制器文件中添加新的控制器方法时，此错误不断出现！
Executing C:\Users\Mohsen\Documents\NetBeansProjects\TestPTFX2\dist\run1797453756\TestPTFX2.jar using platform C:\Program Files\Java\jdk1.8.0_45\jre/bin/java
Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1770)
at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1653)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Node.fireEvent(Node.java:8390)
at javafx.scene.control.Button.fire(Button.java:185)
at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:182)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:96)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:89)
at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Scene$MouseHandler.process(Scene.java:3758)
at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3486)
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2495)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:350)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:275)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$350(GlassViewEventHandler.java:385)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$$Lambda$201/1104469783.get(Unknown Source)
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:404)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:384)
at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
at com.sun.glass.ui.View.notifyMouse(View.java:927)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$145(WinApplication.java:101)
at com.sun.glass.ui.win.WinApplication$$Lambda$36/1963387170.run(Unknown Source)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1765)
... 50 more
Caused by: java.lang.NullPointerException
at FXMLDocumentController.AddClassButton(FXMLDocumentController.java:359)
... 60 more
这是我的FXML控制器文件：
import java.io.File;
import java.net.URL;
import java.time.DayOfWeek;
import java.util.ArrayList;
import java.util.ResourceBundle;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javafx.animation.TranslateTransition;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Button;
import javafx.scene.control.CheckBox;
import javafx.scene.control.ChoiceBox;
import javafx.scene.control.Label;
import javafx.scene.control.PasswordField;
import javafx.scene.control.TextField;
import javafx.scene.control.ToggleButton;
import javafx.scene.layout.AnchorPane;
import javafx.stage.FileChooser;
import javafx.stage.Stage;
import javafx.util.Duration;
public class FXMLDocumentController implements Initializable {
String AttachedFilePath;
int CourseAddPaneStatus = 0;
Member signedin = new Member();
FileManager FM = new FileManager();
ObservableList<String> genderList = FXCollections.observableArrayList("Gender","خانم","آقا");
ObservableList<String> gradeList = FXCollections.observableArrayList("Grade","ابتدایی","راهنمایی","دبیرستان","کاردانی","کارشناسی","کارشناسی ارشد","دکتری","تخصص");
// First Page
@FXML
AnchorPane firstPage;
// SignIn Page
@FXML
AnchorPane signInPage;
// SignUp Page
@FXML
AnchorPane signUpPage;
@FXML
TextField SignUpNameTextField;
@FXML
TextField SignUpPasswordTextField;
@FXML
TextField SignUpUserNameTextField;
@FXML
TextField SignUpEmailTextField;
@FXML
TextField SignUpCityTextField;
@FXML
TextField SignUpSchoolTextField;
@FXML
PasswordField SignUpPasswordField;
@FXML
ChoiceBox<String> SignUpGenderChoiceBox;
@FXML
ChoiceBox<String> SignUpGradeChoiceBox;
@FXML
Label SignUpInvalidEmailLabel;
@FXML
Label SignUpInvalidGenderLabel;
@FXML
Label SignUnInvalidUsernameLabel;
@FXML
Label SignUpInvalidGradeLabel;
@FXML
Label SignUpEmptyLabel;
@FXML
ToggleButton PasswordToggleButton;
@FXML
Label SignUpTakenEmailLabel;
// Course List
@FXML
AnchorPane CourseListPage;
@FXML
AnchorPane ClassAddPane;
@FXML
Button ClassListAddButton;
@FXML
CheckBox CourseAddShanbeChoiceBox;
@FXML
CheckBox CourseAddYekShanbeChoiceBox;
@FXML
CheckBox CourseAddDoShanbeChoiceBox;
@FXML
CheckBox CourseAddSeShanbeChoiceBox;
@FXML
CheckBox CourseAddCharShanbeChoiceBox;
@FXML
CheckBox CourseAddPanjShanbeChoiceBox;
@FXML
TextField CourseAddNameTextField;
@FXML
TextField CourseAddStartHourTextField;
@FXML
TextField CourseAddStartMinuteTextField;
@FXML
TextField CourseAddFinishHourTextField;
@FXML
TextField CourseAddFinishMinuteTextField;
@FXML
Button ClassAddFileButton;
@FXML
Button ClassAddButton;
@FXML
Label AddClassFillTextFieldsErrorLabel;
@FXML
Label AddClassNoDaysErrorLabel;
@FXML
Label AddClassWrongClockErrorLabel;
@FXML
Label AddClassAttachedFilePath;
@FXML
private void PasswordToggleButton (ActionEvent event) {
if(PasswordToggleButton.isSelected()) {
SignUpPasswordTextField.setText(SignUpPasswordField.getText());
SignUpPasswordField.setVisible(false);
SignUpPasswordTextField.setVisible(true);
} else {
SignUpPasswordField.setText(SignUpPasswordTextField.getText());
SignUpPasswordField.setVisible(true);
SignUpPasswordTextField.setVisible(false);
}
}
@FXML
private void FPSignInButton (ActionEvent event) {
firstPage.setVisible(false);
signInPage.setVisible(true);
}
@FXML
private void SignUpButton (ActionEvent event) {
int status = 0; // 8 = Complete // 0-7 = Not Complete!
if(SignUpNameTextField.getText().isEmpty() || SignUpUserNameTextField.getText().isEmpty() || SignUpEmailTextField.getText().isEmpty() || SignUpCityTextField.getText().isEmpty() || SignUpSchoolTextField.getText().isEmpty() || SignUpPasswordField.getText().isEmpty()) {
SignUpEmptyLabel.setVisible(true);
return;
} else {
SignUpEmptyLabel.setVisible(false);
}
Member newmember = new Member();
// Name
newmember.setName(SignUpNameTextField.getText());
status++;
// Username
int usernamestatus = 0;
for(Member m: FM.read()) {
if((m.getUsername().compareTo(SignUpUserNameTextField.getText())) == 0) {
usernamestatus++;
}
}
if(usernamestatus == 0) {
newmember.setUsername(SignUpUserNameTextField.getText());
status++;
SignUnInvalidUsernameLabel.setVisible(false);
} else {
SignUnInvalidUsernameLabel.setVisible(true);
}
// Email
String validEmail = "^[\\w\\.-]+@([\\w\\-]+\\.)+[A-Z]{2,8}$";
Pattern pattern = Pattern.compile(validEmail, Pattern.CASE_INSENSITIVE);
Matcher matcher = pattern.matcher(SignUpEmailTextField.getText());
if(!matcher.matches()) {
SignUpInvalidEmailLabel.setVisible(true);
} else {
int emailstatus = 0;
for(Member m: FM.read()) {
if((m.getEmail().compareTo(SignUpEmailTextField.getText())) == 0) {
emailstatus++;
}
}
if(emailstatus == 0) {
newmember.setEmail(SignUpEmailTextField.getText());
status++;
SignUpInvalidEmailLabel.setVisible(false);
SignUpTakenEmailLabel.setVisible(false);
} else {
SignUpTakenEmailLabel.setVisible(true);
}
}
// Grade
if(SignUpGradeChoiceBox.getValue().equals("Grade")) {
SignUpInvalidGradeLabel.setVisible(true);
} else {
newmember.setGrade(SignUpGradeChoiceBox.getValue());
SignUpInvalidGradeLabel.setVisible(false);
status++;
}
// Gender
if(SignUpGenderChoiceBox.getValue().equals("Gender")) {
SignUpInvalidGenderLabel.setVisible(true);
} else {
newmember.setGender(SignUpGenderChoiceBox.getValue());
SignUpInvalidGenderLabel.setVisible(false);
status++;
}
// City
newmember.setCity(SignUpCityTextField.getText());
status++;
// School
newmember.setSchool(SignUpSchoolTextField.getText());
status++;
// Password
if(PasswordToggleButton.isSelected()) {
newmember.setPassword(SignUpPasswordTextField.getText());
} else {
newmember.setPassword(SignUpPasswordField.getText());
}
status++;
if(status==8) {
ArrayList<Member> temp = new ArrayList<>();
temp = FM.read();
temp.add(newmember);
FM.write(temp);
signedin = newmember;
signUpPage.setVisible(false);
CourseListPage.setVisible(true);
}
}
@FXML
private void FPSignUpButton (ActionEvent event) {
firstPage.setVisible(false);
signUpPage.setVisible(true);
}
@FXML
private void ReturnToFirstPageButton (ActionEvent event) {
firstPage.setVisible(true);
signUpPage.setVisible(false);
signInPage.setVisible(false);
}
@FXML
private void ClassAddPaneButton (ActionEvent event) throws InterruptedException {
if(CourseAddPaneStatus == 0) {
CourseAddPaneStatus = 1;
ClassAddPane.setVisible(true);
TranslateTransition cominginbutton = new TranslateTransition();
cominginbutton.setDuration(Duration.millis(800));
cominginbutton.setByX(-408);
cominginbutton.setNode(ClassListAddButton);
TranslateTransition cominginpane = new TranslateTransition();
cominginpane.setDuration(Duration.millis(800));
cominginpane.setByX(-408);
cominginpane.setNode(ClassAddPane);
cominginbutton.play();
cominginpane.play();
} else {
CourseAddPaneStatus = 0;
TranslateTransition cominginbutton = new TranslateTransition();
cominginbutton.setDuration(Duration.millis(900));
cominginbutton.setByX(408);
cominginbutton.setNode(ClassListAddButton);
TranslateTransition cominginpane = new TranslateTransition();
cominginpane.setDuration(Duration.millis(900));
cominginpane.setByX(408);
cominginpane.setNode(ClassAddPane);
cominginbutton.play();
cominginpane.play();
}
}
@FXML
private void ExitButton (ActionEvent event) {
System.exit(0);
}
@FXML
private void AddClassButton (ActionEvent event) {
int status = 0;
if(CourseAddNameTextField.getText().isEmpty()
|| CourseAddStartHourTextField.getText().isEmpty()
|| CourseAddStartMinuteTextField.getText().isEmpty()
|| CourseAddFinishHourTextField.getText().isEmpty()
|| CourseAddFinishMinuteTextField.getText().isEmpty()) {
AddClassFillTextFieldsErrorLabel.setVisible(true);
status++;
} else {
AddClassFillTextFieldsErrorLabel.setVisible(false);
}
if(!CourseAddShanbeChoiceBox.isSelected()
&& !CourseAddYekShanbeChoiceBox.isSelected()
&& !CourseAddDoShanbeChoiceBox.isSelected()
&& !CourseAddSeShanbeChoiceBox.isSelected()
&& !CourseAddCharShanbeChoiceBox.isSelected()
&& !CourseAddPanjShanbeChoiceBox.isSelected()) {
AddClassNoDaysErrorLabel.setVisible(true);
status++;
} else {
AddClassNoDaysErrorLabel.setVisible(false);
}
if(!isNumber(CourseAddStartHourTextField.getText())
|| !isNumber(CourseAddStartMinuteTextField.getText())
|| !isNumber(CourseAddFinishHourTextField.getText())
|| !isNumber(CourseAddFinishMinuteTextField.getText())) {
AddClassWrongClockErrorLabel.setVisible(true);
status++;
} else {
if(Integer.parseInt(CourseAddStartHourTextField.getText())<0
|| Integer.parseInt(CourseAddStartHourTextField.getText())>23
|| Integer.parseInt(CourseAddFinishHourTextField.getText())<0
|| Integer.parseInt(CourseAddFinishHourTextField.getText())>23
|| Integer.parseInt(CourseAddStartMinuteTextField.getText())<0
|| Integer.parseInt(CourseAddStartMinuteTextField.getText())>59
|| Integer.parseInt(CourseAddFinishMinuteTextField.getText())<0
|| Integer.parseInt(CourseAddFinishMinuteTextField.getText())>59) {
AddClassWrongClockErrorLabel.setVisible(true);
status++;
} else {
AddClassWrongClockErrorLabel.setVisible(false);
}
}
if(status!=0) {
return;
}
Class newclass = new Class();
ArrayList<DayOfWeek> classdays = new ArrayList();
newclass.setSubject(CourseAddNameTextField.getText());
if(CourseAddShanbeChoiceBox.isSelected()) classdays.add(DayOfWeek.SATURDAY);
if(CourseAddYekShanbeChoiceBox.isSelected()) classdays.add(DayOfWeek.SUNDAY);
if(CourseAddDoShanbeChoiceBox.isSelected()) classdays.add(DayOfWeek.MONDAY);
if(CourseAddSeShanbeChoiceBox.isSelected()) classdays.add(DayOfWeek.TUESDAY);
if(CourseAddCharShanbeChoiceBox.isSelected()) classdays.add(DayOfWeek.WEDNESDAY);
if(CourseAddPanjShanbeChoiceBox.isSelected()) classdays.add(DayOfWeek.THURSDAY);
newclass.setDayofweek(classdays);
newclass.setStarttimehour(Integer.parseInt(CourseAddStartHourTextField.getText()));
newclass.setStarttimeminute(Integer.parseInt(CourseAddStartMinuteTextField.getText()));
newclass.setStarttimehour(Integer.parseInt(CourseAddStartHourTextField.getText()));
newclass.setStarttimeminute(Integer.parseInt(CourseAddStartMinuteTextField.getText()));
newclass.setAttachedfile(AttachedFilePath);
ArrayList<Class> ar = signedin.getClasses();
ar.add(newclass);
signedin.setClasses(ar);
for(Member m: FM.read()) {
if((m.getUsername().compareTo(signedin.getUsername())) == 0) {
int c = FM.read().indexOf(m);
ArrayList<Member> updatedarray = new ArrayList();
updatedarray.set(c, signedin);
FM.write(updatedarray);
}
}
}
@FXML
private void ChooseFileButton (ActionEvent event) {
FileChooser chooser = new FileChooser();
chooser.setTitle("Open File");
File file = chooser.showOpenDialog(new Stage());
AttachedFilePath = file.getPath();
}
@Override
public void initialize(URL url, ResourceBundle rb) {
SignUpGenderChoiceBox.setValue("Gender");
SignUpGradeChoiceBox.setValue("Grade");
SignUpGenderChoiceBox.setItems(genderList);
SignUpGradeChoiceBox.setItems(gradeList);
}
private boolean isNumber(String s) {
try {
Integer.parseInt(s);
return true;
} catch (NumberFormatException e){
return false;
}
}
}
在为按钮添加“ AddClassButton”处理程序之前未发生错误，该按钮应该获取有关类的信息并将其保存在成员的信息中
这些是您可能需要了解的可能的类：
会员：
import java.io.Serializable;
import java.util.ArrayList;
public class Member implements Serializable {
private final String RED = "\u001B[31m";
private final String RESET = "\u001B[0m";
private static final long serialVersionUID = 6529685098267757690L;
private String name;
private String username;
private String password;
private String gender;
private String grade;
private String city;
private String School;
private String email;
private ArrayList<Class> classes;
// Methods
public void addNewClass(Class a) {
this.classes.add(a);
}
// Getters
public ArrayList<Class> getClasses() {
return classes;
}
public String getName() {
return name;
}
public String getUsername() {
return username;
}
public String getPassword() {
return password;
}
public String getGrade() {
return grade;
}
public String getCity() {
return city;
}
public String getSchool() {
return School;
}
public String getGender() {
return gender;
}
public String getEmail() {
return email;
}
// Setters
public void setName(String name) {
this.name = name;
}
public void setUsername(String username) {
this.username = username;
}
public void setPassword(String password) {
this.password = password;
}
public void setGrade(String grade) {
this.grade = grade;
}
public void setCity(String city) {
this.city = city;
}
public void setSchool(String School) {
this.School = School;
}
public void setEmail(String email) {
this.email = email;
}
public void setGender(String gender) {
this.gender = gender;
}
public void setClasses(ArrayList<Class> classes) {
this.classes = classes;
}
}
班级：
import java.time.DayOfWeek;
import java.util.ArrayList;
public class Class {
private String subject;
private ArrayList<DayOfWeek> dayofweek;
private int starttimehour;
private int starttimeminute;
private int finishtimehour;
private int finishtimeminute;
private String note;
private String attachedfilepath;
// Getters
public int getStarttimehour() {
return starttimehour;
}
public int getStarttimeminute() {
return starttimeminute;
}
public int getFinishtimehour() {
return finishtimehour;
}
public int getFinishtimeminute() {
return finishtimeminute;
}
public String getSubject() {
return subject;
}
public ArrayList<DayOfWeek> getDuedate() {
return dayofweek;
}
public String getNote() {
return note;
}
public String getAttachedfile() {
return attachedfilepath;
}
// Setters
public void setSubject(String subject) {
this.subject = subject;
}
public void setDayofweek(ArrayList<DayOfWeek> dayofweek) {
this.dayofweek = dayofweek;
}
public void setStarttimehour(int starttimehour) {
this.starttimehour = starttimehour;
}
public void setStarttimeminute(int starttimeminute) {
this.starttimeminute = starttimeminute;
}
public void setFinishtimehour(int finishtimehour) {
this.finishtimehour = finishtimehour;
}
public void setFinishtimeminute(int finishtimeminute) {
this.finishtimeminute = finishtimeminute;
}
public void setNote(String note) {
this.note = note;
}
public void setAttachedfile(String attachedfile) {
this.attachedfilepath = attachedfile;
}
}
最后是FileManager：
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
public class FileManager {
private File file = new File("datastg.data3");
public FileManager() {
try {
if(!file.exists()) {
file.createNewFile();
ArrayList<Member> Base = new ArrayList();
Member j = new Member();
j.setCity("0");
j.setEmail("0");
j.setGender("0");
j.setName("0");
j.setPassword("0");
j.setSchool("0");
j.setUsername("0");
j.setGrade("0");
Base.add(j);
this.write(Base);
}
} catch(Exception e) {
e.printStackTrace();
}
}
public void write(ArrayList<Member> list) {
try {
FileOutputStream fos = new FileOutputStream(file);
ObjectOutputStream oos = new ObjectOutputStream(fos);
oos.writeObject(list);
oos.flush();
oos.close();
} catch(Exception e) {
e.printStackTrace();
}
}
public ArrayList<Member> read(){
try {
FileInputStream fis = new FileInputStream(file);
ObjectInputStream ois = new ObjectInputStream(fis);
ArrayList<Member> list = (ArrayList<Member>) ois.readObject();
ois.close();
return list;
} catch(IOException | ClassNotFoundException e) {
e.printStackTrace();
}
return null;
}
}