テキストフィールドに表示される項目を取得できません

Question

テーブルビュー内の行を選択すると自動的にそれが新しいデータの追加セクションにあるテキストフィールドボックスに表示されるようなコードで作業しようとしています。私はfxmlをセットアップして、それをシーンビルダーとやりとりします。

私はこの問題がこのコード行であることをかなり確信しています。 userNameBoxはnullになります。

userNameBox.setText(staff.getuserName()); 

コントローラコード

public class StaffController implements Initializable { 

    Connection conn; 
    ResultSet rs; 
    @FXML 
    private Label label; 
    @FXML 
    private TableView<Retailer> tableUser; 
    @FXML 
    private TableColumn<Retailer, String> columnuserName; 
    @FXML 
    private TableColumn<Retailer, String> columnfirstName; 
    @FXML 
    private TableColumn<Retailer, String> columnlastName; 
    @FXML 
    private TableColumn<Retailer, String> columnuserEmail; 
    @FXML 
    private TableColumn<Retailer, Integer> columnSalary; 
    @FXML 
    private Button btnLoad; 
    @FXML 
    private Button addButton; 
    @FXML 
    private TextField userNameBox; 
    @FXML 
    private TextField firstNameBox; 
    @FXML 
    private TextField lastNameBox; 
    @FXML 
    private TextField emailBox; 
    @FXML 
    private TextField salaryBox; 
    // Initialize observable list to hold out database data 
    private ObservableList<Retailer> data; 
    private Database dc; 

    private PreparedStatement query; 
    Connection c; 

    @Override 
    public void initialize(URL url, ResourceBundle rb) { 
     // TODO 
     dc = new Database(); 



    } 

    @FXML 
      public void showOnClick(){ 

       dc = new Database(); 
       c = dc.Connect(); 



       try{ 

        Retailer staff=(Retailer)tableUser.getSelectionModel().getSelectedItem(); 
        String querySelect="SELECT * from Staff"; 
        System.out.println(querySelect); 
        System.out.println(query); 
        System.out.println(c); 
        System.out.println(staff); 
        query=c.prepareStatement(querySelect); 

        userNameBox.setText(staff.getuserName()); 
        firstNameBox.setText(staff.getfirstName()); 
        lastNameBox.setText(staff.getlastName()); 
        emailBox.setText(staff.getuserEmail()); 
        salaryBox.setText(Integer.toString(staff.getSalary())); 

       query.close(); 
       rs.close(); 

       } 
       catch(SQLException e){ 

        System.out.println("SQL wrong"); 
       } 


      } 

FXMLコード

<AnchorPane id="AnchorPane" prefHeight="500.0" prefWidth="616.0" xmlns="http://javafx.com/javafx/8.0.111" xmlns:fx="http://javafx.com/fxml/1" fx:controller="application.StaffController"> 
    <children> 
     <Label fx:id="label" layoutX="126" layoutY="120" minHeight="16" minWidth="69" /> 
     <TableView fx:id="tableUser" layoutX="223.0" layoutY="74.0" onMouseClicked="#showOnClick" prefHeight="248.0" prefWidth="379.0"> 
     <columns> 
      <TableColumn fx:id="columnuserName" prefWidth="75.0" text="User Name" /> 
      <TableColumn fx:id="columnfirstName" prefWidth="75.0" text="First Name" /> 
      <TableColumn fx:id="columnlastName" prefWidth="75.0" text="Last Name" /> 
      <TableColumn fx:id="columnuserEmail" prefWidth="90.0" text="Email" /> 
      <TableColumn fx:id="columnSalary" prefWidth="75.0" text="Salary" /> 
     </columns> 
     </TableView> 
     <Label layoutX="239.0" layoutY="31.0" prefHeight="27.0" prefWidth="138.0" text="Staff"> 
     <font> 
      <Font size="18.0" /> 
     </font> 
     </Label> 
     <Button fx:id="btnLoad" layoutX="442.0" layoutY="347.0" mnemonicParsing="false" onAction="#loadDataFromDatabase" prefHeight="25.0" prefWidth="145.0" text="LOAD DETAILS" /> 
     <TextField id="userNameBox" layoutX="73.0" layoutY="95.0" prefHeight="25.0" prefWidth="112.0" promptText="User Name" /> 
     <TextField id="firstNameBox" layoutX="73.0" layoutY="137.0" prefHeight="25.0" prefWidth="112.0" promptText="First Name" /> 
     <TextField id="lastNameBox" layoutX="73.0" layoutY="179.0" prefHeight="25.0" prefWidth="112.0" promptText="Last Name" /> 
     <TextField id="emailBox" layoutX="70.0" layoutY="225.0" prefHeight="25.0" prefWidth="112.0" promptText="Email" /> 
     <TextField id="salaryBox" layoutX="73.0" layoutY="276.0" prefHeight="25.0" prefWidth="112.0" promptText="Salary" /> 
     <Button id="addButton" layoutX="161.0" layoutY="310.0" mnemonicParsing="false" onAction="#AddStaff" text="Add" /> 
     <Label layoutX="106.0" layoutY="58.0" text="Add new User" /> 
     <Label layoutX="14.0" layoutY="99.0" text="User Name" /> 
     <Label layoutX="14.0" layoutY="141.0" text="First Name" /> 
     <Label layoutX="14.0" layoutY="183.0" text="Last Name" /> 
     <Label layoutX="14.0" layoutY="229.0" text="Email" /> 
     <Label layoutX="14.0" layoutY="280.0" text="Salary" /> 
     <Circle id="deleteButton" fill="RED" layoutX="208.0" layoutY="116.0" radius="12.0" stroke="BLACK" strokeType="INSIDE" /> 
     <Rectangle id="deleteButton" arcHeight="5.0" arcWidth="5.0" fill="#f5f5f5" height="8.0" layoutX="202.0" layoutY="112.0" stroke="BLACK" strokeType="INSIDE" width="13.0" /> 
    </children> 
</AnchorPane> 

エラーコード

Apr 30, 2017 6:52:55 PM javafx.fxml.FXMLLoader$ValueElement processValue 
WARNING: Loading FXML document with JavaFX API of version 8.0.111 by JavaFX runtime of version 8.0.101 
Sun Apr 30 18:53:04 BST 2017 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification. 
Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException 
    at javafx.fxml.FXMLLoader$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$MouseEventNotification.run(GlassViewEventHandler.java:380) 
    at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:294) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$354(GlassViewEventHandler.java:416) 
    at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389) 
    at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:415) 
    at com.sun.glass.ui.View.handleMouseEvent(View.java:555) 
    at com.sun.glass.ui.View.notifyMouse(View.java:937) 
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method) 
    at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191) 
    at java.lang.Thread.run(Unknown Source) 
Caused by: java.lang.reflect.InvocationTargetException 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 
    at java.lang.reflect.Method.invoke(Unknown Source) 
    at sun.reflect.misc.Trampoline.invoke(Unknown Source) 
    at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 
    at java.lang.reflect.Method.invoke(Unknown Source) 
    at sun.reflect.misc.MethodUtil.invoke(Unknown Source) 
    at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1771) 
    ... 31 more 
Caused by: java.lang.NullPointerException 
    at application.Retailer.<init>(Retailer.java:28) 
    at application.StaffController.showOnClick(StaffController.java:100) 
    ... 41 mor 

E

Answer 1

そのコードとテーブルビュー上のJavaFXチュートリアル以下、How to get clicked rowこれをチェックアウト：

import javafx.application.Application; 
import javafx.beans.property.SimpleStringProperty; 
import javafx.collections.FXCollections; 
import javafx.collections.ObservableList; 
import javafx.geometry.Insets; 
import javafx.scene.Group; 
import javafx.scene.Scene; 
import javafx.scene.control.Label; 
import javafx.scene.control.TableColumn; 
import javafx.scene.control.TableView; 
import javafx.scene.control.TextField; 
import javafx.scene.control.cell.PropertyValueFactory; 
import javafx.scene.layout.VBox; 
import javafx.scene.text.Font; 
import javafx.stage.Stage; 
import javafx.scene.control.TableRow; 
import javafx.scene.input.MouseButton; 


public class textRow extends Application { 

    private TableView<Person> table = new TableView<Person>(); 
    private final ObservableList<Person> data = 
     FXCollections.observableArrayList(
      new Person("Jacob", "Smith", "jacob.smith@example.com"), 
      new Person("Isabella", "Johnson", "isabella.johnson@example.com"), 
      new Person("Ethan", "Williams", "ethan.williams@example.com"), 
      new Person("Emma", "Jones", "emma.jones@example.com"), 
      new Person("Michael", "Brown", "michael.brown@example.com") 
     ); 
    private final TextField rowData= new TextField(); 

    public static void main(String[] args) { 
     launch(args); 
    } 

    @Override 
    public void start(Stage stage) { 
     Scene scene = new Scene(new Group()); 
     stage.setTitle("Table View Sample"); 
     stage.setWidth(450); 
     stage.setHeight(550); 

     final Label label = new Label("Address Book"); 
     label.setFont(new Font("Arial", 20)); 

     table.setEditable(true); 

     TableColumn firstNameCol = new TableColumn("First Name"); 
     firstNameCol.setMinWidth(100); 
     firstNameCol.setCellValueFactory(
       new PropertyValueFactory<Person, String>("firstName")); 

     TableColumn lastNameCol = new TableColumn("Last Name"); 
     lastNameCol.setMinWidth(100); 
     lastNameCol.setCellValueFactory(
       new PropertyValueFactory<Person, String>("lastName")); 

     TableColumn emailCol = new TableColumn("Email"); 
     emailCol.setMinWidth(200); 
     emailCol.setCellValueFactory(
       new PropertyValueFactory<Person, String>("email")); 

     table.setItems(data); 
     table.getColumns().addAll(firstNameCol, lastNameCol, emailCol); 


     table.setRowFactory(tv -> { 
     TableRow<Person> row = new TableRow<>(); 
     row.setOnMouseClicked(event -> { 
      if (! row.isEmpty() && event.getButton()==MouseButton.PRIMARY) { 

       Person clickedRow = row.getItem(); 
       rowData.setText(clickedRow.toString()); 
      } 
     }); 
     return row ; 
}); 

     final VBox vbox = new VBox(); 
     vbox.setSpacing(5); 
     vbox.setPadding(new Insets(10, 0, 0, 10)); 
     vbox.getChildren().addAll(label, table, rowData); 

     ((Group) scene.getRoot()).getChildren().addAll(vbox); 

     stage.setScene(scene); 
     stage.show(); 
    } 

    public static class Person { 

     private final SimpleStringProperty firstName; 
     private final SimpleStringProperty lastName; 
     private final SimpleStringProperty email; 

     private Person(String fName, String lName, String email) { 
      this.firstName = new SimpleStringProperty(fName); 
      this.lastName = new SimpleStringProperty(lName); 
      this.email = new SimpleStringProperty(email); 
     } 

     public String getFirstName() { 
      return firstName.get(); 
     } 

     public void setFirstName(String fName) { 
      firstName.set(fName); 
     } 

     public String getLastName() { 
      return lastName.get(); 
     } 

     public void setLastName(String fName) { 
      lastName.set(fName); 
     } 

     public String getEmail() { 
      return email.get(); 
     } 

     public void setEmail(String fName) { 
      email.set(fName); 
     } 

     public String toString(){ 
      return "Name: "+firstName.get()+" "+lastName.get()+ " Email: "+email.get(); 
     } 
    } 
}