因此，我试图从ObjectStream加载数据，这是我在“ Load_CLient_Data_From_File（）”方法中所做的，程序获得了3种添加客户端的功能，然后将其存储并显示在TableView中，但似乎崩溃了，告诉我有一个NULLPOINTEREXCEPTION。 公司类是一个独立的类，它将包含所有方法以及对客户数据进行的所有操作。
我尝试添加Button将数据加载到ObservableList“ ClientList”中，然后当我单击Display Button时崩溃了
我得到的堆栈：
Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at com.sun.javafx.property.PropertyReference.get(PropertyReference.java:177)
at javafx.scene.control.cell.PropertyValueFactory.getCellDataReflectively(PropertyValueFactory.java:147)
at javafx.scene.control.cell.PropertyValueFactory.call(PropertyValueFactory.java:119)
at javafx.scene.control.cell.PropertyValueFactory.call(PropertyValueFactory.java:98)
at javafx.scene.control.TableColumn.getCellObservableValue(TableColumn.java:578)
at javafx.scene.control.TableColumn.getCellObservableValue(TableColumn.java:563)
at javafx.scene.control.TableCell.updateItem(TableCell.java:644)
at javafx.scene.control.TableCell.indexChanged(TableCell.java:468)
at javafx.scene.control.IndexedCell.updateIndex(IndexedCell.java:116)
at com.sun.javafx.scene.control.skin.TableViewSkin.resizeColumnToFitContent(TableViewSkin.java:241)
at com.sun.javafx.scene.control.skin.TableViewSkin.resizeColumnToFitContent(TableViewSkin.java:54)
at com.sun.javafx.scene.control.skin.TableColumnHeader.doColumnAutoSize(TableColumnHeader.java:531)
at com.sun.javafx.scene.control.skin.TableColumnHeader.updateScene(TableColumnHeader.java:474)
at com.sun.javafx.scene.control.skin.TableColumnHeader.handlePropertyChanged(TableColumnHeader.java:314)
at com.sun.javafx.scene.control.skin.TableColumnHeader.lambda$new$89(TableColumnHeader.java:149)
at com.sun.javafx.scene.control.MultiplePropertyChangeListenerHandler$1.changed(MultiplePropertyChangeListenerHandler.java:55)
at javafx.beans.value.WeakChangeListener.changed(WeakChangeListener.java:89)
at com.sun.javafx.binding.ExpressionHelper$SingleChange.fireValueChangedEvent(ExpressionHelper.java:182)
at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:81)
at javafx.beans.property.ReadOnlyObjectPropertyBase.fireValueChangedEvent(ReadOnlyObjectPropertyBase.java:74)
at javafx.beans.property.ReadOnlyObjectWrapper.fireValueChangedEvent(ReadOnlyObjectWrapper.java:102)
at javafx.scene.Node$ReadOnlyObjectWrapperManualFire.fireSuperValueChangedEvent(Node.java:831)
at javafx.scene.Node.invalidatedScenes(Node.java:881)
at javafx.scene.Node.setScenes(Node.java:919)
at javafx.scene.Parent$1.onChanged(Parent.java:269)
at com.sun.javafx.collections.TrackableObservableList.lambda$new$68(TrackableObservableList.java:45)
at com.sun.javafx.collections.ListListenerHelper$Generic.fireValueChangedEvent(ListListenerHelper.java:329)
at com.sun.javafx.collections.ListListenerHelper.fireValueChangedEvent(ListListenerHelper.java:73)
at javafx.collections.ObservableListBase.fireChange(ObservableListBase.java:233)
at javafx.collections.ListChangeBuilder.commit(ListChangeBuilder.java:482)
at javafx.collections.ListChangeBuilder.endChange(ListChangeBuilder.java:541)
at javafx.collections.ObservableListBase.endChange(ObservableListBase.java:205)
at javafx.collections.ModifiableObservableListBase.setAll(ModifiableObservableListBase.java:90)
at com.sun.javafx.collections.VetoableListDecorator.setAll(VetoableListDecorator.java:116)
at com.sun.javafx.scene.control.skin.NestedTableColumnHeader.updateContent(NestedTableColumnHeader.java:487)
at com.sun.javafx.scene.control.skin.NestedTableColumnHeader.updateTableColumnHeaders(NestedTableColumnHeader.java:317)
at com.sun.javafx.scene.control.skin.NestedTableColumnHeader.checkState(NestedTableColumnHeader.java:544)
at com.sun.javafx.scene.control.skin.NestedTableColumnHeader.computePrefHeight(NestedTableColumnHeader.java:427)
at javafx.scene.Parent.prefHeight(Parent.java:929)
at javafx.scene.layout.Region.prefHeight(Region.java:1435)
at com.sun.javafx.scene.control.skin.TableHeaderRow.computePrefHeight(TableHeaderRow.java:331)
at com.sun.javafx.scene.control.skin.TableHeaderRow.computeMinHeight(TableHeaderRow.java:324)
at javafx.scene.Parent.minHeight(Parent.java:957)
at javafx.scene.layout.Region.minHeight(Region.java:1401)
at javafx.scene.control.SkinBase.computeMinHeight(SkinBase.java:254)
at javafx.scene.control.Control.computeMinHeight(Control.java:489)
at javafx.scene.Parent.minHeight(Parent.java:957)
at javafx.scene.layout.Region.minHeight(Region.java:1401)
at javafx.scene.layout.Region.computeChildPrefAreaHeight(Region.java:1762)
at javafx.scene.layout.AnchorPane.computeHeight(AnchorPane.java:297)
at javafx.scene.layout.AnchorPane.computeMinHeight(AnchorPane.java:246)
at javafx.scene.Parent.minHeight(Parent.java:963)
at javafx.scene.layout.Region.minHeight(Region.java:1401)
at javafx.scene.control.DialogPane.computeMinHeight(DialogPane.java:952)
at javafx.scene.Parent.minHeight(Parent.java:963)
at javafx.scene.layout.Region.minHeight(Region.java:1401)
at javafx.scene.control.DialogPane.layoutChildren(DialogPane.java:826)
at javafx.scene.Parent.layout(Parent.java:1087)
at javafx.scene.control.HeavyweightDialog.positionStage(HeavyweightDialog.java:279)
at javafx.scene.control.HeavyweightDialog.access$000(HeavyweightDialog.java:44)
at javafx.scene.control.HeavyweightDialog$1.centerOnScreen(HeavyweightDialog.java:56)
at javafx.scene.control.HeavyweightDialog.showAndWait(HeavyweightDialog.java:161)
at javafx.scene.control.Dialog.showAndWait(Dialog.java:341)
at sample.Controller.Handle_Display_Dialog(Controller.java:61)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1771)
at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Scene$ClickGenerator.postProcess(Scene.java:3470)
at javafx.scene.Scene$ClickGenerator.access$8100(Scene.java:3398)
at javafx.scene.Scene$MouseHandler.process(Scene.java:3766)
at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485)
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:394)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$345(GlassViewEventHandler.java:432)
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:431)
at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
at com.sun.glass.ui.View.notifyMouse(View.java:937)
at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
at com.sun.glass.ui.gtk.GtkApplication.lambda$null$203(GtkApplication.java:139)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
at com.sun.javafx.property.PropertyReference.get(PropertyReference.java:175)
... 104 more
Caused by: java.lang.NullPointerException
at sample.Client.getFullName(Client.java:24)
... 114 more
Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1774)
at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Scene$ClickGenerator.postProcess(Scene.java:3470)
at javafx.scene.Scene$ClickGenerator.access$8100(Scene.java:3398)
at javafx.scene.Scene$MouseHandler.process(Scene.java:3766)
at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485)
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:394)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$345(GlassViewEventHandler.java:432)
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:431)
at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
at com.sun.glass.ui.View.notifyMouse(View.java:937)
at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
at com.sun.glass.ui.gtk.GtkApplication.lambda$null$203(GtkApplication.java:139)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1771)
... 31 more
Caused by: java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at com.sun.javafx.property.PropertyReference.get(PropertyReference.java:177)
at javafx.scene.control.cell.PropertyValueFactory.getCellDataReflectively(PropertyValueFactory.java:147)
at javafx.scene.control.cell.PropertyValueFactory.call(PropertyValueFactory.java:119)
at javafx.scene.control.cell.PropertyValueFactory.call(PropertyValueFactory.java:98)
at javafx.scene.control.TableColumn.getCellObservableValue(TableColumn.java:578)
at javafx.scene.control.TableColumn.getCellObservableValue(TableColumn.java:563)
at javafx.scene.control.TableCell.updateItem(TableCell.java:644)
at javafx.scene.control.TableCell.indexChanged(TableCell.java:468)
at javafx.scene.control.IndexedCell.updateIndex(IndexedCell.java:116)
at com.sun.javafx.scene.control.skin.TableRowSkinBase.updateCells(TableRowSkinBase.java:533)
at com.sun.javafx.scene.control.skin.TableRowSkinBase.init(TableRowSkinBase.java:147)
at com.sun.javafx.scene.control.skin.TableRowSkin.<init>(TableRowSkin.java:64)
at javafx.scene.control.TableRow.createDefaultSkin(TableRow.java:212)
at javafx.scene.control.Control.impl_processCSS(Control.java:872)
at javafx.scene.Node.processCSS(Node.java:9056)
at javafx.scene.Node.applyCss(Node.java:9153)
at com.sun.javafx.scene.control.skin.VirtualFlow.setCellIndex(VirtualFlow.java:1964)
at com.sun.javafx.scene.control.skin.VirtualFlow.getCell(VirtualFlow.java:1797)
at com.sun.javafx.scene.control.skin.VirtualFlow.getCellLength(VirtualFlow.java:1879)
at com.sun.javafx.scene.control.skin.VirtualFlow.computeViewportOffset(VirtualFlow.java:2528)
at com.sun.javafx.scene.control.skin.VirtualFlow.layoutChildren(VirtualFlow.java:1189)
at javafx.scene.Parent.layout(Parent.java:1087)
at javafx.scene.Parent.layout(Parent.java:1093)
at javafx.scene.Parent.layout(Parent.java:1093)
at javafx.scene.Parent.layout(Parent.java:1093)
at javafx.scene.control.HeavyweightDialog.positionStage(HeavyweightDialog.java:279)
at javafx.scene.control.HeavyweightDialog.access$000(HeavyweightDialog.java:44)
at javafx.scene.control.HeavyweightDialog$1.centerOnScreen(HeavyweightDialog.java:56)
at javafx.scene.control.HeavyweightDialog.showAndWait(HeavyweightDialog.java:161)
at javafx.scene.control.Dialog.showAndWait(Dialog.java:341)
at sample.Controller.Handle_Display_Dialog(Controller.java:61)
... 41 more
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:498)
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:498)
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
at com.sun.javafx.property.PropertyReference.get(PropertyReference.java:175)
... 71 more
Caused by: java.lang.NullPointerException
at sample.Client.getFullName(Client.java:24)
... 81 more
公司类别： 包装样品；
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import java.io.*;
public class Company implements Serializable{
private static final long serialVersionUID = 1L;
private static Company Instance = new Company();
public static Company getInstance() {
return Instance;
}
private ObservableList<Client>ClientList;
private Company() {
}
private Client Check_if_Client_Exist(String ClientPhoneNUmber){
Client TempClient = null;
for(Client Client :ClientList){
if(Client.getPhoneNumber().equalsIgnoreCase(ClientPhoneNUmber))
TempClient = Client;
}
return TempClient;
}
public boolean Add_New_Client_To_The_List(Client Client) throws IOException{
if(Check_if_Client_Exist(Client.getPhoneNumber())==null){
ClientList.add(Client);
return true;
}
return false;
}
public void Store_Client_In_File () throws IOException {
try(ObjectOutputStream ClientFile = new ObjectOutputStream(new BufferedOutputStream(new FileOutputStream("Client.dat")))){
for(Client TempClient : ClientList){
ClientFile.writeObject(TempClient);
}
}
}
public void Load_CLient_Data_From_File() throws IOException,ClassNotFoundException,NullPointerException{
boolean EndOfFile = false;
ClientList = FXCollections.observableArrayList();
try(ObjectInputStream ClientFile = new ObjectInputStream(new BufferedInputStream(new FileInputStream("Client.dat")))){
while(!EndOfFile){
try{
Client Client = (Client)ClientFile.readObject();
ClientList.add(Client);
}catch(EOFException E){
EndOfFile=true;
}
}
}
}
public ObservableList<Client> getClientList() {
return ClientList;
}
}
客户端类
package sample;
import javafx.beans.property.SimpleStringProperty;
import java.io.*;
public class Client implements Serializable{
private static final Long serialVersionUID = 1L;
private transient SimpleStringProperty FullName = new SimpleStringProperty("");
private transient SimpleStringProperty PhoneNumber = new SimpleStringProperty("");
public Client(){
}
public Client(String fullName, String phoneNumber) {
FullName.set(fullName);
PhoneNumber.set(phoneNumber);
}
public String getFullName() {
return FullName.get();
}
public SimpleStringProperty fullNameProperty() {
return FullName;
}
public void setFullName(String fullName) {
this.FullName.set(fullName);
}
public String getPhoneNumber() {
return PhoneNumber.get();
}
public SimpleStringProperty phoneNumberProperty() {
return PhoneNumber;
}
public void setPhoneNumber(String phoneNumber) {
this.PhoneNumber.set(phoneNumber);
}
}
用于DisplayAllClients的FXML文件
<?xml version="1.0" encoding="UTF-8"?>
<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.control.cell.PropertyValueFactory?>
<AnchorPane xmlns="http://javafx.com/javafx"
xmlns:fx="http://javafx.com/fxml"
fx:controller="sample.DisplayAllClients"
prefHeight="400.0" prefWidth="600.0">
<TableView fx:id="ClientsTable" prefWidth="500" prefHeight="300">
<columnResizePolicy>
<TableView fx:constant="CONSTRAINED_RESIZE_POLICY"/>
</columnResizePolicy>
<columns>
<TableColumn text="Client Full Name">
<cellValueFactory>
<PropertyValueFactory property="FullName" />
</cellValueFactory>
</TableColumn>
<TableColumn text="Client Phone Number">
<cellValueFactory>
<PropertyValueFactory property="phoneNumber" />
</cellValueFactory>
</TableColumn>
</columns>
</TableView>
</AnchorPane>
我期望数据将在“表格视图”中正常显示，但似乎可以打印出我之前提到的堆栈