常連

### 前提・実現したいこと

　JavaFXでSchedule表を作っています。
　そこで、TableViewにデータを入れたいと思い、サイトを参考にしてCellクラス、データクラスを作って実装しようとしたところ、NullPointExceptionが起きてしまいました。
　一日粘ってみたのですが、Controllerクラスがどう実行されるか理解出来ていないのもあり、何が原因かわからず、質問させていただきました。よろしくお願いします。

参考にしたサイト:[Cellをカスタマイズ](https://aoe-tk.hatenablog.com/entry/20131206/1386345344)
### 発生している問題・エラーメッセージ

```
java.lang.NullPointerException
	at fxproject/application.ScheduleDataCell.updateItem(ScheduleDataCell.java:50)
	at fxproject/application.ScheduleDataCell.updateItem(ScheduleDataCell.java:1)
	at javafx.controls/javafx.scene.control.TableCell.updateItem(TableCell.java:665)
	at javafx.controls/javafx.scene.control.TableCell.indexChanged(TableCell.java:469)
	at javafx.controls/javafx.scene.control.IndexedCell.updateIndex(IndexedCell.java:120)
	at javafx.controls/javafx.scene.control.skin.TableRowSkinBase.updateCells(TableRowSkinBase.java:539)
	at javafx.controls/javafx.scene.control.skin.TableRowSkinBase.<init>(TableRowSkinBase.java:159)
	at javafx.controls/javafx.scene.control.skin.TableRowSkin.<init>(TableRowSkin.java:89)
	at javafx.controls/javafx.scene.control.TableRow.createDefaultSkin(TableRow.java:213)
	at javafx.controls/javafx.scene.control.Control.doProcessCSS(Control.java:897)
	at javafx.controls/javafx.scene.control.Control.access$000(Control.java:83)
	at javafx.controls/javafx.scene.control.Control$1.doProcessCSS(Control.java:89)
	at javafx.controls/com.sun.javafx.scene.control.ControlHelper.processCSSImpl(ControlHelper.java:67)
	at javafx.graphics/com.sun.javafx.scene.NodeHelper.processCSS(NodeHelper.java:145)
	at javafx.graphics/javafx.scene.Node.processCSS(Node.java:9529)
	at javafx.graphics/javafx.scene.Node.applyCss(Node.java:9616)
	at javafx.controls/javafx.scene.control.skin.VirtualFlow.setCellIndex(VirtualFlow.java:1715)
	at javafx.controls/javafx.scene.control.skin.VirtualFlow.getCell(VirtualFlow.java:1692)
	at javafx.controls/javafx.scene.control.skin.VirtualFlow.getCellLength(VirtualFlow.java:1801)
	at javafx.controls/javafx.scene.control.skin.VirtualFlow.computeViewportOffset(VirtualFlow.java:2639)
	at javafx.controls/javafx.scene.control.skin.VirtualFlow.layoutChildren(VirtualFlow.java:1245)
	at javafx.graphics/javafx.scene.Parent.layout(Parent.java:1204)
	at javafx.graphics/javafx.scene.Parent.layout(Parent.java:1211)
	at javafx.graphics/javafx.scene.Parent.layout(Parent.java:1211)
	at javafx.graphics/javafx.scene.Scene.doLayoutPass(Scene.java:576)
	at javafx.graphics/javafx.scene.Scene.preferredSize(Scene.java:1748)
	at javafx.graphics/javafx.scene.Scene$2.preferredSize(Scene.java:393)
	at javafx.graphics/com.sun.javafx.scene.SceneHelper.preferredSize(SceneHelper.java:66)
	at javafx.graphics/javafx.stage.Window$12.invalidated(Window.java:1086)
	at javafx.base/javafx.beans.property.BooleanPropertyBase.markInvalid(BooleanPropertyBase.java:110)
	at javafx.base/javafx.beans.property.BooleanPropertyBase.set(BooleanPropertyBase.java:145)
	at javafx.graphics/javafx.stage.Window.setShowing(Window.java:1174)
	at javafx.graphics/javafx.stage.Window.show(Window.java:1189)
	at javafx.graphics/javafx.stage.Stage.show(Stage.java:273)
	at fxproject/application.SceduleMain.start(SceduleMain.java:18)
	at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(LauncherImpl.java:846)
	at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$12(PlatformImpl.java:455)
	at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427)
	at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
	at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
	at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174)
	at java.base/java.lang.Thread.run(Thread.java:834)

```

### 該当のソースコード

```ScheduleMain
package application;
	
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Scene;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;


public class SceduleMain extends Application {
	@Override
	public void start(Stage primaryStage) {
		try {
			VBox root = (VBox)FXMLLoader.load(getClass().getResource("ScheduleIndividual.fxml"));
			Scene scene = new Scene(root,100,600);			
			scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
			primaryStage.setScene(scene);
			primaryStage.show();
		} catch(Exception e) {
			e.printStackTrace();
		}
	}
	
	public static void main(String[] args) {
		launch(args);
	}
}

```

```ScheduleData
package application;

import java.time.LocalTime;

import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;

/**
 * ブックマークを表すモデル.
 */
public class ScheduleData {
    private StringProperty title = new SimpleStringProperty();
    private StringProperty time = new SimpleStringProperty();
    private StringProperty detail = new SimpleStringProperty();

    /**
     * コンストラクタ.
     * @param title スケジュールのタイトル
     * @param startTime 開始時間
     * @param finishTime 終了時刻
     * @param detail 詳細
     */
    public ScheduleData(String title,LocalTime startTime, LocalTime finishTime, String detail) {
    	this.title.set(title);    	
    	String time = startTime+"～"+finishTime;
    	this.time.set(time);
        this.detail.set(detail);
    }

    public StringProperty titleProperty() {
        return title;
    }

    public StringProperty timeProperty() {
        return time;
    }

    public StringProperty detailProperty() {
        return detail;
    }
}
```
```ScheduleDataCell
package application;

import javafx.scene.control.TableCell;
import javafx.scene.layout.Priority;
import javafx.scene.layout.VBox;
import javafx.scene.text.Font;
import javafx.scene.text.Text;

public class ScheduleDataCell extends TableCell<String,ScheduleData> {
	   private VBox cellContainer;
	   private Text scheduleTitle;
	   private Text time;
	   private Text txtDetail;
	   private boolean bound = false;
	   
	   public ScheduleDataCell() {
		   initComponent();
	        initStyle();//省略しました。
	   }
	   
	   
	   
	   
	   
	   @Override
	   public void updateItem(ScheduleData scheduleData, boolean empty) {
		   super.updateItem(scheduleData, empty);
		  
	          
		   		   
		   
		   if (empty) {
	            setText(null);
	            setGraphic(null);
	        } else { // タイトルやら詳細やらを設定
	        	scheduleTitle.setText(scheduleData.titleProperty().get());
	            time.setText(scheduleData.timeProperty().get());//→50行目
	            txtDetail.setText(scheduleData.detailProperty().get());
	            setGraphic(cellContainer);
	        }
	   }
}

```
```Controller
package application;

/**
 * Sample Skeleton for 'ScheduleIndividual.fxml' Controller Class
 */

import java.net.URL;
import java.time.LocalTime;
import java.util.ResourceBundle;

import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.TableCell;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.util.Callback;

public class SceduleTableController implements Initializable {
    @FXML // ResourceBundle that was given to the FXMLLoader
    private ResourceBundle resources;

    @FXML // URL location of the FXML file that was given to the FXMLLoader
    private URL location;
    
    @FXML // fx:id="table"
    private TableView<ScheduleData> table; // Value injected by FXMLLoader

    @FXML // fx:id="scheduleColumn"
    private TableColumn<String,ScheduleData> scheduleColumn; // Value injected by FXMLLoader

    @FXML // fx:id="timeColumn"
    private TableColumn<?, ?> timeColumn; // Value injected by FXMLLoader
    

    @Override
	public void initialize(URL location, ResourceBundle resources) {
    	scheduleColumn.setCellFactory(new Callback<TableColumn<String,ScheduleData>, TableCell<String,ScheduleData>>() { // (1)
            @Override
            public TableCell<String,ScheduleData> call(TableColumn<String,ScheduleData> tableColumn) {
                return new ScheduleDataCell();
            }
    	});
    	ObservableList<ScheduleData> scheduleDatas = createScheduleDatas();   	
    	table.setItems(scheduleDatas);
    	
        assert scheduleColumn != null : "fx:id=\"sheduleColumn\" was not injected: check your FXML file 'ScheduleIndividual.fxml'.";
        assert timeColumn != null : "fx:id=\"timColumn\" was not injected: check your FXML file 'ScheduleIndividual.fxml'.";

    }
    
    private ObservableList<ScheduleData> createScheduleDatas(){
    	ObservableList<ScheduleData> scheduleDatas = FXCollections.observableArrayList();
    	
    	ScheduleData data1 = new ScheduleData("部活",LocalTime.of(12,30),LocalTime.of(16,0),"試合");
    	
    	scheduleDatas.add(data1);
    	
    	return scheduleDatas;
    }
}

```
### 試したこと

・scheduleData.titleProperty().get()がNullではないか→Nullではなかった。
・setItemsの第二引数がfaulseになっていないか確認。trueだった。

### 補足情報（FW/ツールのバージョンなど）

jdk:11

	@@ -1,1 +1,1 @@
1	- ~~ScheduleView~~にデータを追加したい
1	+ TableViewにデータを追加したい

	@@ -1,1 +1,1 @@
1	- ScheduleView~~でNullPointExceptionが起き~~た。
1	+ ScheduleViewにデータを追加したい

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